phaser 8500,8550 - service man

8/6/2019 Phaser 8500,8550 - Service Man

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4-36 Phaser 8400/8500/8550 Color Printer

11 Bottom EncounterDistance (uin)

-2500 to-1800

-4250 to -3900

Reports the distance up from theupper limit of travel at which thewiper first encounters the lowertravel limit.

12 TurnaroundRecovery time (sec)

0.001 to0.250

.1 to .25 Reports the time following thestart of the turnaround motionthat the motion drive error return

to normal in the oppositedirection.

Paper Path DriveThis test moves the gear train in one direction while capturing data, does a reversal to capturereversal transient data, then operates in the other direction.

R# Definition

TypicalValue(8400)

TypicalValue(8500/ 8550) Actions

0 Forward Drive PowerLevel (watts)

1.8 to 3.2 Reports the average drive powerlevel in the foreword direction.

1 Up Motion DriveError Ripple (watts)

.3 to 1.3 Reports the average drive ripplelevel in the forward direction.

2 Reverse DrivePower Level (watts)

-3.5 to -2.0

Reports the average power in thereverse direction.

3 Down Motion DriveError Ripple (watts)

0.39 to1.3

Reports the average drive ripplein the forward direction.

4 Swing ArmTransition Time (sec)

.03 to .06 Reports the time that the lowerportion of the paper path drive isdisconnected while the swingarm transitions to the other driveposition.

Wiper Drive (Continued)This test moves the wiper drive mechanism through the complete range of its motion in eachdirection and does an on the fly reversal to verify operability.

R# Definition

TypicalValue(8400)

TypicalValue(8500/

8550) Actions


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General Troubleshooting 4-37

X-Axis DriveThis test drives the X-Axis motor in each directions until the printhead stalls into the stops andthen moves the printhead into the clear and performs an on the fly reversal. The power profile isused to confirm operational goals.

R# Definition

TypicalValue(8400)


0 Right Stall PowerLevel (watts)

5 to 10 .5 to 3.0 Reports the motor/driveelectronics stall power.An abnormal level may indicate amotor/motor drive problem.

1 Left Right Distance(in) 0.32 to0.48 -.15 to .5 Reports the distance betweenthe left and right stall points. Anabnormal value may indicate anproblem that restricts the rangeof motion (pinched cable, etc.).

2 Right Left TraverseAverage PowerLevel (watts)

3.5 to 8.5 .55 to 1.5 Reports the average powerrequired to move the printheadfrom the right hard stop to the lefthard stop. An abnormal value

may indicate a problem with thelead screw or printhead bearings(lubrication, etc.).

3 Right Left TraversePower Ripple (watts)

.20 to 1.8 -.04 to .1 Reports ripple in the power levelneeded to move the printheadfrom the right hard stop to the lefthard stop. An abnormal valuemay indicate a problem withroughness in the drive

mechanism or an interferencewith the printhead motion.

4 Left Right TraversePower AverageLevel (watts)

4.0 to 8.5 .5 to 1.75 Same as R2 except for the otherdirection of motion.

5 Left Right TraversePower Ripple (watts)

1.2 to 1.5 -.01 to.05

Same as R3 except for the otherdirection of. motion.

6 Turnaround PowerBlip Width (watts)

.04 to .11 Reports the width of themomentary drop in the requireddrive power when the printheadmotion is being reversed. Anabnormal value may indicate anunusual amount of play in thedrive mechanism.


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Transfix Drive Slow and Transfix Drive FastWith the drum turning at a constant velocity, the transfix roller is loaded against the drum, held forone revolution, then raised. The velocity with which the transfix roller is moved differs for the twotests.

R# Definition TypicalFast ValueSlow Actions

0 Time to firstcontact (sec)

0.22 to0.29

0.22 to0.50

Reports the time from the load commandto the engine until the drum indicatescontact with the pressure roller.

1 Loadedaverage Y-axis following

error (mpts)

2600 to3400

2600 to3400

Reports the average Y-axis following errorduring the Roll With Transfix Roller Downinterval.

2 Loaded Y-axis followingerror ripple(mpts)

150 to1100

150 to1100

Reports the difference between the maxand min Y-axis following errors during theRoll With Transfix Roller Down interval

3 Time to lastcontact (sec)

-0.001 to0.800

0.30 to0.80

Reports the time from the unloadcommand to the engine until the drumindicates no further contact.


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9 Blade DisengagedTime (sec)

Reports the time from the unloadblade command to the engineuntil the drum indicates nofurther blade contact.

Tilt DriveThis test drives the printhead tilt mechanism through one cycle to determine if it is controllableand operating as expected.

R# Definition

TypicalValue(8400)


0 Tilt Engage CapPosition (min)

10 to 600 100 to450

Reports the distance from thecap Home position to the tilt camengage point.

1 Pre Standby PeakLocation ()

325 to3100

-125 to10

Reports the distance around thetilt cam from the tilt engageposition to the pre standby peak.Should be in degrees, butcurrently units/scaling areunverified.

2 Pre Standby peakMagnitude (pm ticks)

-5100 to-500

-125 to10

Reports the pm motor followingerror at the pre standby peaklocation.

3 Post Wipe PeakLocation ()

1400 to4150

-450 to3.5

Reports the distance around thetilt cam from the tilt engageposition to the post wipe peak.Should be in degrees, butcurrently units/scaling areunverified.

4 Post Wipe peakMagnitude (pm ticks)

-4000 to-75

-130 to25

Reports the pm motor followingerror at the post wipe peaklocation.

Drum Maintenance Drive (Continued)With the Y-axis rotating, the drum maintenance unit is loaded against the drum for a short time ineach configuration (roller and blade/blade only)

R# Definition

TypicalValue(8400)

TypicalValue(8500/

8550) Actions


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Tray 2, Tray 3, Tray 4, Lift Plate DriveThis test raises the lift plate to verify motion and sensor operation. If the test is requested for a525-sheet feeder that is not installed, an Option Not Detected message is generated.

R# Definition

Typical

Value(8400)

Typical

Value(8500/ 8550) Actions

0 Tray Configuration Reports the tray status (present,plate not lifted, etc.). See PaperPath Status test for a descriptionof the configuration encoding.

1 Start Peak Power

(watts)

Reports the highest peak during

the first quarter of the liftinginterval.

2 Slack Take-up Time(sec)

Reports the interval between theinitial power min (when the plateis not yet engaged), and the pointwhere the lifting power becomesa constant.

3 Average Lift Power(watts)

Reports the average power overthe center of the lifting interval.

4 Lift Contact Time(sec)

Reports the interval from themotor start time until the requiredlift power starts to increase dueto the initial contact with thenudger roller assembly.

5 Lift Time (sec) Reports the interval from themotor start time until plate liftedis indicated.

6 Stall Power (watts) Reports the average stall powerduring the overlifting interval


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Check Drum Menu

Y-axis EncoderUses the sine and cosine sum data to determine the characteristics of the encoder disk andencoder sensors.

R# Definition

TypicalValue(8400)


0 Sin Sum DataAmplitude (sin sumunits)

-11000 to350000

Reports difference between themax and min Sin Sum averageamplitude values.

1 Cosine Sum DataAmplitude (cosinesum units)

300000 to500000

Reports difference between themax and min Cosine Sumaverage amplitude values.

2 Sin Sum Data Offset(sin sum units)

150000 to800000

Reports average of the max andmin Sin Sum average amplitudevalues.

3 Cosine Sum DataOffset (cosine sumunits)

90000 to450000

Reports average of the max andmin Cosine Sum averageamplitude values.

4 Home Notch DepthRatio (none)

0 to 13 Reports the ratio between thenotch bottom amplitude and themax amplitude value as reflectedin the Sin Sum data.

5 Home Notch Width(sec)

50 to 90 Reports the width of the Homenotch at 99% full depth asreflected in the Sin Sum data.

6 Home NotchSymmetry (none)

250 to550

Reports the ratio of the Homenotch width sections as bisectedby a vertical from the notch minas reflected in the Sin Sum data.

7 Amplitude Ripple(Sun Sum units)

25 to 75 Reports the ripple in the Sin Sumamplitude values. Excludes theneighborhood of the Home notch(a distance of +/- 50 samples

from the Home notch minlocation.

8 Max Position Ripple(mpts)

-140000to 275000

Reports the max variation in thereported delta position betweensamples over the revolution.


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Y-axis GeometryRotates the drum at a constant velocity and samples the Y-axis position. Uses the data todetermine Y-axis motor and drum vibration and the most significant other vibrational frequencies.

R# Definition

Typical

Value(8400)

Typical


0 Drum NormalizedFFT Power (none)

-3900 to6000

Reports the normalized FFTpower amplitude of the drumfrequency. The normalized valueis generated by dividing the drumFFT power by 1.0xE13.

1 Drum Frequency(hz) 1.25 to7.5 Reports the current drumfrequency.

2 Motor FFT PowerRatio (none)

-200 to250

Reports the ration of the FFTpower amplitude of the motorfrequency to the FFT poweramplitude of the drum frequency.

3 Motor Frequency(hz)

44 to 48 Reports the current motorfrequency.

4 FFT Power Ratio 1(none)

-20000 to25000

Reports the ratio of the FFTpower amplitude of the mostpowerful FFT frequency (notincluding the drum or motor), tothe FFT power amplitude of thedrum frequency.

5 Frequency 1Frequency (hz)

45 to 110 Reports the frequency of themost powerful FFT frequency(not including the drum or motor).

6 FFT Power Ratio 2(none)

--14000to 17000

Reports the ratio of the FFTpower amplitude of the secondmost powerful FFT frequency(not including the drum or motor),to the FFT power amplitude ofthe drum frequency.

7 Frequency 2Frequency (hz)

-70 to140

Reports the frequency of thesecond most powerful FFT

frequency (not including thedrum or motor).


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Y-axis DriveThis procedure performs a 4 corner test using the minimum and maximum velocity andacceleration used during printing and minimum and maximum load for a total of eight test cycles.Measures servo response parameters under various conditions.

R# Definition

TypicalValue(8400)


0 HAHVN CCWAverage Fe (mpts)

4000 to5700

4000 to5700

Reports average following errorduring the last half of the firstperiod.

1 HAHVN CCW Fe

Ripple (mpts)

100 to

380

100 to

300

Reports following error ripple

during the last half of the firstperiod.

2 HAHVN CWAverage Fe (mpts)

-5200 to3800

-5200 to-4000

Reports average following errorduring the last half of the secondperiod.

3 HAHVN CW FeRipple (mpts)

80 to 380 125 to300

Reports following error rippleduring the last half of the secondperiod.

4 HAHVN Start FeSettle time (sec)

0.08 to1.0

.08 to .15 Reports the time following thestart of motion that it takes thefollowing error value to enter theCCW ripple band.

5 HAHVN Reverse FeSettle time (sec)

0.17 to1.1

.12 to .3 Reports the time following thestart of motion reversing that ittakes the following error value toenter the CW ripple band.

6 HAHVN Stop FeSettle time (sec)

-.001 to0.15

-.001 to.30

Reports the time following thestart of motion stopping that ittakes the following error value toenter the idle ripple band.

7 HAHVN Delta PrintVelocity Settle Time(sec)

0.02 to0.10

.075 to

.11Reports the time following thestart of motion that it takes the Y-axis delta velocity to enter theCCW delta velocity ripple band.


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Y-axis Belt SlipThis test does a chase using a special sheet of preprinted media and records the y-axis followingerror.

R# Definition

Typical

Value(8400)

Typical


0 Initial Peak Y-axisFE (mpts)

0 to12000

1200 to8000

Reports the amplitude of the firstY-axis following error peak.

1 Max Following PeakY-axis FE (mpts)

0 to11000

1100 to7500

Reports the amplitude of themaximum Y-axis FE peak afterthe first.

2 Average Y-axis FE(mpts)

0 to 4000 2200 to2900

Reports the average of the Y-axisfollowing error during the rollerdown portion of the transfixoperation.

Y-axis Belt TensionThis test modifies the y-Axis servo loop so that it is unstable and oscillates. The oscillationfrequency is recorded while the drum is advanced for two revolutions. Checks for correct belttension and for variations in tension during operation.

R# Definition

TypicalValue(8400)


0 Min ResonantFrequency (hz)

10 to 150 4.5 to 175 Reports the min resonantfrequency over the data set.

1 Max ResonantFrequency (hz)

175 to3000

-4400 to10000

Reports the max resonantfrequency over the data set.

2 Min ResonantFrequency Revs(revs)

Reports the number of full Y-axisrevs required to locate the minfrequency configuration.

3 Min Resonant

Frequency Angle(deg)

-0.001 to

-0.2

-33 to -20 Reports the amount of additional

Y-axis rotation required to locatethe min frequency configuration.


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Stripper ContactThis test holds the drum stationary while the stripper solenoid is activated and released. Thedrum servo error signal illustrates activation/deactivation timing and how strongly the drum wascontacted by the blade.

R# Definition

TypicalValue(8400)


0 EngageDisplacement (mpts)

-10 to 2 -9.0 to8.0

Reports the static differencebetween the average ya_febefore and after the bladecontacts the drum, indicating howstrongly the blade is interactingwith the drum while pushing ontothe drum.May be an indication as to thecondition of the blade (stiffness,dirty, bent, delaminated, etc.).Another potential factor could bethe solenoid range of travel orengagement force (solenoid/ solenoid drive strength or returnspring strength).

1 Engage Time (sec) .0030 to.0035

.002 to

.04Reports time betweenengagement of the strippersolenoid and initial contactbetween the blade and the drum.May indicate the geometry of themechanism, such as parts out oftolerance, mis-assembled, orbent, causing an incorrect bladeto drum gap.

2 Engaging Period(sec)

0 to 0.11 .09 to .25 Reports time between strippersolenoid engagement and thepoint when the reaction of thedrum to the contact of the bladefades back into the ripple (noise).Another indication of blade todrum interaction. The profileshape (R2/R2) could be adynamic indication of the blade/

drum interaction as is the staticvalue reported by R0.

3 Engaging Amplitude(mpts)

3 to 18 5.0 to 35 Reports the magnitude of thereaction of the drum to thecontact of the blade. (See R2)


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4 ReleaseDisplacement (mpts)

-0.75 to2.2

-2.0 to1.25

Reports the static differencebetween the average ya_febefore and after the bladedisengages from the drum,indicating the strength of theblade/drum interaction whilepulling off the drum (see R0).

5 Release Time (sec) 0 to 0.09 .002 to.009

Reports the time between thedisengagement of the stripper soland the point when the bladebegins to withdraw from the drum(see R2).

6 Releasing Period(sec)

0 to .001 .02 to .3 Reports the time between thedisengagement of the stripper soland the point when the reactionof the drum to the withdrawal ofthe blade fades back into theripple (see R2).

7 Releasing Amplitude(mpts)

-45 to 0 -10 to 5.5 Reports the magnitude of thereaction of the drum to the bladewithdrawal (see R3).

Drum Maintenance ContactThis test uses the drum servo error signal to indicate when the drum is contacted by the rollerblade.

R# Definition

TypicalValue(8400)


0 Initial ContactPosition (pm motorcounts)

Reports the distance the pmmotor was moved (raising the dmunit), before a Y-axis reaction wasdetected. Shows that the dm israising, provides blade/drum gapinformation.

Stripper Contact (Continued)This test holds the drum stationary while the stripper solenoid is activated and released. Thedrum servo error signal illustrates activation/deactivation timing and how strongly the drum wascontacted by the blade.

R# Definition

TypicalValue

(8400)

TypicalValue

(8500/ 8550) Actions


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Check Motors Menu

Y-Axis MotorThis test turns on the Y-axis motor and runs it very slowly for one revolution.

R# Definition

TypicalValue(8400)


0 Motor fe ripple(ticks)

0.08 to0.60

.07 to .7 Reports amount of variation ofthe motor following error over therecording interval.

1 Motor fe average(ticks) 0.5 to 0.7 .5 to .8 Reports the motor following erroraverage value of the recordinginterval.

2 Motor drive voltageripple (volts)

0.34 to1.3

.3 to 1.5 Reports amount of variation ofthe motor drive voltage over therecording interval.

3 Motor drive voltage(volts)

-1.4 to-0.8

-1.6 to -.8 Reports average value of motordrive voltage over the recordinginterval.

4 Motor drive powerripple (watts).

0.25 to1.8

1.3 to 2.5 Reports variation of motor drivepower over the recording interval.

5 Motor drive poweraverage (watts)

1.25 to2.6

.06 to .13 Reports average value of motordrive power over the recordinginterval.

X-Axis MotorThis test turns on the X-axis motor and runs it very slowly for one revolution.

R# Definition

TypicalValue(8400)


0 Motor Voltage ARipple (volts).

84 to 86 59 to 62 Reports amount of variation ofthe motor phase A drive voltageover the recording interval.

1 Motor Voltage AAverage (volts)

-0.120 to0.13

.10 to .05 Reports the motor phase A drivevoltage average value over therecording interval.


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2 Motor Voltage BRipple (volts)

84 to 86 59 to 62 Reports amount of variation ofthe motor phase B drive voltageover the recording interval.

3 Motor Voltage BAverage (volts)

-.012 to0.1

.04 to .11 Reports the motor phase B drivevoltage average value over therecording interval.

4 Motor Drive PowerRipple (watts)

0.5 to 2.0 .1 to .5 Reports amount of variation ofthe motor drive power over therecording interval.

5 Motor Drive PowerAverage (watts)

9 to 13 5.5 to 7.5 Reports the motor drive poweraverage value of the recordinginterval.

Process MotorThis test turns on the process motor and runs it very slowly for one revolution.

R# Definition

TypicalValue(8400)



2.8 to 6.0 0 to .02 Reports amount of variation ofthe motor following error over the

recording interval.1 Motor fe average

(ticks)-4 to 3.0 .015 to

.01Reports the motor following erroraverage value of the recordinginterval.


5 to 11 8 to 11 Reports amount of variation ofthe motor drive voltage over therecording interval.


1.3 to 2.3 .9 to 1.5 Reports the motor drive voltageaverage value of the recordinginterval.

4 Motor drive powerripple (watts)

1.03 to3.6

.7 to 2.0 Reports amount of variation ofthe motor drive power over therecording interval.

X-Axis MotorThis test turns on the X-axis motor and runs it very slowly for one revolution.

R# Definition

TypicalValue(8400)



186/397



1.5 to 3.5 1.2 to2.75

Reports the motor drive poweraverage value of the recordinginterval.

Media Path MotorThis test turns on the media path motor and runs it very slowly for one revolution.

R# Definition

TypicalValue(8400)



.40 to 1.3 .001 to.0035

Reports amount of variation ofthe motor following error over therecording interval.

1 Motor fe average(ticks)

0.8 to 2.0 .0033 to.007

Reports the motor following erroraverage value of the recordinginterval.


4 to 10 4 to 8 Reports amount of variation ofthe motor drive voltage over therecording interval.


-5.5 to -2.0

-5 to -2.0 Reports the motor drive voltageaverage value of the recording

interval.4 Motor drive power

ripple (watts)0.8 to 6 .8 to 3.9 Reports amount of variation of

the motor drive power over therecording interval.


1.9 to 7 2 to 8 Reports the motor drive poweraverage value of the recordinginterval.

Process MotorThis test turns on the process motor and runs it very slowly for one revolution.

R# Definition

TypicalValue(8400)



187/397


Tray 2, Tray 3, Tray 4, Lift Motorhis test turns on the specified motor and runs it at constant velocity for approximately 20revolutions while recording drive data. The test is the same for each motor. Requesting a test fora 525-sheet feeder that is not installed will generate an Option Not Detected message.

R# Definition

TypicalValue(8400)


0 Motor Peak Power(watts)

1 to 2.5 Reports max amount of motorpower over the run interval.

1 Motor AveragePower (watts)

.25 to .55 Reports the average motor drivepower over the last half of the run

interval.

2 Brake AveragePower (watts)

.10 to .20 Reports the average motor brakepower over the stop with brakeinterval.

Tray 3 and Tray 4 Pick/Feed MotorThis test turns on the specified motor and runs it at constant velocity for approximately 25revolutions while recording drive data. The test is the same for each motor. Requesting a test fora 525-sheet feeder that is not installed will generate an Option Not Detected message.

R# Definition

TypicalValue(8400)



Reports amount of variation ofthe motor following error over therecording interval.

1 Motor fe average(ticks)

Reports the motor following erroraverage value of the recordinginterval.


Reports amount of variation ofthe motor drive voltage over therecording interval.


Reports the motor drive voltageaverage value of the recordinginterval.

4 Motor drive powerripple (watts)

Reports amount of variation ofthe motor drive power over therecording interval.


188/397



Reports motor drive poweraverage value over the recordinginterval.

Tray 3 and Tray 4 Pick/Feed Motor (Continued)This test turns on the specified motor and runs it at constant velocity for approximately 25revolutions while recording drive data. The test is the same for each motor. Requesting a test fora 525-sheet feeder that is not installed will generate an Option Not Detected message.

R# Definition

TypicalValue

(8400)

TypicalValue

(8500/ 8550) Actions


189/397


Check Misc Menu

Paper Path StatusThis test looks at the paper path sensors to identify if anything would prevent a page fromprinting. The Control Panel will display messages indicating if anything unexpected is found for:R0 = upper paper path; R1 = tray 1; R2 = tray 2; R3 = tray 3; and R4 = tray 4. The display is astring of 0s and 1s (one digit for each sensor state) and is listed below from most significant bit toleast significant bit.1 = an item that needs to be corrected.0 = normal

R# Definition

TypicalValue(8400)

TypicalValue(8500/

8550) Actions

0 Upper Paper Path 6 -31 Not used, always 0

0 5 - Front door open

0 4 - Top door open

0 3 - Paper at deskew sensor

0 2 - Paper at preheat exit sensor

0 1 - Paper at strip sensor

0 0 - Paper at exit sensor

1 Tray 1 14 - 31 unused, always 0

1 13 - No media present

1 0 - 12 width value

2, 3,4

Tray 2, Tray 3 andTray 4

9 - 31 unused

2, 3,4

8 - No tray

2, 3,4

7 - No paper

2, 3,4

6 - plate not lifted

2, 3,4

5 - Paper at tray pick sensor

2, 3,4

4 - media length top


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2, 3,4

3 - media length bottom

2, 3,4 2 - Media width top

2, 3,4

1 - media width middle

2, 3,4

0 - Media width bottom

Temperature StatusThis test scans the thermocouples and reports data on the current temperature with the goal ofproviding a picture of the current temperature state of the printer. All degrees are reported incelsius.

R# Definition

TypicalValue(8400)


0 Reservoir Temp ~127.7 o ~135.0 o Reports the current temperature

1 Left Jetstack ~134 o ~138 o Reports the current temperature

2 Right Jetstack ~134 o ~138 o Reports the current temperature

3 Preheater Temp ~62 o ~70 Reports the current temperature

4 Drum Temp ~60o

~60o

Reports the current temperature

5 Ink Melt 1 Temp ~50 o ~50 o Yellow (usually off)

6 Ink Melt 2 Temp ~50 o ~50 o Cyan (usually off)

7 Ink Melt 3 Temp ~50 o ~50 o Magenta (usually off)

Paper Path Status (Continued)This test looks at the paper path sensors to identify if anything would prevent a page fromprinting. The Control Panel will display messages indicating if anything unexpected is found for:R0 = upper paper path; R1 = tray 1; R2 = tray 2; R3 = tray 3; and R4 = tray 4. The display is astring of 0s and 1s (one digit for each sensor state) and is listed below from most significant bit toleast significant bit.1 = an item that needs to be corrected.0 = normal

R# Definition

TypicalValue(8400)



191/397


8 Ink Melt 4 Temp ~50 o ~50 o Black (usually off)

Purge PumpThis test determines if the purge pump system (pump/hose/purge valve/printhead) is operating

normally.

R# Definition

TypicalValue(8400)


0 JetstackTemperature (deg)

~134 o ~138 o Reports current jetstacktemperature. If the temperature isabove current threshold (120deg), the test will abort andfollowing results will report as 0.This avoids having ink extrudeout of the faceplate and onto thedrum, requiring both a wipe and achase to clean up.

1 Start Power (watts) Reports initial peak pumpingpower after pump power on. Thisreflects the inrush current to thepump motor. An unusual valuecould indicate a defective motor(windings/brushes/etc.).

2 Initial PumpingPower (watts)

Reports minimum pumpingpower after start up peak (R1).This is the first value to reflect thesystem pressure. If the volume isnormal (hose/printhead), then thedrop is large and the pressurerises slowly. If the volume is small(hose pinched plugged near thepump), then the drop is minimaland the pressure rises quickly

Temperature Status (Continued)This test scans the thermocouples and reports data on the current temperature with the goal ofproviding a picture of the current temperature state of the printer. All degrees are reported incelsius.

R# Definition

TypicalValue

(8400)

TypicalValue

(8500/ 8550) Actions


192/397


3 Max PressurePumping Power

Reports average pumping power just before maximum pressure isreached. May indicate theefficiency of the pump, leaks,and/or the setting of the pressurerelief valve.

4 Pumping Time To

Max (sec)

Reports the time from pump on

until the pressure relief valveopens. May indicate theconditions discussed in R3, aswell as the system volume.

5 No PressurePumping Power(watts)

Reports the average pumpingpower after the pressure has fullydecayed. May indicate pumpmotor condition/efficiency.

6 Pressure DecayTime (sec)

Reports the time between purgevalve opening and the point whenthe pumping power (relative tothe current pressure), fades backinto the ripple of the no pressurepumping power (see the R5discussion above). This timecould indicate the operation ofthe purge valve and the conditionof the bleed orifice (plugged,etc.).

VoltagesThis test determines averaged readings for key system voltages.

R# Definition

TypicalValue

(8400)

TypicalValue

(8500/ 8550) Actions

Main Board Voltages

0 5 Volts (volts) ~5V ~5V

1 1.8 Volts (volts) ~1.8V ~1.8V

Purge Pump (Continued)This test determines if the purge pump system (pump/hose/purge valve/printhead) is operatingnormally.

R# Definition

TypicalValue(8400)

TypicalValue(8500/

8550) Actions


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2 2.5 Volts (volts) ~2.5V ~2.5V

3 3.3 Volts (volts) +/-2.5% +/-2.5%

4 unregulated12 Volts(volts)

+/- 20% +/- 20%

5 2.5 Volts (volts) ~ 2.5 ~ 2.5

6 unregulated

Negative 12 Volts(volts)

+/- 20% +/- 20%

Control Board Voltages

7 DC Power (watts)

8 50 Volts 47 to 52 47 to 52

9 Negative 50 Volts -47 to 52 -47 to 52

10 UnregulatedNegative 15 Volts

-11 to -16.5

-11 to -16.5

11 Unregulated 15 Volts 11 to 17 11 to 17

12 AC Volts 120 Volts 90 to 140 90 to 140

AC Volts 240 Volts 180 to275

180 to275

Wiper Alignment

R# Definition

TypicalValue(8400)


0 The engage wiperposition (min)

Reports the distance from wipehome to the tilt engage position.

1 Upper hard stopwiper position (min)

Reports the distance from wipeto home to the upper hard stop.

Voltages (Continued)This test determines averaged readings for key system voltages.

R# Definition

TypicalValue(8400)



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Drum Maint/Transfix HomeThis test drives the process motor a short distance in each direction to verify that the dmfix driveunit was in its home position.

R# Definition

Typical

Value(8400)

Typical


0 DM Initial FE Peak(pm motor counts)

Reports the height of the initialpeak when starting rotation of thedm drive gear.

1 DM Initial FE PeakTime (sec)

Reports the time since the startof CCW motion until the peakwas detected.

2 TF Initial FE Peak(pm motor counts)

Reports the height of the initialpeak when starting rotation of thetf drive gear.

3 TF Initial FE PeakTime (sec)

Reports the time since the startof CW motion until the peak wasdetected.


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Electronics Troubleshooting

Printer Power-Up SequenceThe following lists the chain of events that occur when you turn on a printer. You can

follow this list as one means of determining if the printer is operating correctly. Theexact chain of events depends upon the last power down condition and where theprinter has last determined the printhead is positioned, this is stored in non-volatileRAM. The Electronics Troubleshooting Checklist is the primary reference fortroubleshooting power-up problems.

1. Power cord is plugged in and the power switch is turned on:

2. Power supply senses AC line voltage conditions (110 VAC or 220 VAC) andenables DC voltages. If an overload occurs, the printer turns off the high voltageDC supplies, causing a blink effect on the Control Panel LEDs.

3. BIST test flashes the PE LED very briefly at a fast rate until the end of the nexttest.

4. The Boot loader performs CPU initialization and RAM test. It then sends theboot loader version to the serial port.

5. Power-On Self Test (POST) initializes the Control Panel. The Control Panel LEDturns red, green, orange, and then off. The Control Panel LCD then goes black and then clear. The POST version displays on the LCD and waits two seconds.During this time the operator can press the Back button to bypass the remainingPOST test.

6. Low level Power-On Self Test (POST) diagnostics are performed. The ControlPanel displays status messages as each sub-test is performed. This test takesabout 8 seconds. All LEDs are off during the test.

If POST diagnostics pass, the Control Panel displays the Xerox logo and turns onthe green LED.

If the test detects an error, the error message displays on the LCD and the printerflashes the LEDs with a repeating error code pattern.

7. The VxWorks operating system is initialized and engine code is started. Thistakes about 15 seconds. The Xerox logo is displayed.

8. Print Engine Self Test (PEST) diagnostics are then performed. These test theheaters, clutches, motors and solenoids. As each clutch is tested, you hearclicking with four high tones as each motor is tested. This test takes about 30seconds.

9. The printer now runs the mechanical initialization. The exact sequence dependson the initial position of the printhead and wiper assembly.


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Mechanical Initialization (8400)

S t a r t t h e

T h e r m a l s

1 3

, x x x

U n b

i n d M e d

i a

P a t

h M o t o r a n

d

H o m e t h e

M P T

3 1

, 0 0 0

H o m e t h e

Y - A x i s

5 0 0 1

, 5

0 0 4

W a i t f o r t h e

H e a

d

t o r e a d

O K

_ T O

_ W I P E

T e m p e r a t u r e s

1 3

. x x x

H o m e

X A

6 0 0 0

M o v e

X A t o

H E A D T I L T

P O S I T I O N

6 0 0 0

S t a r t

M e c

h a n i c a

l

R e c o v e r y

S e t

F I R M W A R E s t a t e s :

C a p

S t a t e =

U N K N O W N

H e a

d T i l t S t a t e =

U N K N O W N

D m f i x

S t a t e =

U N K N O W N

Y a S t a t e =

H O M E L E S S

X a

S t a t e =

H O M E L E S S

I s t h e

h e a d t i l t

C a m e n g a g e

d

( h e a

d t i l t e

d ? )

H o m e t h e

C A P / w i p e r

w i t h o u t d

i s e n g a g i n g t h e

H e a

d T i l t C a m

8 0 0 5

, 8 0 0 7

, 8 0 0 8 , 8 0 0 9

Y E S

N O

V a l u e s

i n t h e

N V R A M a r e u s e d t o

d e t e r m

i n e

i f p r

i n t h e a

d a n

d w

i p e r

h a v e

c o n t a c t o r

i f t h e

h e a d w a s p a r k e

d o n

l a s t p o w e r

d o w n .

I f p r

i n t h e a

d a n d w

i p e r

a r e

i n c o n t a c t , t h e p r

i n t h e a

d w a r m s

f i r s t

b e f o r e m o v

i n g .

I f t h e p r

i n t h e a

d

w a s p a r k e d

, t h e p r

i n t h e a

d i s w a r m

b e f o r e m o v

i n g t o t h e p r

i n t p o s i t i o n .

T h e

d a s h e

d l i n e t r a c e s w

h a t h a p p e n s

i f t h e p r i n t h e a

d w a s p a r k e

d o n

l a s t

p o w e r

d o w n

.

T h e

R E D n u m

b e r s

i n d i c a t e e r r o r s t h a t

m a y

b e

d i s p

l a y e

d a t t h a t p o

i n t i n t h e

m e c h

i n i t p r o c e s s

.

M e c

h a n i c a

l R e c o v e r y

P O W E R O N

s 8 5

0 0

- 0 2 9


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_ h e a d P a r k e d

O n ?

L a s t P o w e r D o w n ?

M o v e

C a p / W i p e r

t o t h e P a r k

A R M

S - a

n d r e s t r a i n

h e a d a g a i n .

8 0 3 5

, 7 0 0 9

H o m e D m f i x

7 0 0 2

J o g t h e X

A x i s i n

o r d e r t o

r e l e a s e t h e

H e a d T i l t

A r m s .

M o v e H e a d t o t h e

P A R K p o s i t i o n ,

7 0 0 7

, 7 0 0 8

, 8 0 0 5

, 8 0 5 5 , 8 0 0 7

,

7 0 0 6

, 8 0 0 8

, 8 0 0 9

, 7 0 1 4

I f n o t i n n o n - t h e r m a l s

O i l D r u m 4 t i m e s

D O N E

D i d t h e

P r o c e s s M o t o r

D e v i s e F a u l t ?


S t a n d b y p o s i t i o n

.

7 0 0 7

, 7 0 0 8

, 8 0 0 5

, 8 0 5 5

, 8 0 0 7

,

7 0 0 6

, 8 0 0 8

, 8 0 0 9

M o v e X A t o L e f t

S i d e H a r d

S t o p

6 0 0 0

M o v e X A t o T i l t

P o s i t i o n

6 0 0 0


H o m e / P r i n t

p o s i t i o n

7 0 1 0

, 7 0 0 6

S t a r t Y A

S l e w

5 0 0 3

R e h o m e X A

6 0 0 0

R E C

O V E R Y R

O U T I N E

T r y t o r e c o v e r

f r o m

P r o c e s s

M o t o r

S t a

l l H o m e X A

6 0 0 0

M o v e X A t o L e f t

S i d e H a r d

S t o p

6 0 0 0

M o v e X A t o T i l t

P o s i t i o n

6 0 0 0

h o m e D m f i x

a g a i n

4 0 2 5

W a r m u p w i l l b e r e s p o n s i b l e f o r

m o v i n g t h e h e a d t o t h e p r i n t p o s i t i o n

a f t e r t h e w i p e a n d p u r g e a r e

p e r f o r m e d

.

N O

Y E S

Y E S

Y E S

N O

N O

D e v i c e F a u l t

C o d e s

8 0 x x -

W i p e r

7 0 0 2 -

P M s t a l l e d

7 0 x x -

H e a d t i l t

7 0 1 4 -

H e a d N o t R e s t r a i n e d

3 1 0 0 1 -

M e d i a P a t h

5 0 0 1 -

Y A H o m e T i m e r

5 0 0 2 -

Y A E n c o d e r ( S t a l l )

6 0 0 0 -

X A E r r o r

4 0 2 5 -

P M I n i t F a i l e d

( h o m e D m f i x )

4 0 2 4 -

W i p e r A l i g n m e n t F a i l e d

8 0 2 1 -

P u m p U n i n i t i a l i z e d

O t h e r s

. . . . .

- T h e r m a l F a u l t s

,

E C M F a u l t s

, H C

, P M F a u l t s

o i l i n g d r u m

J o g t h e X

A x i s i n

o r d e r t o

r e l e a s e t h e

H e a d T i l t

A r m s .

s 8 5 0 0 - 0 3 0


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Mechanical Initialization (8500/8550)

H o m e

X A a n

d m o v e

X A t o t h e

H E A D T I L T p o s i t i o n

6 0 0 0

U s e t h e

H e a

d t i l t

S o l e n o i

d a n

d t i l t t

h e

h e a d t o

S t a n d

b y

7 0 0 7

, 7 0 0 6 , 7 0

0 8 , 8

0 0 5 ,

8 0 5 5

, 8 0 0 7 ,

8 0 0 8

, 8 0 0 9

I s t h e

h e a

d t i l t C

A M

e n g a g e

d

( h e a

d t i l t e

d ? )

M o v e t h e w

i p e r a n

d t h e

h e a d t o

d e t e r m

i n e

i f

t h e

h e a d

i s f u

l l y r e s t r a

i n e d o r n o t .

T h i s w

i l l

a l l o w t h e

h e a d t o t i l t t o t h e s t a n

d b y p o s i t i o n s o

t h e w

i p e r c a n

b e h o m e d

.

7 0 0 7 , 7 0

0 6

H o m e t h e

C A P / w i p e r

w i t h o u t d

i s e n g a g i n g t h e

H e a

d T i l t C A M

8 0 0 5

,

8 0 0 7

, 8 0 0 8 , 8 0 0 9

E n g a g e t h e

H e a

d t i l t

S o l e n o i

d

M E C H A N I C A L R E C O V E R Y

S t a r t

M e c

h a n i c a

l

R e c o v e r y

S t a r t t h e

t h e r m a l s .

1 3 , x

x x

C l o s e p r e h e a t e r

S e t

F I R M W A R E s t a t e s :

C a p

S t a t e =

U N K N O W N

H e a

d T i l t S t a t e =

U N K N O W N

D m f i x

S t a t e =

U N K N O W N

Y a S t a t e =

H O M E L E S S

M e c

h a n i c a

l R e c o v e r y

P O W E R O N

U n b

i n d M e d

i a

P a t

h M o t o r a n

d

H O M E t h e

M P T

3 1 , 0

0 1

H o m e t h e

Y - A x i s

5 0 0 1

, 5 0 0 4

W a i t f o r

h e a d t o r e a d

O K

_ T O

_ W I P E

t e m p e r a t u r e s

1 3 , x

x x

s 8 5

0 0

- 1 3 7

N o

V a l u e s

i n N V R A M a r e u s e d t o

d e t e r m

i n e

i f

p r i n t

h e a d a n

d w

i p e r

h a v e c o n t a c t o r

i f t h e

p r i n t

h e a d w a s p a r k e d o n

l a s t p o w e r

d o w n .

I f

p r i n t

h e a d a n

d w

i p e r a r e

i n c o n t a c t , t h e p r

i n t h e a

d

w

a r m s f i r s t

b e f o r e m o v

i n g t h e w

i p e r

.

T h e B L U E l i n e t r a c e s w

h a t h a p p e n s

i f p r

i n t h e a

d

w

a s p a r k e d o n

l a s t p o w e r

d o w n .

N

O T E : H e a

d t i l t C A M w

i l l b e e n g a g e

d w

h e n t h e

p r i n t

h e a d

i s i n t h e

P A R K E D ( r e s t r a i n e

d ) p o s i t i o n .

T h e R E D n u m

b e r s

i n d i c a t e e r r o r s t h a t m a y

b e

d i s p l a y e d a t t h a t p o

i n t

i n t h e p r o c e s s .

Y e s


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N o

H o m e

X A

6 0 0 0

D i d

t h e

P r o c e s s

M o t o r

D e v

i c e

F a u l t ?

M o v e

X A t o

L e f t

S i d e

H a r

d S t o p

6 0 0 0

M o v e

X A t o

T i l t

P o s

i t i o n

6 0 0 0

h o m e D m f i x

a g a i n

4 0 2 5

M o v e

X A t o

L e f t

S i d e

H a r

d S t o p

6 0 0 0

M o v e

X A t o

T i l t p o s i t i o n

6 0 0 0

M o v e

H e a

d t o t h e

S t a n d

b y p o s i t i o n ,

7 0 0 7

, 7 0 0 6 , 7 0

0 8 , 8

0 0 5 ,

8 0 5 5

, 8 0 0 7 ,

8 0 0 8

, 8 0 0 9

M o v e

H e a

d t o t h e

H o m e /

P r i n t p o s i t i o n

7 0 0 6

, 7 0 1 0

S t a r t

Y A S L E W

5 0 0 4

D O N E

J o g t h e

X

A x i s i n

o r d e r t o

r e l e a s e t h e

H e a

d T i l t

A r m s .

R e h o m e

X A

6 0 0 0

R E C O V E R Y R O U T I N E

D e v

i c e

F a u l t C o d e s

8 0 x x -

W i p e r

8 0 2 1

- P u m p

N o t

I n i t e d

7 0 0 9

- W i p e r

A l i g n m e n t

7 0 0 2

- P M s t a l

l e d

7 0 x x -

H e a

d t i l t

7 0 0 6

- H e a

d t i l t S o l e n o i

d

7 0 1 4

- H e a

d N o t

R e s t r a i n e

d

3 1 0 0 1

- M e d

i a P a t

h

5 0 0 1

- Y a H o m e

T i m e r

5 0 0 4 Y A

- G e n e r a l

M o t

i o n

E r r o r

6 0 0 0

- X A E r r o r

4 0 2 5 -

P M I n i t F a i l e d ( h o m e D m f i x

)

4 0 2 4

- W i p e r

A l i g n m e n t

F a i l e d

O t h e r s .

. . -

T h e r m a l f a u l t s

, E C M

F a u l t s

, H C

, P M f a u l t s o i

l i n g

d r u m

_ h e a

d P a r

k e d O n

L a s t

P o w e r

D o w n ?

h o m e

D m f i x

7 0 0 2

M o v e H e a

d t o t h e

P A R K p o s i t i o n ,

7 0 0 7

, 7 0 0 8

, 8 0 0 5 ,

8 0 5 5

,

8 0 0 7

, 8 0 0 8 , 8 0 0 9

, 7 0 1 4

A f t e r t h e p r

i n t e r

i s w a r m

,

t h e

h e a d w

i l l t i l t t o t

h e

p r i n t p o s

i t i o n a n d

O i l D r u m

4 t i m e s

M o v e

C a p

/ W i p e r t o t h e

P A R K

A R M S

- a n

d r e s t r a

i n h e a d

a g a i n .

8 0 3 5

, 7 0 0 9

s 8 5

0 0

- 1 3 8

J o g t h e

X

A x i s

i n o r

d e r

t o

r e l e a s e t h e

H e a

d T i l t

A r m s .

T r y t o r e c o v e r f r o m

P r o c e s s

M o t o r

S t a

l l

Y e s

N o

Y e s

N o

Y e s

W a r m u p w

i l l b e r e s p o n s i

b l e f o r m o v

i n g

t h e

h e a d t o t h e p r

i n t p o s

i t i o n a f t e r t h e

w i p e a n

d p u r g e a r e p e r f o r m e d

.


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If the printer was not shutdown by the power switch the last time itwas turned off or it was shutdown with ink on the drum:

1. As soon as the printer has warmed up, the media path motor moves the wiper tothe bottom of its travel and the process motor moves the printhead to the printposition a chase page is sent through the paper path to clean ink from the drum.

If printhead, ink reservoirs, or jetstack temperature are below purgethreshold, the printer performs a head clean cycle.

1. The printer waits for the printhead to reach its purge temperature.

2. The printer moves the wiper to the bottom of its travel and tilts the printheadforward to its print position to check the ink levels. If the ink level is low, ink ismelted into the appropriated reservoirs.

3. The printhead tilts to the standby position and moves the wiper assembly to thepurge position in front of the printhead faceplate.

4. The purge pump begins the pressure purge after about 2 seconds the purge pumpsolenoid opens.

5. The printhead tilts forward against the wiper assembly (wipe position) and thepurge and wipe cycle begins.

6. The Control Panel indicates the printer is performing the cleaning process.

7. The printhead is moved left to the tilt zone, where the printhead can tilt back

without interference, and the media path motor moves the wiper to the bottom of its travel to engage the printhead tilt cam. The process motor rotates the printheadtilt gears, which tilt in order to move the printhead to the forward print position.

8. After the print engine is in a known, valid state the Control Panel display showsthe warm-up progress (the Ready LED flashes). When warm-up completes, theReady LED displays solid.

9. The temperature of the printhead, drum and paper preheater are allowed tostabilize at their operating temperatures and ink is melted if needed.

10. The printhead is homed to the print position for printing.

11. A cleaning page is printed at this time, if a purge was performed.

12. A start page is printed (if enabled).

13. The Control Panel displays a message that the printer is initializing and thenready.

14. The print engine is initialized and is ready to print.


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Miscellaneous Electrical TroubleshootingThe electronics module contains the Power Supply, Image Processor board and thePower Control board. If a component of the electronics module fails, and service isnecessary, the entire electronics module is replaced as a unit. No individual boardtroubleshooting is required. The printer contains many self test routines to aid in

diagnosing problems.

NoteIf the printer encounters certain fault conditions, the printer may reboot up tothree times before displaying an error code. This is an attempt to correct theproblem and reduce the number of unnecessary service calls.

Following the suggested debug procedures, the specified sequence generally providesbetter test coverage than performing tests in a different order.

Error Message Displayed on Control Panel LCD

Printer has detected a fault condition.

1. See "Fault Code Error Message Troubleshooting" on page 3-8 for definitions andsolutions.

LCD Is Blank and the PS and PE Indicators Are Flashing an Error Code

Printer has detected a fault condition but can't display a message on the LCD.Some portion of the chain of devices used to drive the LCD may be defectivesince an error message is not displayed.

1. See "Fault Code Error Message Troubleshooting" on page 3-8 for definitions andsolutions.

Printer Fails to Power-Up: PS, PE and the 3.3 V Indicator LEDs Are NotIlluminated

1. Printer is not receiving proper AC.

NoteUse caution with hazardous voltages when diagnosing AC problems. The3.3 V LED is located INSIDE the electronics module and must be observedthrough the vent holes close to the AC power switch, see the illustration on

page 4-75 .

a. Inspect the power cord.b. Verify AC outlet voltage and current capacities are within specifications.c. If necessary, move the printer to a different outlet and retest.


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d. Plug in the Power Control to I/O board connector (J800). This step adds theI/O board back to the working electronics module - nothing else isconnected.

e. Turn on power to the printer

5. If the PE and PS indicators do not flash momentarily, the short is on the I/O boardor related cabling. Skip the rest of this section if the PE and PS indicators flashbecause the problem is elsewhere in the printer.

a. Verify short is on the I/O board by using an ohmmeter to check the resistanceon J270, pin 1 to ground. Resistance of less than 1K ohm indicates aproblem.

b. To isolate problem to I/O board or related cabling, unplug I/O boardconnectors:

Umbilical Right J1 Waste Tray Sense J110

Stripper Solenoid J250 Paper Tray Sense J610 Front Door Sense J600 Inkload Signal J910 DMU Sense J860 Drum Thermistor J870 Exit Module J680 Heater Relay Control J950c. Retest the resistance of the I/O board. If the resistance is still less than

1K ohm, replace the I/O board, reinstall all cables and retest printer.d. If the I/O board resistance is OK, plug in the I/O board connectors one at a

time and retest the resistance.e. Plug in all cables removed during service.f. Trace through all service steps performed to reattach any cables that were

unplugged during debugging.g. Attach printer covers.h. Perform full test of printer.

6. Short circuit on 3.3 V power supply within the Control Panel.

a. REQUIRED : Follow all procedures from Step 3 and Step 4 beforeproceeding.

b. With power cord connected, touch the metal electronics module to dischargeany static electricity.

c. Turn off printer and wait 30 seconds for power supply capacitors todischarge. Damage to circuits within the electronics module may occur if thepower supply capacitors are not allowed to fully discharge.

d. Plug in the Control Panel connector J220 on the I/O board. This step adds theControl Panel back to a working electronics module and I/O board in orderto see if the short circuit is also removed.

e. Turn on power to the printer.


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f. If the PE and PS indicators do not flash momentarily, the short is on theControl Panel. Replace the Control Panel and retest the printer. Skip the restof this section if the PE and PS indicators flash because the problem iselsewhere in the printer.

g. Plug in all cables removed during service.h. Trace through all service steps performed to re-attach any cables that were

unplugged during debugging.i. Attach printer covers.j. Perform full test of printer.

7. Short circuit on 3.3 V power supply within the printhead.

a. REQURIED: Follow all procedures from 'Short circuit on 3.3 V powersupply within the electronics module' before proceeding. The followingprocedure relies on a working electronics module to determine if theprinthead is causing a short circuit.

b. With power cord connected, touch the metal electronics module to dischargeany static electricity. ESD damage to the printer may occur if staticelectricity is discharged to printer electronics.

c. Turn off printer and wait 30 seconds for power supply capacitors todischarge. Damage to circuits within the electronics module may occur if thepower supply capacitors are not allowed to fully discharge.

d. Plug in the printhead interface connector (J130) to the electronics module.This step adds the Control Panel back to a working electronics moduleand I /O board in order to see if the short circuit is also removed.

e. Turn on power to the printer.f. If the PE and PS indicators do not flash momentarily, the short is on the

printhead. Replace the printhead and retest the printer. Skip the rest of thissection if the PE and PS indicators flash because the problem is elsewhere inthe printer.

g. Carefully test the printer to ensure damage to the electronics module did notoccur due to the shorted printhead.

h. Plug in all cables removed during service.

i. Trace through all service steps performed to reattach any cables that wereunplugged during debugging.j. Attach printer covers.k. Perform full test of printer.


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Printer Is on and Can Print Pages, but the Control Panel AppearsFrozen and No Error Messages Are Displayed

NoteOpening and closing the front door of the printer causes a reset of the entireControl Panel.

1. Electrostatic Discharge.

a. If the printer is currently powered on and frozen, open then close the frontdoor of the printer and see if the LCD responds.

b. If printer appears functional after operating the door, advise client thatfailure may have been due to an ESD event. Thoroughly test printer for anyother problems.

c. Skip the rest of this section if printer now appears functional, otherwise

continue debugging.d. With power cord connected, touch the metal electronics module to discharge

any static electricity. ESD damage to the printer may occur if staticelectricity is discharged to printer electronics.

e. Turn off printer and wait 30 seconds for power supply capacitors todischarge. Damage to circuits within the electronics module may occur if thepower supply capacitors are not allowed to fully discharge.

f. Unplug power cord and remove printer's covers. Use caution around motors,pulleys and live AC connections when working with the printer covers off.

g. Examine printer for loose grounding connections, especially the groundstrap on the Y-axis motor. Eliminate the possibility of internally generatedESD from affecting printer.

h. Plug in all cables removed during service. Trace through all service stepsperformed to reattach any cables that were unplugged during debugging.

i. Attach printer covers.j. Perform full test of printer.

2. Control Panel failure

a. Unplug the original Control Panel at connector ('C' / J220) and plug in aknown working Control Panel. This step checks for a keypad or LCD failurein the Control Panel.

b. Plug in all cables removed during service. Trace through all service stepsperformed to reattach any cables that were unplugged during debugging.

c. Attach printer covers.d. Perform full test of printer.


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Printer Control Panel Is Functional, but Printer Won't Print Jobs Sentfrom Computer

1. Computer driver incorrect or improperly installed

a. Verify printer hardware is functional by sending a test print via the printerControl Panel.

b. If a test print is properly produced, continue to next steps, focusing onproblems outside the printer (network, Ethernet, or computer driverconfiguration issues).

c. If a test print is not properly produced, the focus of problems within theprinter suggests that the internal settings are corrupt.

d. Use a known functional computer to test printer using the printer's parallelport or USB port. If test computer successfully prints pages, review theversion of driver, the installation and the settings of the customer's computer.

NoteUsing the parallel or USB port eliminates any network complexitiesassociated with an Ethernet port.

e. If test computer is unsuccessful, continue with debug.

2. Customer network or printer's Ethernet port not properly configured

a. Please see Chapter 4 for procedures related to communication problems.

3. Printer internal settings corrupted.a. On the Control Panel, use the Hidden Service Menu to reset NVRAM.b. Perform full test of printer.

Printer Resets Unexpectedly

1. Transient on AC line tripped reset circuitry in printer.

a. Cycle power to ensure printer initializes during stable AC power.

2. Internal fault

a. Record any error codes and report to Xerox Office Group. If the printerdetects an error, the printer will attempt to reboot and re initialize (up tothree times) to correct the problem. After the third cycle of rebooting, anerror code displays on the LCD and flashes on the PS and PE indicators.


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Printer Optional Features Not Available

1. Printer configuration incorrect.

a. Verify proper configuration of printer using Control Panel.

2. Computer print driver configured incorrectly.

a. Examine print driver setup to ensure printer driver setup doesn't overridedesired features set via Control Panel.

3. Configuration card failure.

a. Verify configuration card is properly oriented and fully inserted.b. Verify printer model purchased corresponds to features expected.c. Clean configuration card contacts with isopropyl alcohol, reinstall, and

retest.d. Swap configuration card with a known working card. If printer works,

replace card with one containing identical features as originally purchase.e. The configuration card enables certain optional features in the printer. Care

must be taken to duplicate the features of the original printer when replacingthe card.

525-Sheet Feeder Does Not Function

1. Thermal safety fuse blown.

a. Power cycle printer.b. The safety fuse is a self resetting device. Power cycling ensures the fuse

cools enough to reset itself.

2. 525-Sheet Feeder faulty.

a. Turn off printer and wait 30 seconds for power supply capacitors todischarge.

b. Replace 525-Sheet Feeder.c. Perform full test of printer.

Printer Is On (Electronics Module LEDs are Illuminated) but the PrinterCannot Print Pages and the Control Panel Appears Frozen and No ErrorMessages Are Displayed

1. Nonspecific electronics failure.

a. Double check PS and PE indicators for any error code information. Theprinter self test is usually able to detect a failure that would cause this

symptom. Looking up the error code may save debugging time.b. If the PS and PE indicators are steady and dimly-on, replace the electronics

module, reassembly and retest printer.c. If the PS and PE indicators are blinking, brightly-on, or totally off, continue

debugging. A dim but steady on condition indicates some firmware was notproperly loaded into a logic circuit.


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d. With power cord connected, touch the metal electronics module to dischargeany static electricity.

e. Turn off printer and wait 30 seconds for power supply capacitors todischarge.

f. Unplug power cord and remove printer's covers.g. Unplug the following electronics module connectors:

Power Control to I/O board (J800) Power Control right (J400) Printhead data (J130) Waveamp signal (J790) Power Control left (J390) Y-Axis motor (J280)

h. This step removes all other circuits so the electronics module can be testedalone.

i. Plug in power cord and turn on power to the printer.j. The PE and PS indicators should flash an error code reporting that the

Control Panel is missing. If the proper error message is not flashed, replacethe electronics module and retest the printer. If PE and PS indicators flash,continue with debug.

k. Turn off printer and wait 30 seconds for power supply capacitors todischarge

l. Unplug the following electronics module connectors: Power Control to I/O board (J800) Power Control right (J400) Printhead data (J130) Waveamp signal ('J790) Power Control left (J390) Y-Axis motor (J280)

This step prevents any faults from the motors, clutches and sensors frompreventing the I/O board and Control Panel from functioning.

m. Plug in the I/O board connector ('P' / J800) in the electronics module. Thisstep adds the I/O board and Control Panel to the electronics module.

n. Turn on power to the printer.o. If the electronics module, I/O board and Control Panel are working, the error

code 34,001.43 should be displayed on the LCD to indicate the printhead isdisconnected.

p. If the correct error code is not displayed, replace the Control Panel and I/Oboard and verify the correct error code appears on the LCD. Retestelectronics module, I/O board, Control Panel combination.

q. If the correct error code is displayed, continue with the next steps of theprocedure.


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r. If no error code displays, return the original Control Panel and I/O board tothe printer. Replace the electronics module and then continue with the nextsteps of the procedure.

s. If a different error code is displayed, see the "Fault Code Error MessageTroubleshooting" on page 3-8 for a definition of the problem and theprocedures needed to solve the problem.

2. Repeat the following procedures to check all circuits connected to the I/O board:

a. Turn off printer and wait 30 seconds for power supply capacitors todischarge.

b. Plug in the following connectors, one at a time, and perform steps C and Dfor each connector.

c. Turn on printer and wait for the error code 34,001.43. Check that the threevoltage indication LEDs INSIDE the electronics module (visible through thevent holes of the electronics module near the AC power switch) are lit.

d. If the proper error code and LED doesn't appear after each I/O connector isreconnected, repair or replace the faulty circuit.

e. If the proper code appears, repeat the procedures until all I/O boardconnectors are plugged back in.

f. If repairs are made during this step, plug in all connectors to printer andretest. If printer is fixed, reattach covers to printer and perform a full test. If no

phaser 8500,8550 - service man

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