void infinite7 infinite8 mk2 amplifier service manual

Infinite 7/8 V2Service Manual Written By Rog Mogale

Infinite 7/8 V2Controls

1

4 5

6

7 3

2

14 3

2

Rear Panel

1.Input XLR's The input impedance of the balanced XLR's is 20Kohms. Pin 2 is signal + 2.Output XLR's Linked outputs from the inputs. 3.Bridge Mode Switch Selects Bridge Mode. A red LED will illuminate when the amplifier is operating in bridge mode. Use input 1 in bridge mode. See page 8 for more details. 4.25Hz Hi Pass Filter Switches Turns each channels 25Hz 18 dB/oct butterworth Hi Pass filter on or off. For maximum protection leave both filters on (pressed in position). 5.Parallel Mode Switch Links input 1 with input 2. See page 8 for more details. 6.Limiter Switches Turns each channels limiter on or off. For maximum protection leave in the on position (pressed in). 7.Filter Select Switches Independent channel selection of Hi Pass, Lo Pass or bypassed filters. 8.Crossover Frequency Switch Selects the crossover frequency point between the Lo and Hi Pass filters. 9.Crossover outputs Jack outputs for both Hi and Lo pass filters. See page 8 for more details. 10.CH1 Speakon Outputs In stereo/parallel mode use +1 and -1. In bridge mode use +1 and +2. CH2 output is on pins +2 and -2.11.CH2 Speakon Outputs In stereo/parallel mode use 1+ and 1-. Pins +2 and -2 are not used.12.Ground Switch Ground is connected when pressed in and lifted when pressed out.13.Output Binding Posts Accepts both 4 mm plugs or bare wire. Use CH1 + and CH 2 + for bridge out.14.Fuse Replaceable 35 Amp fuse for amplifier protection.15.Power Cable AC power in 230 VAC 50Hz. Fitted with 16 Amp CEE Form connector. (For 2 ohm operation a 32 Amp CEE Form connector must be fitted)

0 0

Infinite 8

1

2

On -18 - 6 0 L P

1 2

Standby Power

oo oo

Current Draw (Amps)

25Hz 25Hz

Filter TypeLo Pass

Bypass

Hi Pass

CH 2 CH 1

Limiter Limiter

Out 1 : Pin 1+ : ch 1 + Pin 1 - : ch 1 - Pin 2+ : ch 2 + Pin 2 - : ch 2 -

Out 2 : Pin 1+ : ch 1 + Pin 1 - : ch 1 -Bridge Mode : out 1 Pin 1+ : sig + Pin 2+ : sig -

InputsPin 1 :Pin 2 : +Pin 3 : -

CH 2 CH 1

Inputs

CH 2 GND CH 1

Link Outs

Fuse

XO

VE

RFR

EQ 90 Hz

120 Hz

160 Hz XOVEROUTPUTS

LO LO

HI HI

OUT 1

OUT 2

Brid

ge

OUT 2 OUT 1

ParallelInputs

BridgeMode

230V AC50Hz

Serial No

Bridge Input

On Off

5

6

Front Panel

1.Power Switch Used to turn the amplifier on or off.2.Standby LED Indicates that the amplifier is connected to the mains but has not been switched on.3.Level Controls Used to control CH 1 & 2's output levels.4.Power LED's The Power LED's indicate that each channel is active.5.Signal LED's When illuminated the LEDs indicate an audio signal is present at the channel's output.6.'CEP' LED's (L) The CEP LED's indicate the Clip Elimination circuit is active. The CEP circuit works by examining the audio output signal, it then regulates many circuits within the amplifier to eliminate all traces of clipping at the output. As a clipped waveform cannot be generated within the amplifier, careful monitoring of the input level is not necessary. Under normal working conditions the CEP LED's should be illuminated around 50% to 80% of the time. Note that the CEP circuit can only prevent a clipped waveform from be generated within the amplifier itself, it cannot remove a clipped waveform that has been produced from a component earlier in the chain. 7.Protect LED's (P) The protect LED's light up when the amplifier detects speaker over excursion, dangerous subsonic frequencies, DC or thermal overload. Note the protect LED's also indicate the soft start circuit is active, so will illuminate during power on. See page 8 for more details about the VSP protection circuit.8.Current Draw Display The LED readout displays the average RMS current being draw by the amplifier. As the value displayed is an averaged reading, peaks values will be higher than indicated. The readout is displayed in Amps (A) and values less than 0.8 Amps are not displayed. During switch on the meter will read 50 Amps, this is for calibration purposes and is not an indication of the current required during switch on.

7

8 91011

12 13

14 158

page 1

Infinite 7/8 V2SpecificationsNotes

Bridge Mode

Parallel Switch

VSP Velocity Sense Protection

Onboard Filter Network

Connect to input 1 only and use the two CH1 speakon outputs or both + binding posts.

Use +1 for signal + and +2 for signal - Minimum impedance in bridge mode must be 4 ohms, i.e. one 8 ohm load from each speakon. The amplifier is mono when running in bridge mode and both CH1 speakons output the same signal. When using the binding posts for bridge mode, CH 1 + terminal is signal + and CH2 + terminal is signal -

Input 1 is linked to input 2. Connect to input 1 or input 2, the same signal will output from both CH1 and CH2 outputs. Each channels level is set with its own level control.

Note that parallel operation on Infinite amplifiers is not like the parallel mode on some amplifiers that allow you to drive into very low impedances. Parallel mode on Infinite series amplifiers makes both inputs receive the same signal.

All version 2 Infinite amplifiers are equipped with velocity sensing protection. The VSP circuit monitors back EMF and will attenuate the output for a very brief period if the amplifier detects over excursion or potential damage to a speaker.

If very severe overload conditions are detected and speaker failure is imminent, the amplifier will mute its output for a brief period. Reducing the amplifiers output level will stop the protection circuit from muting the output in this situation.

Please note that the VSP circuit can only assist with protecting your speakers. It in no way guarantees complete protection against any component failure and safe working practices should always be followed with regard to matching amplifier output levels to speaker input ratings.

The onboard filter network allows both Hi and Lo pass filters to be set on individual channels. A typical arrangement might be to set a Lo pass filter on channel 1 and use it to drive bass speakers and to set a Hi pass filter on channel 2 and use it to drive midtop speakers. The frequency select switch would be used to set the crossover frequency in this case. The crossover frequency can be 90Hz, 120Hz or 160Hz.

Both Hi and Lo sections of the crossover are also output from the 4 rear panel jack sockets, permitting the onboard crossover to feed other amplifiers in the system. The Hi outputs are from the Hi Pass section and the Lo outputs are from Lo Pass section. This allows for the amplifier with the crossover to drive bass speakers and other amplifiers to drive midtop speakers, or vice versa. Note that the crossover outs, output both Lo and Hi crossover sections irrespective of what the amplifiers channel filters are set to.

Dimensions : 48.3 cm (19") wide, 13.3 cm (5.2") high and 50.4 cm (19.8") deep.

Weight:

Infinite 7 : 34.5 Kg (76.1 pounds) net. 38.0 Kg (83.7 pounds) shipping weight. Infinite 8 : 39.5 Kg (87.0 pounds) net. 44.0 Kg (97.0 pounds) shipping weight.

4

8

4

8

1kHz 1kHz10Hz-20kHz 10Hz-20kHz

0.1%THD+N 0.1%THD+N 0.1%THD+N

Infinite 7

Mode

Stereo(Both CH Driven)

Bridge Mode(Both CH Driven)

Impedance

RMS Output Power per ch

0.1%THD+N

both ch - 2 ohms 38 Amps

RMS Output Power per ch

Infinite 8

both ch - 2 ohms 26 Amps

1700 1689 2520 2509

1000 991 1380 1371

4900 4887 7600 7587

3400 3382 5040 5018

TECHNICAL SPECIFICATIONS

S/N 20Hz-20kHz, ref full output

20kΩ balanced

EFFICIENCY both ch driven

INPUT SENSITIVITY

FREQUENCY RESPONSE ref.100W@8Ω 20Hz - 20kHz +0.05 dB / -0.08 dBTHD ref. 4Ω, 1KHz

230 VAC 50Hz +/- 10%VOLTAGE RANGE

AMPLIFIER PROTECTION

1 Vrms

CROSSTALK

SLEW RATE

CMRR ref. 1KHz

INPUT IMPEDANCE

DAMPING FACTOR 1kHz and Below

CONNECTORS

COOLING

Infinite 7 45V/us - Infinite 8 40V/us

8 Ω - 87% : 4 Ω - 86% : 2 Ω - 85%

Input: balanced XLR Output: Speakon + Binding posts

4 Variable speed fans

Full short circuit, open circuit, thermal, ultrasonic, and RF protection, stable into reactive or mismatched loads

0.015%

>90dB>85dB

Infinite 7 >800 - Infinite 8 >750

105 dB

For Infinite models 7 - 8 v2

Maximum Current Draw

2 2450 2440 3800 3789

VOLTAGE GAIN, ref. 8Ω Infinite 7 90x (39dB) - Infinite 8 105x (41dB)

page 2

Infinite 7/8 V2Cable Layout

page 3

-+

+-

Ch1 OUT

Ch2 OUT

Temp

Lim LE

DG

ND

Pro IN

+24VS

igG

ND

+18V-18V

CH1Pro OUT-15VGND+ 15vCh2 Pro OUT

+15V

GND-15VTem

p(NTC)+

24VTem

p(PTC)

Ch1 VolC

h2 Vol

Power SW

120V

80V40V

40V80V

120V

+H-H+L- L +M

FB

FB

-M

+H -H

-L-MFB

FB

+m

+L

Ch2 O

UT

+

Ch2 O

UT

-

Ch1 O

UT

+

Ch1 O

UT

-

Temp

20V~020V~Tem

p

240V~

240V~

240V~ IN

FAN 1 OUT

FAN 2 OUT

9P1

9P2

9P1

9P2

Ch1 IN

GND

GND

FB

Ch1 IN

GND

GND

FB

4P1

4P2

7P1

5P2

5P1

5P2

CH

1VO

LC

h2 VO

L

3P1

3P2

2P3

2P1

2P2

2P3

2P4

2P3

2P4

2P5

2P5

1 Pro IN + 15V GND -15V2 Pro IN

4P1

4P2

7P1 3P

3

3P3

Temp

Lim LE

DG

ND

Pro IN

+24VS

igG

ND

+18V-18V

Infinite 7/8 V2Input Board& CrossoverSchematics

-2

+3

1IC?A

MC33079DG

R?

10KR? 10K

R?10K

R?10K

INP-

INP+

C? 100P

R?

K2X2

-2

+3

1IC?A

C?

104

C?

184

R?

47K

R?620K

C? 47UR?

10K

-2

+3

1

R?A

4558

1

4

3

2l

R?15k

R?

10kB5

B8

B7l

B6

R? 120k

R? 39k

R? 20k

R? 20k

-2

+3

1

R?A

4558

-2

+3

1R?A

4558A1

A4

A3l

A2

R? 120k

R? 39k

R? 20k

R? 20kC?

104

A5

A8

A7l

A6

R? 120k

R? 39k

R? 20k

R? 20k

-2

+3

1R?A

4558

-2

+3

1R?A

4558 B1

B4

B3l

B2

R? 120k

R? 39k

R? 20k

R? 20kC?

104

C?

104

C?

104

R?

2K4

R?10K

-2

+3

1

R?A

4558R?100K

123

R?

CH1.VOL

C?47u

R?100K

R?

470HI OUT

C?

47U R?100K

R?

470LI OUT

C?

47U R?10K

-2

+3

1

R?A

4558

R?10K

R?

10K

C?

27P

C?

K2X2

123

C?

CH2.VOL

-2

+3

1IC?A

MC33079DG

R?

10KR? 10K

R?10K

R?10K

INP-

INP+

C? 100P

-2

+3

1IC?A

C?

104

C?

184

R?

47K

R?620K

C? 47UR?

10K

-2

+3

1

R?A

4558

1

4

3

2l

R?15k

R?

10kB5

B8

B7l

B6

R? 120k

R? 39k

R? 20k

R? 20k

-2

+3

1

R?A

4558

-2

+3

1R?A

4558A1

A4

A3l

A2

R? 120k

R? 39k

R? 20k

R? 20kC?

104

A5

A8

A7l

A6

R? 120k

R? 39k

R? 20k

R? 20k

-2

+3

1R?A

4558

-2

+3

1R?A

4558 B1

B4

B3l

B2

R? 120k

R? 39k

R? 20k

R? 20kC?

104

C?

104

C?

104

R?

2K4

R?10K

-2

+3

1

R?A

4558R?100K

C?47u

R?100K

R?

470HI OUT

C?

47U R?100K

R?

470LI OUT

C?

47U

R?

10K

-2

+3

1

R?A

4558

R?10K

R? 10K

C? 27P12

C?

CH1.OUT

12

C?

CH2.OUT

-2

+3

1

R?A

5532

R?

10kR?

10k12

R?

2P

R? 10K

R? 18K

R?

R

C? C

C?

47U

C? 102

10

9

15

8

13

2

3

4

5

6

7

11

12

161

14

C?

JIC13600

R?7K5

R?

4K53

R?

9K31

C?

221-

2

+3

1

IC?A

5532

R?

9K31

R? 39K

C?331

C? 224J

C? 105J

C? 100U

R? 620

R?D

R?D

-2

+3

1

R?A

4558

1234

R?

4P

R? 22k

R?

464C?15p1kv

R?22K1W

R?

C R?620

G.OUT

C?

27P

R?

200

R?

47

C?562J

C?

222J

R?

7K5

Q?

1015

R?

270

R?150K

R?CE1

R?10K

-15V

K?

K2X2

R?820

R?

39K

-15V

R?

100

R?

100

R?

39K+15V

R?4K7

12345

R?

5P

-15

+15

123

R?

3P

-2

+3

1

R?A

5532

R?

10kR?

10k

R? 10K

R? 18K

R?

R

C? C

C?

47U

C? 102

12

R?

2P

R?

4K53

R?

9K31

C?

221-

2

+3

1

IC?A

5532

R?

9K31

R? 39K

C?331

C? 224J

C? 105J

C? 100U

R?620

R?

7K5

R?

100

R?

100

R?D

R?D -

2

+3

1

R?A

4558

1234

R?

4P

R? 22k

R?

464C?15p1kv

R?22K1W

R?

C R?620

C?

27P

R?

200

R?47

C?562J

C?222J

R?

7K5

R?4K7

G.OUT

Q?

1815Q?

K2X2

R?

270

R?150K

R?CE1

R?

10K

-15V

page 4

Infinite 7/8 V2Control Schematics

21

21

2

1

3

4

1 2 3456

12321

21

123456789

21

+7

-6

OU

T1

+9

-8

OU

T14

21

21

12345

21

+5

-6

OU

T7

21

21

21

123456789

21

21

21

+5

-4

OU

T2

+11

-10

OU

T13

123

1 2 3 4 5 6 7

21

21

1 2

21

2

1

3

4

21

21

+3

-2

OU

T1

123

21

21

R24

100k/1W

R82B10K

R131k

D24

BR86D

-+

SW1

SW_SL_D

PDT

D12LED

J31

CO

N3

Q4

Q2SA

1015

D31LEDR201.8k/0.5W

R16

18k

J25

CO

N9

R11

100k

U3B

LM339

U3C

LM339

R8680

Q6

Q2SC

1815

R25

100k/1W

J28

CO

N5

D19LED

R21

100k

D13

LED

U4B

LM393

R17

5.1k

D25LED

R2210k

R12

100k

D27

FR107

D9LED

J29

CO

N9

R9680

R82B10K

R26

100k/1W

D20LED

D25LED

R2310k

D14LED

D15

D1N

4148

U3A

LM339

U3D

LM339

J8CO

N3

J27

CO

N7

R1910k

D2610V

/0.5W

C15

2.2uF/63V

D28

FR107

D10LED

Q6

Q2SC

1815

C21

220uF/25V

D30

D1N

4007

R14

91k

D2910V

/0.5W

D16

D1N

4148

J30

CO

N2

R10

10k

D24

DB

104

-+ C

182.2uF/63V

R21

100k

Q3

Q2SA

1015

R1910k

U4A

LM393

J8CO

N3

D11LED

C22

4.7uF/50V

R15

30k

D23LED

C19

220uF/25V

R20

1.8k/0.5W

D23LED

+3V

0

0

0

+3V

0

+0.6V

+6.6V

+3.0V

+24V

+6.6V

+0.6V

+6.6V

0

0

+24V

0

0

0

0

+24V

0

0

0

0

+0.6V

+18V

+18V

+18V

+18V

0

0 0

+18V

00

0 00

0+

18V0

+18V

+18V

0

page 5

Infinite 7/8 V2Output Schematics

Q?15032

Q?15033

R?1W3R3

R?1W3R3

Q?1193

Q?1193

Q?1193

Q?1193

Q?1193

Q?1193

Q?1193

Q?1193

R?5W0.22

R?5W0.22

R?5W0.22

R?

5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22

R?5W0.22Q?

1194

Q?1194

Q?1194

Q?1194

Q?1194

Q?1194

Q?1194

Q?1194

R?1W16.5

R?1W16.5

D?FR307

D?FR307

R?10K

R?

10K

C?

222

C?

222

C?102

3

2

1

W?50

D?

SF14

D?SF14

R?

NTC 50E

C?103

R?

237

R?

PNP

R?

NPN

R?

237

D?4148

D?4148

Z?7V5

Z?7V5

R?10K

R?12K

R?12K

R?75

R?75

R?

1K62

R?100

R?NPN

Q?1815

R?NPN

R?PNP

R?PNP

Q?

1015

R?100

R?2K2

R?

150

C?104

C?470U16V

R?R

R?R

R?

12K1

R?R

R?2k2

C?104

C?470U16V

R?1K62

R?

12K

R?

750

R?

97k5

G

R?12k1

+

+

R? 1K62

7

1

+2

-3

4 5

6

8

IC?

LM311

R? 464K

R? 47K C?

47PD?

4148 R?

3KQ?3906

Q?3904

R?

5K9

C?47P

C?

10U R?12K

R?D

Q?

IRF1407

R?

47

R?

MUR1520

R?

MUR1520

R?

200K

R?

200K

R?

4K7

R?

4K7

R?1W12K

Z?1W3V9

Z?

1W10V

R?

2K

C?

332

7

1

+2

-3

4 5

6

8

IC?

LM311

R? 464K

R? 47K C?

47PD?

4148 R?

3K

Q?3906

Q?3904R? 5K9

C?47P

C?

10U

R?R

R?D

Q?

IRF1407

R?

47R?

200K

R?

200K

R?

4K7

R?

4K7

R?1W12K

Z?1W3V9

Z?

1W10V

R?

2K

C?

332

C8

D?

MUR1520R?

5W12

C?

103

C?100U25U

+R?

5W3K9

-©À¢40V

C?100U25U

+R?

5W3K9

94V

94V

47V

R?3W5K1

+

+

7

1

+2

-3

4 5

6

8

IC?

LM311

R? 464K

R? 47K C?

47PD?

4148 R?

2K2Q?

3906

Q?

3904

R? 5K9

C?47P Q?

IRF1407

R?

47

R?

200K

R?

200K

R?

4K7

R?

4K7

R?1W12K

R?

2KC?

332

C?

100U25U

+

-94V

C?104

-47V

Z?

1W12V

R?5W5K1

R?

5W12

C?

103R?

MUR1520

7

1

+2

-3

4 5

6

8

IC?

LM311

R? 464K

R? 47K C?

47PD?

4148R?

2K2Q?

3906

Q?

3904

R? 5K9C?

47P Q?

IRF1407

R?

47

R?

200K

R?

200K

R?

4K7

R?

4K7

R?1W12K

R?

2KC?

332

C?

100U25U +-141V

C?104

Z?

1W12V

R?5W5K1

R?

5W12

C?

103R?

MUR1520

L? 2UH

R?

104/400v

R? 5R6/5w

R?

104/275v

R?

5W3R9

C?

400V104

R?5W5R6

1234

R?

4P

R?

1W6R8

C? 104

123456789

R?

9P

R?

100k

R?

390k

C?100U25V

R?150K

Q?1815

Q?

1815

C?

100U25V

Q?

1815

Q?

1815

JK?

JK

D?

4148

R?390K

R?

CTN10K

R?

47

R?10

K1 K2

K? 67F85

+15V

+15V

-15V

GND

+VLED

FAG

+

+

JK

page 6

Infinite 7/8 V2PSU Schematics

ACb_22V

ACa_22V

-15V

+115C

-115C

+15V

+24V

CH

1_B

FC

H2_

BF

CH1_+L

CH1_-L

CH2_-H

CH2_+H

CH2_+L

CH2_+M

CH2_BF

CH2_-M

CH2_-L

CH1_-M

CH1_+M

CH1_+H

CH1_-H

CH1_BF

1

1

1

2

3

4

5

1

21

12

1

1

2

2

1

3

4

IN3

OUT2

GN

D1

1

2

3

4

5

6

1

12

21

2

1

3

4

1

12

12

3

54

12

1

1

1

1

2

3

4

12

1

2

1

3

4

21

1

2

3

4

1

1

12

1

2

1

3

4

2

1

3

4

12

1 2

21

1

2

3

4

5

6

7

1

2 1

1

2

3

4

5

6

1

21

2

1

3

4

2 1

12

12

1

2

IN1

OUT2

GN

D3

1

2

1

3

4

J22

AC_120V

J23

CH1_BF

Q2

Q2SC1815

C3

1000u35V

J1

CON5

J11

AC_40V

R2

5.1

C2

30000u63V

C8

100n

J17

AC_80V

J4 FAN_1

C2

30000u63V

D6

KBPC3510

+

D1

D1N4007

U2

MC7915C

J10

HEADER 6

J12

AC_40V

C4

470u35V

C11

154n

R3

0.5

NTC_10D-22

TR

D3

KBPC3510+

J18

AC_80V

C9

100n

C16

154n

C2

30000u63V

LS1

RELAY_SPDT_1A

J20

AC_120V

J5

AC_230V_IN

C2

30000u63V

J13

AC_40V

D1

D1N4007

NTC_10D-22

TR

C2 30000u63V

C1

1000u35V

C5

220u25V

J8

HEADER 4

C12

154n

J19

AC_120V

D7

KBPC3510

+

R4

0.5

J8

HEADER 4

J24

CH2_BF

J6

AC_230V_OUT

C10

100n

J14

AC_40V

D4

KBPC3510

-+

C2

30000u63V

X1

MAC224-6

D7

KBP10G

- +

C2

30000u63V

D1

D1N4007

C2

30000u63V

C6

220u25V

C13

154n

C17

154n

C2

30000u63V

R5

20k

D8

D1N4731

J2

CON7

J15

AC_80V

Q1

TIP127

POWER SW

AC_22V X 2

R6

13k

J9

HEADER 6

C2

30000u63V

J21

AC_120V

R1

1k

C2

30000u63VD5

KBPC3510

+

R7

15k

C7

100n

D1

D1N4007

C14

154n

C2

30000u63V

J3 FAN_2

U1

MC7815C

J16

AC_80V

D1

D1N4007

D2

KBPC3510

-+

00

0

0

0

0 0

page 7

Infinite 7/8 V2Control PCB

TO_POWER

TO CH2_OUT

TO CH1_0UTTO

INPU

T

CH1_VR CH2_VR

3U_L

ed d

isp

lay

SW1A250V

B5K

10V

1/2

W

10K

A10

15

680

10K

1N41

48x2

LM339

750 1K8

91K

10V-1/2W

10K

100K1W

100K1W

1N4007

50V4U7

B5K

1K8

BD104

25V

220U

BD104

C18

15

10K

FR10

7

100K

63V2U2

63V2U2

FR10

7

30K

18K

5K1

A10

15

680

100K

10K

C18

15

100K

100KLM393

100K1W

+ -

+ -

1

1 1

page 8

Infinite 7/8 V2Input PCB 1

47U/16V

POWER

47U/16V

GROUNDING

CH2

BRIDGED

VR2

PARALLELINPUTS

LOW_CUT

VR1

LOW_CUT

CH2 CH1

CH2 CH1

CH1

GND

LIMITER_ON

ON

LIMITER_ON

LIMI_CH1LIMI_CH2100U-25V

100U-25V

2U_IN_PRO.PCB

47U-16V47U/16V

47U/

16V

47U/

16V

47U/16V

104-

250V

184-

63V

184-63V184-63V

184-

63V

47U-

16V

100n

+15V_A-15V_A+15V_B -15V_B

HI

++

LO HI LO

111

11

1

1

1

Front View

page 9


POWER VR2VR1CH2CH1LIMI_CH1 LIMI_CH2100U-25V

MC3307920K39K

20K 104J

+15V_A -15V_A +15V_B-15V_B

10K

100P 10K100P

10K100P

100P 10K

10K

120K

2K43K6

MC33079120K

20K

104J

104J104JMC33079

MC33079

104J3K6

104J

2K43K6

3K6

104J

120K20K

20K

120K

120K

20K

120K

20K20K

120K

20K39K

39K20K

120K

20K39K

104J

104J

104J

10K

10K

20K

15K

20K

15K

10K 100K

10K

10K

10K

100K20K10K

10K

20K39K

20K39K

20K39K

20K39K

10K

100P

100P

10K10K

10K

27P

LM83

3

47K

47K

620K10K10K 620K

8K2

470

470

470470

100K

100K

100K

100K

10K10K

27P

10K

LM83

3

111

11

111

Rear View

page 10


Front View

-15V 0 +15V

-FB_CH1

-FB_CH2

220U-25V

22K-1%

220U-25V

22K-1%

INPUT_CH1

15P-1KV

INPUT_CH2

22K-1%22K-1%

15P-50V

15P-1KV

220U-25V220U-25V

105J

100U_16V_NP

OUTPUT_CH1

222-630V

25V100U

104J

OUTPUT_CH2

222-630V

15P-50V

25V100U

CLIP_ON_CH1

16V47U_NP16V47U_NP

100U_16V_NP

200E200E

105J

IN POWER

CLIP_ON_CH2NE5532P

NE5532P

11

11

1

1

1

1

page 11


Rear View

270E 7K5270E7K5

41484148

562J

620E-1%

224J

102J

5532

9K31-

1%

330P

27P

18K10K55

32

39K9K31

4K53220

P

820E

102J

18K

10K

9K31

-1%

39K A1015

150K

10K

7K5

100E

100E

JRC1

3600

104J

100E

100E

104J

150K

10K

7K5

100E

100E

4K53

-1%

4K53

-1%

47E-1%

100E

100E

4K7

4K7

100E

100E

104J

100E

100E

104J

464-1%

620E-1%

464-1%

10K

10K

10K

10K

4148

39K

39K

4K53

620E-1%

10K

10K

10K

10K 4148 C1

815

A101

5

330P

10K

27P

18K

9K31

220P

224J

A1015

820E

10K

820E

18K

562J

27P

620E-1% 27P

47E-1%

4148

4148

C1815

A101

5

4148 4148

820E

page 12

Infinite 7/8 V2 Output PCB

2A102

47P-100VC1815A1015

103-250V

U101

OUT-

OUT+953-1A-24DG-2

10u-35V

2A332

2A332

100u-25V

NP

MJL21193/A1943MJL21193/A1943MJL21193/A1943MJL21193/A1943MJL21193/A1943MJL21193/A1943MJL21193/A1943MJL21193/A1943

MJL21194/C5200MJL21194/C5200MJL21194/C5200MJL21194/C5200MJL21194/C5200MJL21194/C5200MJL21194/C5200MJL21194/C5200

IRF1407IRF1407

IRF1407MUR1520IRF1407

104/275VAC

INPU

T

0.22-5W

SF14

SF14

10E

10K

222

0.22-5W

0.22-5W0.22-5W

0.22-5W

3E9-5W0.22-5W

5K9

3K

5K92K2

2K2

464K47K

200K200K

4K74K7

5K9

104-400V

104-400V

SPARE

67F85

47K

12K-1%12K-1%237E-1%

12-3W 12-3W

20A20A

103-250V

47464K

0.22-5W

2K

104

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

16.5-1W16.5-1W

47P-100V 47P-100V

50

3.0-1W 10K

MUR1520

FB

6.8-1W

-L

IN4742A

-H

+H

U401

MJE15032MJE15033

2K

2K

47

12K-1W

100u-25V

47P104

A1015 C1815

47

47

10u-35V

U201 12K-1W

3V9-0.5W

100u-25V

47P104

A1015 C1815

19PIN

J2

1

NTC 50E

5E6-5W

IN4742A

NTC 10KMUR1520MUR1520MUR1520

12-3W

464K

-M MUR1520

+M +L

100u-25V1N4740A

2K

12K-1W

12K-1W

47K

4K74K7

200K200K

237E-1%

12-2W

3.0-1W2220.22-5W

2A103

2uH

2A332

2A332

103-250V 103-250V

0.22-5W

180K 1/2W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-3W

12K

390K/27K

PS2202M 090610

C181

5

464K

5K9

4K7

3K 4K7

4K7

47P/

100v

1N400739k

5mm5m

m

10mm

6mm

5mm

16mm

16mm

10mm 5m

m5mm

5mm

5mm

5mm

U301

U401

4148

4K7

5E6-5W

C1815 A1015

C1815

A1015

75EA1015

7V5

7V5

C1815

12K

1K62-1%97K512K 1K62-1%

750E-1%

750E-1%

104

FR307FR307

470u-16V 470u-16V

2K22K2

10K/6K8-1W

12K

C1815 A1015 97K5

100E

75E

100E

104

18mm

C181

5

A1015

C181547K

47P/100v

10mm

100k

100u/25V

100u/25V

9V3V9/0.5W1N4740

4K7

200K

200K

47P/

100v

10mm12K

C1815C1815

47P/

100v

A1015

C1815

10mm

200K

200K

+

+

page 13

Infinite 7/8 V2 PSU PCB

TIP127

0.5E-1W

0.5E-1W

953-1A-24DG-2

-L

-M

+M

+L

-H

-H

+H

+H

FB

FB

-H

-H

+H

+H

-M

FB

FB

+L

+M

3.9V/0.5W

JRC7815JRC7915

1

7PIN

C1815

2PIN

20K

15K

13K

1

5PIN

1000u_35V

1000u_35V

470u_35V

-L

2PIN2A103

x2 +

+

FAN

FAN

104

104

220u_25V

220u_25V

30000U_63V

30000U_63V30000U_63V 30000U_63V 30000U_63V

30000U_63V

224/250V

224/250V

224/250V

224/250V224/250V

224/250V

224/250V

30000U-63V

30000U_63V

30000U_63V30000U_63V

10D-20

10D-20

1K-0.5W

5R1-1W

22000U_63V 22000U_63V

KBPC3510W

KBPC3510W

KBPC3510W

KBPC3510W

KBPC3510W

KBPC3510W

page 14

Infinite 7/8 V2Test Procedures

page 15

1. Control Board Voltage Check.

With the amplifier connected to 230VAC, check that the front panel 'standby' LED is illuminated. If the green standby LED is illuminated then voltage is reaching the control board. If the standby LED is not illuminated, then check the rear panel fuse.

2. Protect and Channel Power On Check.

If the front panel 'standby' LED is illuminated switch on the amplifier via the front panel 'power' button. Both channels pink protect (P) LED's should illuminate between 1 to 2 seconds. You should also be able to hear the relays engage as the protect LED's stop illuminating. Now check if both channels 'on' LED's are illuminated. If one or both protect LED's stay illuminated, this indicates a problem on the channel(s) main output board.

3. PSU Output Voltage Assessment.

Make sure the mains input voltage is 230 VAC +/- 1V and connect the - probe of a DVM to chassis ground and the + probe to the + and - HV, MV and LV outputs on the PSU board. The outputs on the PSU board are shown in fig 1.

Here are the correct voltages for each respective Infinite model.

The PSU is working correctly if the measured voltages correspond to the above.Remember to check both channels output voltages.

+HV-HV

fig 1. PSU Board

4. Channel Output Board LV Check.

Make sure the mains input voltage is 230 VAC +/- 1V and connect the - probe of a DVM to chassis ground and the + probe to the bottom fuse on the left CH 1 output board. Do the same with the top fuse on the left channel and both top and bottom fuses on the right CH 2 output board. Left and right (CH 1 and CH 2) identifications are looking from the front of the amplifier. The following voltages should be measured if the amplifier is in correct working order.

Fig 2. shows the positions of the fuses on the left channels output board.

5. Input Board Voltage Check

To check that the rear input board is receiving the correct voltage connect the - probe of a DVM to chassis ground and the + probe to the +15 VDC & - 15 VDC inputs on the rear input board. Fig 3. shows the location of the +/- 15 VDC inputs for the input board. The +/- 15 VDC for the input board is fed from crossover board, which sits just in front of the rear input board. The crossover board derives its power from the front control board, which is powered from the main PSU board. The voltage from the PSU board can be checked at the (7 pin) connector on the PSU board. fig 1. shows the location of the 7 pin connector.

Infinite 7 V2

+ HV + 142.5 VDC+MV + 95.0 VDC+ LV + 47.0 VDC- LV - 47.0 VDC- MV - 95.0 VDC- HV - 142.5 VDC

Infinite 8 V2

Left CH bottom fuse +54 VDCLeft CH top fuse - 54 VDCRight CH bottom fuse - 54 VDCRight CH top fuse +54 VDC

Infinite 7 V2

Left CH bottom fuse +47 VDCLeft CH top fuse - 47 VDCRight CH bottom fuse - 47 VDCRight CH top fuse +47 VDC

Top Fuse Bottom Fuse

fig 2. Left CH 1 Output Board

TIP127

0.5E-1W

0.5E-1W

953-1A-24DG-2

-L

-M

+M

+L

-H

-H

+H

+H

FB

FB

-H

-H

+H

+H

-M

FB

FB

+L

+M

3.9V/0.5W

JRC7815JRC7915

1

7PIN

C1815

2PIN

20K

15K

13K

1

5PIN

1000u_35V

1000u_35V

470u_35V

-L

2PIN2A103

x2 +

+

FAN

FAN

104

104

220u_25V

220u_25V

30000U_63V

30000U_63V30000U_63V 30000U_63V 30000U_63V

30000U_63V

224/250V

224/250V

224/250V

224/250V224/250V

224/250V

224/250V

30000U-63V

30000U_63V

30000U_63V30000U_63V

10D-20

10D-20

1K-0.5W

5R1-1W

22000U_63V 22000U_63V

KBPC3510W

KBPC3510W

KBPC3510W

KBPC3510W

KBPC3510W

KBPC3510W

+MV-MV +LV-LV +LV-LV +MV-MV +HV-HVCH 1 CH 2

Infinite 8 V2

+ HV + 165.0 VDC+MV + 109.5 VDC+ LV + 54.0 VDC- LV - 54.0 VDC- MV - 109.5 VDC- HV - 165.0 VDC

2A102

47P-100VC1815A1015

103-250V

U101

OUT-

OUT+953-1A-24DG-2

10u-35V

2A332

2A332

100u-25V

NP



IRF1407IRF1407


104/275VAC

INPU

T

0.22-5W

SF14

SF14

10E

10K

222

0.22-5W

0.22-5W0.22-5W

0.22-5W

3E9-5W0.22-5W

5K9

3K

5K92K2

2K2

464K47K

200K200K

4K74K7

5K9

104-400V

104-400V

SPARE

67F85

47K

12K-1%12K-1%237E-1%

12-3W 12-3W20A

20A

103-250V

47464K

0.22-5W

2K

104

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

16.5-1W16.5-1W

47P-100V 47P-100V

50

3.0-1W 10K

MUR1520

FB

6.8-1W

-L

IN4742A

-H

+HU401

MJE15032MJE15033

2K

2K

47

12K-1W

100u-25V

47P104

A1015 C1815

47

47

10u-35V

U201 12K-1W

3V9-0.5W

100u-25V

47P104

A1015 C1815

19PIN

J2

1

NTC 50E

5E6-5W

IN4742A


12-3W464K

-M MUR1520

+M +L

100u-25V1N4740A

2K

12K-1W

12K-1W

47K

4K74K7

200K200K

237E-1%

12-2W

3.0-1W2220.22-5W

2A103

2uH

2A332

2A332

103-250V 103-250V

0.22-5W

180K 1/2W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-3W

12K

390K/27K

PS2202M 090610

C181

5

464K

5K9

4K7

3K 4K7

4K7

47P/

100v

1N400739k

5mm5m

m

10mm

6mm

5mm

16mm

16mm

10mm 5m

m5mm

5mm

5mm

5mm

U301

U401

4148

4K7

5E6-5W

C1815 A1015

C1815

A1015

75EA1015

7V5

7V5

C1815

12K

1K62-1%97K512K 1K62-1%

750E-1%

750E-1%

104

FR307FR307

470u-16V 470u-16V

2K22K2

10K/6K8-1W

12K

C1815 A1015 97K5

100E

75E

100E

104

18mm

C181

5

A1015

C181547K

47P/100v

10mm

100k

100u/25V

100u/25V

9V3V9/0.5W1N4740

4K7

200K

200K

47P/

100v

10mm12K

C1815C1815

47P/

100v

A1015

C1815

10mm

200K

200K

+

+

Fan ControlHeatsink

7 pinconnector

7PIN

ground + 15VDC- 15VDC

Infinite 7/8 V2Test Procedures

page 16

6. Bias Check and Trim

With the amplifier from cold, use a DVM to measure the voltage across one of the 5w 0.22 ohm resistors. The voltage measured should be 0.5mV. If the measured voltage is not 0.5mV then adjust pot 50 until you get a reading of 0.5mV. Fig 4. shows the position of one of the 5w 0.22 ohm resistors and Pot 50. Check both channels and make sure the channel to channel tolerance is below 0.2 mV. i.e. channel 1 reading 0.6 mV and channel 2 reading 0.4 mV. These values are the same for Infinite 7 and 8 V2 models.

7. Output Power Check

With the amplifier connected to the scope, sig gen and 8 ohm dummy load, connect a true RMS volt meter across the output of one of the channels. Run both channels and the same time and check that the voltages measured on each channel are the the same as listed below at 50Hz, 100Hz, 1Khz and 20kHz. Make sure both channels output limiters are on during this test.

8. Fan Voltage Check

Connect the - probe of a DVM to chassis ground and the + probe to the heatsink for the transistor that is part of the fan control circuit. The fan control heatsink is shown in fig 1.

If the amplifier is cold then the reading should be 9VDC. The output to the fans is continuously variable up to 24VDC. Check by running the amplifier that the fan voltage rises with the output heatsinks temperature.

9. Amp Meter Readings

The front panel amp meter only reads above 1 amp. So values below 1 amp will not be displayed.

Earlier models of Infinite 7 and 8 V2 used amp meters that could read below 1 amp. Expect to see an idle current of between 0.4 and 0.6 amps displayed if the amplifier is cold.

100U-25VLIMI_CH2LIMI_CH1 CH1 CH2 VR1 VR2POWER

100P

100P

10K

39K20K

39K20K

39K20K

39K20K

10K

10K 20K 100K

10K

10K

10K

100K

10K15K

20K

15K

20K

10K

10K

104J

104J

104J

39K20K

120K

20K39K

39K20K

120K

20K20K

120K

20K

120K

120K

20K20K

120K

104J

3K63K6

2K4

104J

3K6104J

MC33079

MC33079

104J 104J

104J

20K

120K

MC330793K6

2K4

120K

10K

10K100P

100P10K

100P

10K100P

10K

-15V_B +15V_B-15V_A+15V_A

104J20K

39K20K

MC33079

LM83

3

10K

27P

10K10K

100K

100K

100K

100K

470

470

470

470

8K2

620K10K 10K 620K

47K

47K

LM83

3

27P

10K

10K 10K

1 1 11

1

1 1 1

fig 3. input board (rear view)

- 15 VDC +15 VDC

fig 4. Left CH 1 Output Board

5w 0.22 ohm Resistor

Pot 50

Infinite 7 V2

86V into 8 ohmsBoth ch driven

Infinite 8 V2

96V into 8 ohmsBoth ch driven

Test Points

2A102

47P-100VC1815A1015

103-250V

U101

OUT-

OUT+953-1A-24DG-2

10u-35V

2A332

2A332

100u-25V

NP



IRF1407IRF1407


104/275VAC

INPU

T

0.22-5W

SF14

SF14

10E

10K

222

0.22-5W

0.22-5W0.22-5W

0.22-5W

3E9-5W0.22-5W

5K9

3K

5K92K2

2K2

464K47K

200K200K

4K74K7

5K9

104-400V

104-400V

SPARE

67F85

47K12K-1%12K-1%237E-1%

12-3W 12-3W

20A20A

103-250V

47464K

0.22-5W

2K

104

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

0.22-5W

16.5-1W16.5-1W

47P-100V 47P-100V

50

3.0-1W 10K

MUR1520

FB

6.8-1W

-L

IN4742A

-H

+H

U401

MJE15032MJE15033

2K

2K

47

12K-1W

100u-25V

47P104

A1015 C1815

47

47

10u-35V

U201 12K-1W

3V9-0.5W

100u-25V

47P104

A1015 C1815

19PIN

J2

1

NTC 50E

5E6-5W

IN4742A


12-3W

464K

-M MUR1520

+M +L

100u-25V1N4740A

2K

12K-1W

12K-1W

47K

4K74K7

200K200K

237E-1%

12-2W

3.0-1W2220.22-5W

2A103

2uH

2A332

2A332

103-250V 103-250V

0.22-5W

180K 1/2W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-5W

5K1/3K9-3W

12K

390K/27K

PS2202M 090610

C181

5

464K

5K9

4K7

3K 4K7

4K7

47P/

100v

1N400739k

5mm5m

m

10mm

6mm

5mm

16mm

16mm

10mm 5m

m5mm

5mm

5mm

5mm

U301

U401

4148

4K7

5E6-5W

C1815 A1015

C1815

A1015

75EA1015

7V5

7V5

C1815

12K

1K62-1%97K512K 1K62-1%

750E-1%

750E-1%

104

FR307FR307

470u-16V 470u-16V

2K22K2

10K/6K8-1W

12K

C1815 A1015 97K5

100E

75E

100E

104

18mm

C181

5

A1015

C181547K

47P/100v

10mm

100k

100u/25V

100u/25V

9V3V9/0.5W1N4740

4K7

200K

200K

47P/

100v

10mm12K

C1815C1815

47P/

100v

A1015

C1815

10mm

200K

200K

+

+

void infinite7 infinite8 mk2 amplifier service manual

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