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Article �PN93-4Service manual

Al3.8�2.228 re

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Contents

Pageintroduction 5� Description of design and operation 6�.� Purpose 6�.2 Performance features 6�.3 Nomenclature list 8�.4 Design and operation 9�.5 tools and accessories �0�.6 Designations and seals ���.7 Package ��2 Operation �22.� equipment limitations �22.2 Preoperation instructions �22.3 Mounting �32.4 Preparation for shooting �32.5 Zeroing procedure �42.6 Dry zeroing with UV-4 collimator �52.6.� initial zeroing of the sight with UV-4 collimator �52.6.2 Preparation for shooting with using of UV-4 collimator �62.6.3 Dry zeroing of the sight �62.7 range finding with the sight �62.8 Operation with the sight �72.8.� General �72.8.2 Operation �72.8.3 Preparation of the sight from battle position for carrying and transporting �83 Maintenance �83.� General �83.2 Safety �93.3 Maintenance �93.3.� Maintenance procedures structure �93.3.2 control inspection 203.3.3 Daily Maintenance 203.3.4 M.-� Maintenance 203.3.5 M.-2 Maintenance 223.3.6 Season maintenance 223.3.7 M.-�h Maintenance during storage 233.3.8 M.-2h Maintenance during long-term storage 233.4 Operation test 233.5 Preservation (depreservation, represervation) 24

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4 repair in service 244.� General inspection 244.2 troubleshooting 245 Storage 266 transportation 26 Appendix A list of figures 27

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IntroduCtIonthis manual describes design, operation, performance features, service

instructions and guides to troubleshooting for �PN93-4 article, essential for correct use of its technical features. Also, the list of possible damages and their removal with the use of single StA kit is indicated.

Besides the present manual, the following documents are needed for using the �PN93-4 article:

“7.62-mm SVD Dragunov sniper rifle. “charge unit set. Service manual Al4.799.00�re”.“Service manual for group StA kit Al3.8�2.228 re�”.

List of abbreviations

iZP - individual zeroing pointMPi - Mean point of impactrP - refference pointci - control inspectionDM - Daily maintenanceM.-� - Maintenance procedure N�M.-2 - Maintenance procedure N2SM - Season maintenanceM.-�h - long storage maintenance N�M.-2h - long storage maintenance N2StA - Spare parts, tools and accessoriesiit - image intensifier tubeUV-4 - Dry zeroing collimatorYK-3�6 - Battery tester

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1 desCrIptIon of desIgn and operatIon

1.1 purpose

�.�.� the �PN93-4 modular night vision sight (hereinafter referred to as the sight) is designed for battlefield observation and aimed shooting with SVD or SVDS sniper rifle under natural night illumination conditions.

�.�.2 the sight operates in ambient temperature range from -50 to +50 Oc and relative humidity up to �00% at temperature 25 Oc.

1.2 performance features

�.2.� the table � specifies the performance features.

table �

Name Value Note

Magnification, x 3.7 Field of view, deg �0 eye relief, mm 50 elevation adjustment range ±0-08 Windage adjustment range ±0-08 Battery voltage, V �.�5-�.5 Maximum consumption current, mA �00 continuous operation time, h for: t = + 50Oc �0 t = - 40Oc 3 t = - 50Oc 0.5 Weight, kg: on the rifle �.5 carrying set �.8 transport set 7.5 Overall dimensions of the sight, mm: length 250 width 8� height �82 Overall dimensions of the case, mm: length 336 width 295 height �89

�.2.2 the sight provides target recognition and aiming with the weapon, indicated in the p.�.� of the present manual, under natural starlight illumination conditions at clear weather, grass esplanade background and height of grass up to 0.3 m.

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the recognition range (500 m) for man-sized target depends on ambient illumination level, atmosphere transparency and object/background contrast. High ambient illumination, artificial illumination, moonlit night, clear atmosphere, light background (sand or snow) increase the recognition range. low ambient illumination, clouds, foggy atmosphere and dark background (tillage, forest etc.) decrease the recognition range.

�.2.3 the sight can use the following types of battery: - Nlts-0.9-� storage battery; - r6 (AA) size battery.�.2.4 Sight is zeroed by means of the dry zeroing collimator, index UV-4 .the UV-4 device specifications: - repeatability 0-00.25 - reticule graduation 0-0� - basis zeroing angle: vertical -0-02 horizontal 0

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1.3 nomenclature list

�.3.� the nomenclature corresponds to the table 2 or 3

table 2

code item Qty NoteAl3.8�2.228 the �PN93-4 article � Without

Nlts-0.9-�spare partsNlts-0.9-� storage battery 3removable parts

Al6.548.035 eye shield �r6 (AA) battery �tools

Al8.392.�00 Key spanner �Al8.896.0�3 Key spanner �

accessoriesAl5.087.326 Power supply � charge unitAl5.�00.062 YK-3�6 battery tester �Al5.�2�.�6� charge unit � charge unitAl5.�76.633-03 UV-4 dry zeroing

collimator�

Al5.940.677 light filter � For �PN93-4 article

Al6.644.493 cable � charge unitAl6.832.�74-02 Soft cover �Al8.890.00�-0� Napkin 3

Carrying meansAl4.�65.036 canvas bag �Al6.875.�38 case �

documentationAl3.8�2.228 re Service manual �Al3.8�2.228 PS certificate �Al4.799.00� re charge unit set.

Service manual�

note: the change of nomenclature according to the contract is available.

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table 3

code item Qty NoteAl3.8�2.228-0� the �PN93-4 article � Without r6 (AA)

batteryspare parts

Al6.548.035 eye shield �r6 (AA) battery 4tools

Al8.896.0�3 Key spanner �accessories

Al5.�00.062 YK-3�6 battery tester �Al5.940.677 light filter � For �PN93-4

article

Al6.832.�74-02 Soft cover �Al8.890.00�-0� Napkin 3

Carrying meansAl4.�65.036 canvas bag �

documentationAl3.8�2.228 re Service manual �Al3.8�2.228 PS certificate �

1.4 design and operation

�.4.� the sight is an electro-optical instrument that intensifies light from low-light night scene up to the human visual perception level.

�.4.2 electro-optical function diagram is presented in the figure A.2 (all pictures are listed in the appendix A).

the objective lens 2 (Figure A.2) forms a low-light image in the photocathode of image intensifier A� arranged in focal plane. the screen of image intensifier and aiming marks of reticule 4 are viewed through the eyepiece 3.

the light emitting diode VD� illuminates the reticule 4 through side surface. the aiming marks of reticule shines with red against the yellow-green background of image intensifier screen. Brightness of the reticule 4 is adjusted with resistor r�.

the microassembly A2 converts and multiplies voltage of the power source G� (G2).

the sight is powered by Nlts-0.9-� �0 storage battery (Figure A.�) or r6 (AA) sized battery.

the “ON” tumbler SA� activates the sight (Figure A.2).the light filter � protects the image intensifier against light overloads above

�.5 lx and allows zeroing the sight in daylight and twilight conditions.

�0

�.4.3 the sight consists of two main units: they are the body 4 (Figure A.6) and the objective lens 2 attached by means of threaded joint and secured with the nut 3.

All components of the sight with the exception of objective lens 2 are placed in the body 4. electronics compartment is under the cap �4. Optical details of the objective 2 are in their own frame.

�.4.4 the sight has the following controls:- “ON” tumbler ��;- “ “ reticule brightness adjustment handwheel �5;- “U↔D" elevation screw 5;- "l↔r" windage screw �0.the power is supplied to the iit (Figure A.2) and light diode VD�.the sight

operates when the "ON" tumbler �� is set in upper position.�.4.5 the body 4 (Figure A.6) has the battery compartment closed with the

cap �3 and the nipple intended for purging the interior space, covered with the cap 6 and the rubber gasket 7. in order not to loose the cap �3 it is fastened to the body 4 with a cord �2.

�.4.6 rifle mount unit consists of the bracket 6 (Figure A.7), lock screw 2, latch 3, lock lever 4, handle 5 and washer �.

�.4.7 the collar 8 (Figure A.6) fastens the eyeshield 9 to the eyepiece of the body 4 (Figure A.6). the eyeshield guides an eye to exit pupil position of eyepiece and protects it against accidental injures.

�.4.8 click of the elevation and windage screws is 0-00.4.�.4.9 Positive polarity “+” of battery and power supply is engraved on the

cap �4 of body 4.�.4.�0 the figure A.4 presents the aiming reticule. Aiming marks are sized

in mils. the upper (first) pike is the aiming point for 400 m range, - the second pike for 600 m, - the third pike for 800 m, - the forth line for 900 m, - the fifth line for �000 m ranges correspondingly.to the left and to the right of the upper horizontal row there are windage

correction divisions 0-05. Angular sizes of the divisions are designed to define the range from 400 to �000 m according to silhouette target of �.5 m height.

the ranges in the technical and horisontal pikes, except the fourth line, are designated in hectometers.

1.5 tools and accessories

�.5.� Placement of power supply � (Figure A.�), charging unit 2 and cable 3 for charging the Nlts-0.9-� storage battery is presented in the case � (Figure A.3).

�.5.2 the eye shield 4 (Figure A.�) is intended for working with the sight in night time under conditions, where a light level of masking is needed as it cancels bleaks on the face when the eye is shifted from the eye shield.

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�.5.3 the key spanners 6 and �2 (Figure A.�) is intended for adjustment of elevation and windage screws 5 and �0 (Figure A.6) and located in the pocket 2 (Figure A.3) of the case �.

�.5.4 the napkin 8 (Figure A.�) is for cleaning the outer optical surfaces and battery contacts. it is located in the pocket 2 (Figure A.3) of the case �.

�.5.5 the UV-4 dry zeroing collimator 5 (Figure A.�) is designed for:- getting the immage of the reticule with dry zeroing on the rifle;- determination of individual zeroing point (hereinafther iZP) for the sight

and rifle;- dry zeroing the sight to the iZP for the sight and rifle.For dark ambient illumination conditions, the UV-4 dry zeroing collimator is

equipped with the fabric sleeve 3 (Figure A.��).the shank 2 of UV-4 aims the body � with collimator unit along a rifle bore

axis. �.5.6 the YK-3�6 battery tester �� (hereinafter YK-3�6 ) is designed to check

the Nlts-0.9-� storage battery voltage. the front board of YK-3�6 has four light emitting diodes indicating corresponding voltage of tested battery. to define the battery charge level, install the charger as indicated on the body of YK-3�6. the light diode will show the battery charge level.

�.5.7 the soft cover �3 (Figure A.�) protects the sight when it is carried mounted on rifle.

�.5.8 the carrying bag 9 (Figure A.3) is used for carrying the sight in service.

1.6 designations and seals

�.6.� the cap �4 (Figure A.6) of the body 4 has the following designations: - index of �PN93-4 SVD sight; - logo of the manufacturer; Serial number is marked on the body (Figure A.7).�.6.2 the cover of case � (Figure A.3) has the �PN93-4 SVD index and serial

number of the sight.�.6.3 the case with the sight, single maintenance kit and service documents

is secured with seals.

1.7 package

�.7.� the sight with single StA kit and service documents is carried and stored in the case �.

�.7.2 the case has special beds, fastening bars and pockets for sight 3 with light filter � (Figure A.6), UV-4 dry zeroing collimator 8 (Figure A.3), charge unit 7 and service documentation attached according to the inventory sheet. Service documentation is packed in the plastic cover.

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2 operatIon

2.1 equipment limitations

2.�.� in order to prevent a damage of the sight: - do not activate the sight in daytime or twilight without light filter �

(Figure. A.6) attached; Warning! daylight damages the sight!- do not aim the sight at bright light sources (fires, headlights etc.) even with

the light filter attached.2.�.2 in the case a bright source appears in the field of view, switch off the

sight (lower position of tumbler “ON” ��).2.�.3 After operation, the sight must be switched off.2.�.4 Avoid a short circuit between contacts of battery through metal

objects.2.�.5 carrying of storage battery separate from the sight (e.g. in a pocket)

allows to avoid a casual short circuit and extends the battery life at ambient temperature below zero. the sight may use another batteries with the voltage from �.�5 to �.5 V.

2.�.6 the UV-4 dry zeroing collimator (hereinafter UV-4) is a precision equipment that requires careful handling under the following rules:

- store and carry UV-4 with dismounted shank only;- do not apply bending force to shank when mounting to or dismounting

UV-4 from a rifle;- do not mount UV-4 to dirty barrel or barrel with damaged muzzle;- a disassemble or adjustment of UV-4 is allowed in authorized workshop

only.

2.2 preoperation instructions

2.2.� learn design and fastening of the sight in the case and on the rifle. 2.2.2 Survey the operation terrain under daytime illumination before night

operation. 2.2.3 the sight delivered from storage facility must be depreservated before

using. remove lubricant from mounting surfaces of the sight and UV-4 by means of a rag. clean outer optical surfaces with napkin 8 (Figure A.�).

2.2.4 in case when masking or black-out battle task are required, set the flap eye shield 4 on the sight as follows:

- loosen the collar 8 (Figure A.6);- remove the eye shield 9 with the collar 8;- remove the collar 8 from the eye shield 9;- put the opened collar 8 (Figure A.6) on the flap eye shield 4 (Figure A.3)

taken from the single StA kit;- put the eye shield 4 (Figure A.3) on the eyepiece mounting;- tighten the collar 8 (Figure A.6).

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2.2.5 in case there is no charged storage battery Nlts-0.9-�, use the r6 (AA) battery as follows:

- switch off the sight;- remove the cap �3;- remove the storage battery from battery compartment;- take the r6 (AA) battery 9 (Figure A.�) off the StA kit and insert it in the

sight ensuring the polarity designated on the cap �4 (Figure A.6) of a body 4;- close the cap �3;- switch on the sight, check its operation and switch off.2.2.6 in case of using a gas-mask, loosen the collar 8 and remove the

eyeshield 4 (Figure A3) or 9 (Figure A6) together with loosen collar.attentIon! image of aiming reticule indicates the charge of storage battery.

if the image intensifier operates but the reticule is dim or invisible the battery is discharged.

2.3 Mounting

2.3.� the sight uses a side rail mount of dovetail type. Attach the sight to the rifle in the following order. Align the mount slot of the sight with the dovetail mount rail of the rifle, push the sight forward up to the stop and secure it by turning the handle 5 (Figure A.7) forward up to latching it in the bracket 6. the sight must be fastened secure.

the locking lever is adjustable. to adjust it, shift the latch 3 with spanner key 6 (Figure A.�) from under the head of the screw 2 (Figure A.7) and remove it, then reset the handle 5 by a number of teeth providing secure fastening with no swaying and set the latch 3 to its place.

2.3.2 the UV-4 is attached to the rifle in the following order: - insert the shank 2 (Figure A.��) (shank No 3 - calibre 7, 62) into the hole

designated as “N3” (Figure A.�2) of holder. the key flat of shank 2 (Figure A.��) prevents it against a turning and oriented according to the lug on the body.

- fasten the shank 2 on the body UV-4 with the screw � (Figure A.�2) up to the light touch, to lock the shank 2 (Figure A.��) in the holder;

- insert free end of the shank 2 into the rifle barrel up to the rubber ring.2.3.3 For zeroing in high background illumination conditions, use the fabric

sleeve 3. Wide end is intended for objective lens 2 (Figure A.6) of the sight while narrow end is for UV-4.the lugs on the body UV-4 must enter the custs of the sleeve. the ends of the sleeve are fastened with laces.

2.4 preparation for shooting

2.4.� For daytime and twilight time:- select a fire position;- put the rifle on the ground right side down in such a way as to avoid entering

a sand, snow etc. in the bore;- put the case with sight at left from the rifle as the cover of the case would

be opened to the left;

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- take the sight and attach to the rifle according to the p. 2.3 “Mounting” of the present manual;

- ensure the light filter � is attached to the sight (Figure A.6);- switch on the tumbler “ON” �� to upper position. the screen of image

intensifier will shine with yellow-green and the reticule with red in 4 seconds;- adjust brightness of the reticule aiming signs by means of handwheel

“ “ �5.2.4.2 Under night illumination condition, the preparation procedure is the

same as in daytime and twilight with the exception of light filter that must be removed.

2.4.3 Mounting and zeroing of the UV-4 should be carried out by two riflemen (for convenience) as follows:

- take UV-4 from the case;- attach the shank to the holder of the UV-4 according to p. 2.3.2;- insert the shank into the rifle bore up to the rubber ring, attached to the

shank;- turn the UV-4 around the bore axis by 360O; - in case of need, illuminate zeroing reticule of the UV-4 with a light source at

horizontal position of the rifle, or use the fabric sleeve according to the p. 2.3.4;- turn the UV-4 around its axis to align the vertical lines of zeroing reticule

in parallel to vertical axis of the aiming reticule while looking trough the sight mounted on the rifle. in case of difficulty for one rifleman, the operation can be carried out by two riflemen;

- hold the rifle and take a position for zeroing, e.g. prone with usual stock-weld and force. Do not rest the barrel against a foreign objects. Prevent the UV-4 against touching with foreign objects. Determine the position of upper aiming mark relative to the zeroing reticule of the UV-4 and check out if the position is stable at repeating setting of the UV-4. in case the upper aiming mark moves more than 0-00.25 (ref. to Note �), eliminate the problem according to the p. 4.2. of the present manual;

- tilt, swing and tight stock-weld the rifle while checking the fastening of sight by means of the UV-4 reticule. Displacement of the UV-4 aiming mark must be within 0-00.25, otherwise eliminate the problem according to the p. 4.2 “troubleshooting” of the present manual.

notes:�. Angular thickness of wide dashes is 0-00.3, that can be used for estimation

of displacement at repeated settings of the UV-4 or mount slackness. 2. Zeroing procedure is applied to the rifle lying horizontally.

2.5 Zeroing procedure

2.5.� Zeroing period for the sight is the same as prescribed for iron sight by the shooting manual for the SVD rifle.

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2.5.2 For zeroing the sight under daylight or night illumination:- attach the sight to the rifle according to the p. 2.3 “Mounting” of the present

manual;- fasten the rifle in a stable aiming rest;- set the elevation bar of SVD sniper rifle to 400 m range;- aim the rifle with the iron sight to an aiming point at the �00 m range. the

rifle SVDN is aimed under bull’s eye;- ensure the light filter � is attached to the sight;- switch on the sight (upper position of tumbler “ON” ��);- adjust brightness of aiming reticule by means of handwheel �5 “ “;- check the alignment of the upper aiming pike with the aiming point of

iron sight.2.5.3 if the upper aiming pike and aiming point do not coincide, align them

in the following order: - adjust the elevation screw 5 “U↔D" and windage screw �0"l↔r" by means

of the key spanner 6 or �2 (Figure A.�) to align the aiming point of sight with the aiming point;

- detach the rifle from the aiming rest;- fire four single shots thoroughly and uniformly, aiming with the sight;- determine grouping and the mean point of impact (hereinafter MPi)

according to the shooting manual for SVD rifle. the grouping should be not worse than one for rifle without a sight. if

grouping is acceptable, commander determines the MPi position relatively to the reference point (hereinafter rP). the rP for SVD rifle is above aiming point by 22.5 cm.

the MPi displacement must be within 3 cm from the rP.if the MPi displacement exceeds 3 cm, adjust by the following:- if MPi shifts downward or upward, turn the screw 5 “U↔D" (Figure A.6) of

the windage mechanism with the key spanner 6 or �2 (Figure A.�) to the side of mark “U” if the MPi is below rP or to the “D” mark otherwise. One click of the screw 5 “U↔D" corresponds to 4 cm displacement of MPi at �00 m range;

- if MPi shifts to the left or to the right, turn the screw “l↔r" �0 of the windage mechanism to the side of mark “r” if the MPi is situated to the left of the rP or to the “l” mark otherwise. One click of the screw “l↔r" �0 corresponds to 4 cm displacement of MPi at �00 m range;

- test, whether the settings of the turn of the screws “U↔D" 5 and "l↔r" �0 are correct with repeated shooting;

- switch off the sight.

2.6 dry zeroing with uV-4 collimator

2.6.1 Initial zeroing of the sight with uV-4 collimator

2.6.�.� Attach the UV-4 and the sight to the rifle according to p. 2.4.3;2.6.�.2 Align the upper pike of aiming reticule with the center of zeroing

reticule (the point having coordinates x=0; y=0) by means of elevation and windage screws. the position corresponds to mean aiming angle at range �00 m.

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2.6.2 preparation for shooting with using of uV-4 collimator

2.6.2.� Attach the UV-4 and the sight to the rifle according to p. 2.4.3;2.6.2.2 Align the aiming reticule as prescribed by p. 2.6.�.2. 2.6.2.3 remove the UV-4 from the rifle. 2.6.2.4 Fire four single shots thoroughly and uniformly aiming SVD through

the sight at target ranged by �00 m. Aim the pike under bull’s eye.2.6.2.5 Determine accuracy, MPi position and displacement (x,y) of MPi from

rP according to the shooting manual on SVD rifle and p. 2.5 of the present manual.

2.6.2.6 if the displacement of MPi from rP exceeds the limit prescribed by shooting manual, attach the UV-4 to the rifle according to the p. 2.4.3 of the present manual again and move the upper aiming pike to the point having coordinates x,y in zeroing reticule of UV-4 by means of elevation and windage screws. the division 0-0� of zeroing reticule corresponds to �0 cm displacement at range �00 m.

2.6.2.7 Detach the UV-4 from the rifle, fire 4 single shots and repeat the p. 2.6.2.5 again.

2.6.2.8 if the displacement of MPi from rP is acceptable (inaccordance with the service manual), the point having the x,y coordinates where the aiming pike was positioned to, is taken as the individual Zeroing Point (hereinafter iZP) for this sight.

2.6.2.9 record the coordinates of iZP, serial numbers of UV-4 and the sight in the logbook of the sight.

2.6.3 dry zeroing of the sight

2.6.3.� the dry zeroing of the sight is needed in the case of misalignment of aiming axis from rifle’s bore axis due to an impact, accidental disadjustment etc.

2.6.3.2 Attach the UV-4 and the sight to the rifle according to p. 2.4.3.2.6.3.3 check the alignment of the upper aiming pike with point and

coordinates of the iZP.2.6.3.4 in case of a misalignment, align the upper aiming pike with iZP (x; y)

designated in the logbook.2.6.3.5 Detach the UV-4 from the rifle. Zeroing is completed.note: the iZP position can change under long or extensive service, which may

lead to dicrease of the shooting effectiveness. in case of large misalignment, determine new position of iZP with test fire according to the p. 2.6.2.

2.7 range finding with the sight

2.7.� range to a target can be defined through angular size of target or landscape detail of known height.

the figure A.5 guides on determination of range to a target of known height by means of reticule aiming marks in the field of view.

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range to a target near a landscape object of known height is estimated in the following order:

- match the angular size of a landscape object of known height with a mark of aiming reticule (angular sizes of aiming marks are presented in the figure A.4 in mil units);

- calculate the target range with the formula:

r = where: r = range to the target, m; H = height of the target (or reference object), m; A = angular size of the target (or reference object), mil.

2.8 operation with the sight

2.8.1 general

2.8.�.� result of surveillance and shooting with the sight depends on experience, since color, appearance and contrast of image differ from usual for a naked eye under daylight. When observing and searching a target, minimal brightness of aiming reticule is recommended.

2.8.�.2 in the order to prevent a light overload of the sight, practice studies with the sight (3-5 will be enough) should be carried out at illumination only below 5x�0-3 lx.

2.8.2 operation

2.8.2.� Switch on the sight.2.8.2.2 Point the aiming pike with a rifle at a target according to windage

and elevation. For range within 400 m, aim the upper pike at center of target if the target

is high (running figures etc.). Aiming point is located below point of impact:- by 22.5 cm for �00 m range;- by 40 cm for 200 m range;- by 32.5 cm for 300 m range;- by 0 cm for 400 m range.if a range exceeds 400 m, select the reticule aiming pike according to the

range and aim it at the center of target.transverse moving target is engaged either by tracking or ambush methods

(firing attack). Predicted interval for tracking method, transverse moving target (90 deg) at speed of 3 m/s and range 300 m is 0-04. For tracking method at range above 300 m the prediction is 0-06.

For ambush method, use a vertical line mark of aiming reticule as a predetermined engagement point (instead of landscape detail as for daylight shooting).

in the case of fast-moving target, the predicted interval is proportional to the target speed.

Hх�000 A

,

�8

to repeat shooting with the ambush method, transpose the rifle ahead of the target and repeat shot at the moment the target approaches.

in the case of long exposition by a bright light source, switch off the sight.

2.8.3 preparation of the sight from battle position or carrying and transporting

2.8.3.� Prepare the sight for carrying in the following order:- switch off the sight (tumbler “ON” �� (Figure A.6) at the bottom position);- attach the light filter � to the sight if worked without it;- open the cap �3, remove the battery �0 (Figure A.�) or element type r6 (AA)

and place it into the bag 9 (Figure A.3);- close the cap �3 (Figure A.6);- remove the sight from the rifle and pack it into the bag 9 (Figure A.3).the napkin 8 (Figure A.�) and key spanners 6 and �2 of single StA kit should

be also packed into the bag 9.2.8.3.2 Preparation of the sight for transportation is implemented in the

same way as for carrying. the difference is the following: the sight is packed in the case and fastens according to Figure A.3.

3 MaIntenanCe

3.1 general

3.�.� Keep the sight clean, prevent it against dust or dirty. Outer optical surfaces must be always clean.

clean the outer optical surfaces and electric contacts with bleached flannel N� GOSt 29298-92, cotton wool for optical industry grade G, refined ethyl alcohol of high grade GOSt �8300-87, medical ethylic ether eM or mixture (�0% alcohol with 90% ether).

to clean a glass surface against grease stain, wipe it with clean flannel or cotton wool. in the case of severe dirtying, clean the surfaces by means of a solvent (alcohol, ether or their mixture) in the following order:

- prepare a cotton wool swab with wood stick;- wet the swab with the prescribed solvent and shake up it to remove an excess;- wipe the glass with wetted swab more than once avoiding touching the

mounting;- wipe the glass with dry swab with circular motions from center to periphery.

Finish cleaning.Avoid wetting of mounting with solvent because it can solve the sealing

compound and break tightness of the sight.clean the contact ground A (Figure A.8) and contacts of storage battery

against corrosive stains in the same way.3.�.2 in order to ensure operational readiness, increase reliability, prolong overhaul

life, and for timely exposure and elimination of reasons, which cause the damage of units and details, the sight is a subject of periodical maintenance. technical maintenance of the sight is intended for implementing preventive measures for long time storage and elimination of damages, found while observing.

�9

the maintenance system includes the following procedures:- control inspection (ci);- daily maintenance (DM);- maintenance procedure N� (M.-�);- maintenance procedure N2 (M.-2);- season maintenance (SM);- long storage maintenance N� (M.-�h);- long storage maintenance N2 (M.-2h);

3.2 safety

3.2.� ensure secure fastening of the sight and UV-4 on the rifle to avoid an injury in service.

3.2.2 Avoid an excessive pressure to eyeshield when viewing. the eyeshield should be pressed until clear boundary of field of view appears.

3.3 Maintenance

3.3.1 Maintenance procedures structure is indicated in the table 4

table 4

type of maintenanceterms of maintenance

Service Short-term long-term storage

ci Before using the sight

- -

DM � After each using2 Once per two week if was unused

- -

M.-� � After acceptance by military unit2 Yearly

At placing in storage

M.-2 � After �000 hours of operation2 After replacement of image intensifier ePM62G-22A, taken from the group StA kit

At placing in storage

SM twice per year at winter/summer and vice versa season changing

M.-�h After 6 month YearlyM.-2h Once per two

year

20

3.3.2 Control inspection

3.3.2.� the control inspection includes a visual inspection of outer surfaces and operation test according to the table 8. the unspection is carried out by personnel that uses the sight.

3.3.3 daily maintenance

3.3.3.� the daily maintenance (hereinafter DM) ensures regular readiness of the sight and UV-4. the DM of the sight and UV-4 is carried out by infantry unit personnel in the hours and days prescribed by daily routine and after shooting.

3.3.3.2 the DM includes condition inspections and operation tests according to the table 8.

in the case of need, it also involves the works prescribed in the table 5.

table 5

Work requirements tools and materialsWipe the sight, charging unit, UV-4 collimator, YK-3�6 and case against dust, dirty and moin-ture

the sight, charging unit, UV-4 collimator, YK-3�6 battery tester, and case must be clean

rags

lubricate uncoated metal mount surfaces of the Sight and UV-4 collimator including shank with layer of lubricant

Uncoated outer metal surfaces must be free from corrosion

GOi-54p GOSt 3276-89 viscous lubricant

clean contacts of the sight, battery, YK-3�6, battery tester. Procedure accords with p. 3.�.�

contacts must be clean tools and materials ac-cord with p. 3.�.�

clean outer optical surfaces.Procedure accords with p. 3.�.�

Outer optical surfaces must be clean

tools and materials ac-cord with p. 3.�.�

charge the storage batteries �0 (Figure A.�) according to the service manual on charging unit Al4.799.00�re

Storage battery must be fully charged

charging unit Al4.799.00�

3.3.4 M.-1 Maintenance

3.3.4.� the M.-� maintenance (hereinafter M.-�) ensures the readiness of the sight and UV-4 in service. the M.-� is to be carried out by infantry unit personnel.

2�

in the case of need a specialist of technical servicing facility can participate.3.3.4.2 the M.-� involves all procedures of daily maintenance and the

following works:�) field test of recognition range;2) repair and painting the case � (Figure. A.3) with Ml-�65PM GOSt �2034-77

camouflage enamel. test the recognition range for real target (silhouette figure of �.5 m height

with helmet and field overcoat) under natural night illumination (3-5)x�0-3 lx without fog, rain and snowfall. the recognition ranges for various backgrounds are specified by the table 6.

table 6

Background Minimal recognition range, mGreen grass, open area 500Snow, open area 500Yellow grass (sand) 500coniferous forest 80

Distance from target to coniferous forest must be 25 m at least. Start the measuring of recognition range from illumination (�-5)x�0-2 lx and continue the measuring up to (3-5)x�0-3 lx. check the illumination every 5 minutes.

Measure the terrain illumination by means of landolt ring of sizes prescribed in figure A.9. the langolt ring must be black colored against of white shield.

two riflemen are applied for measuring: an observer and an assistant. the observer stands still. the assistant moves from the observer to the target on �5-20 m and directs his face to the observer. then the assistant rotates the shield around the ring axis and stops it.

the observer must define position of a gap in the ring. if he defines right, the assistant moves from the observer, otherwise assistant moves to observer. the observer repeats the definition of gap position.

Measure the maximal range where the observer defines gap position right. With figure A.�0 determine the illumination according to the measured range.

the performance criterion is the determination of silhouette target details (contours of head, body and direction of raised hands) within 3 seconds at moment when illumination reaches (3-5)x�0-3 lx.

in the case of trouble that can not be eliminated by means of single or group maintenance kit, send the sight to repair facility.

3.3.4.3 For short-term storage of the sight and UV-4, the following works must be done:

- cover the uncoated surfaces of the sight’s mount rail and the mount seat of UV-4 with thin layer of GOi-54p viscous lubricant;

- wrap lubricated key spanners (Figure A.�) and shank into the P-45 GOSt �760-86 parchment;

- remove the storage battery.

22

3.3.5 M.-2 Maintenance

3.3.5.� the M.-2 maintenance (hereinafter M.-2) restores readiness of the sight after expiration of specified operating time or after replacement of worn-out parts.

the M.-2 is carried out by technical servicing staff on the basis of singe and group maintenance kits and general-purpose tools.

3.3.5.2 the M.-2 consists of works listed in the M.-� (except of range finding) and additionally according to the table 7:

table 7

Work requirements tools and materialstest the limiting resolu-tion, image quality and recognition range

the Sight must resolve the pattern N�0 of GOi N5 test chart and pat-tern test N4� of the collimator. the pattern N�0 is regarded as resol-ved if an observer can define all four directions of bars

UKNP-�M collimator (�Yu6); GOi N5 test chart

Fill up all mising parts of single maintenance kit from group maintenance kit

According to the table 2 or 3 “Package inven-tory”

Group StA kit according to inventory sheet Al3.8�2.228 Zi�

Dry out the sight (if ne-cessary)

According to service manual for group StA kit Al3.8�2.228 re�

refresh the paint coat of the sight and UV-4 collimator if damaged

A damage of paint coa-ting is not allowed

Ml-�65 PM black enamel 4Hl� GOSt �2034-77

test the recognition range test with UKNP-�M collimator. in the case of urgency need the test can be carried out in a field, as indicated in M.-�.

3.3.5.3 in the case of preparation for long-term storage,besides indicated works, do the following additional ones:

- cover all unpainted surfaces of mounting rail of the Sight and seat surface of UV-4 collimator with thin layer of GOi 54p viscous lubricant;

- wrap all lubricated key spanners (Figure A.�) and shank into P-45 GOSt�760-86 parchment;

- remove the storage battery.

3.3.6 season maintenance

3.3.6.� the season maintenance of the sight in service is carried out by infantry unit personnel. in the case of need a technical servicing specialist participates. the works of SM are the same as for DM (p. 3.3.3).

23

3.3.7 M.-1h Maintenance during storage

3.3.7.� the M.-�h maintenance (hereinafter M.-�h) is carried out by storage facility staff and technical servicing specialist.

3.3.7.2 Before the M.-�h, carry out the depreservation procedure according to p. 2.2.3.

Works and tests for the M.-�h are same as for the DM.After the maintenance, restore the conservation.

3.3.8 M.-2h Maintenance during long-term storage

3.3.8.� Before M.-2h maintenance (hereinafter M.-2h), carry out the depreservation procedure according to p. 2.2.3.

the M.-2h consists of the works prescribed for M.-� (with the exception of recognition range test), inspection of the sight’s set packaging, optics of the sight and, UV-4 light filter, contacts of the sight and storage battery. After the maintenance, restore conservation.

3.3.8.2 in the case of damage or malfunction which is not eliminated by means of the single and group StA kits, sent the sight into repair facility.

3.4 operation test

3.4.� the battle readiness, reliability and operation life depend on regular maintenance and inspection.

inspect the sight in service in proper time. the operation test is carried out in all kinds of maintenance to eliminate and remove damages. technical condition of the sight is characterized by its accuracy, full strength and battle readiness.

3.4.2 the table 8 presents the main procedures for testing the state and operability of the sight.

table 8

Subject and methods of testing requirements

inventory of the package contents is checked by comparison with the table 2 or 3 of the present manual

contents of package must correspond to the table 2 or 3 of the present manual

inspect the sight and single StA kit visually

Outer surfaces must be free of cracks, indents, corrosion and other defects

test the fastening security by swin-ging

A swaying of the mounted sight is not allowed

inspect the optical surfaces of the sight, light filter � (Figure A.6) and UV-4 5 (Figure A.�)

Outer and inner surfaces of optics must be free from physical damages, fat stains or other dirtying

inspect the contacts of sight and storage battery visually

contacts of battery and contact grounds must be free of oxidation, fat stains or other dirtying

24

continue the table 8

Subject and methods of testing requirements

Switch on the sight (light filter � must be attached) with tumbler “ON” �� (Figure A.6) to check its operability

image in the eyepiece must shine

test the reticule brightness adjustment and purity of image as the follows: attach the light filter �, switch on the tumbler “ON” �� (upper position) and rotate the handwheel �5 “ “

Brightness of aiming marks must change and their contrast must be enough for their detection

check the voltage of storage battery G� (G2) by means of a device, having accuracy class above 2.5 (for example, combined device ts 4353) a voltmeter

the voltage of storage battery G� and G2 must be within �.�5-�.5 V

Screw the light filter on the sight to check if the thread is fit

the light filter must screw without a jamming

3.5 preservation (depreservation, represervation)

3.5.� For preservation the sight and single StA kit, cover the unpainted seat surfaces of the sight and UV-4, key spanners and shank with GOi-54p GOSt 3276-89 viscous lubricant.

3.5.2 During long-term storage, refresh the preservation of the sight and single StA kit each two years up during storage term.

3.5.3 to reactivate the sight and UV-4, remove the lubricant with rugs.

4 repaIr In serVICe

4.1 general inspection

4.�.� in the case of a malfunction, ensure the followings:- the rifle mount is secure;- the light filter is attached;- the optics is free of dirt, dust, oil, frost and moisture;- battery charge is enough;- the sight is switched on;- the contacts are clean.

4.2 troubleshooting

4.2.� the table 9 guides on possible causes of malfunction and methods of their elimination.

25

table 9

trouble Possible cause troubleshooting

the screen of image in-tensifier does not shine

� the battery is dischar-ged2 Malfunction of image intensifier A� (Figure A.2)

� replace the battery with operable2 Sent the sight to repair facility

Brightness of image rises to maximum and falls down fast or fluctuates disturbing the viewing

light overload Attach the light filter � (Figure A.6) to the objec-tive lens 2

image is weak and de-graded

Sweating or dirtying of outer optical surfaces

Wipe the outer optical surfaces of the objective lens and eyepiece with napkin 8 (Figure A.�)

image is weak and deg-raded. there are flashes and blinks

Sweating of inner optical surfaces or of image intensifier’s photoca-thode

Send the sight to repair facility for drying and sealing

Dark spots in the field of view disturb viewing

� the image intensifier is damaged by bright light source2 Flaking of the photoca-thode

� Send the sight to repair facility

2 Send the sight to repair facility

the aiming reticule does not shine when the tumbler “ON” �� is switched on (Figure A.6)

� the battery is dischar-ged2 Malfunction of light emitting diode VD� (Figure A.2)

� replace the battery

2 Send the sight to repair facility

No results in aiming after repeated adjustment of UV-4 on the weapon of more than 0-00.25

� the barrel is dirty or wornout2 the barrel has wire - edges or nicks3 the axis of a barrel is deformed or dirty

� clean or replace the rifle2 repair the rifle

3 Adjust in the night time with straightening target

Spontaneous displace-ment of aiming pike relative to reticule of UV-4 more than 0-00.25

� Wobbling mount of Sight on rifle

2 Wrong mounting of UV-4 in the rifle

� repair or replace the rifle or adjust mount ac-cording to the p. 2.3.�2 Set the UV-4 in barrel properly

Jamming of shank in the rifle barrel

� the barrel is dirty2 the shank UV-4 is dirty

� clean the rifle2 clean the shank

26

continue the table 9

trouble Possible cause troubleshooting

the shank spontaneously rotates in the rifle barrel

� the barrel is wornout2 the shank is wornout

� replace the rifle2 Zero with a zeroing target

illumination of zeroing reticule UV-4 is insuffi-cient

� Dim ambient illumi-nation 2 Outer surface of pro-tective glass is dirty

� Aim the UV-4 at bright light source2 clean the protective glass with napkin

5 storage

5.� Storage only inspected, operable and clean sights.the sight is stored in the case together with single StA kit and service

documentation.5.2 the sight is stored in heated room at temperature range from +5 to +35Oc,

relative humidity up to 85% and daily temperature variations up to 5 Oc.5.3 the sight in the case must be placed on a shelf. Storage of the sight

on a floor or near heaters, windows or under direct sunlights exposition is prohibited.

5.4 long-term storage period is �0.5 years.5.5 in the case when storage of sight in a heated room is not available, store

the batteries Nlts-0.9-� and r6 (AA) in a room at temperature range from +�0 to +25Oc.

6 transportatIon

6.� the sight with single StA kit and service documentation can be transported by any kinds of transport in the case.

6.2 Before transportation, inspect fastening of the sight, single StA kit and service documentation in the case. case must be locked completely.

6.3 During transportation the case must be set cover upward. Do not throw or turn over the case with the sight.

6.4 the sight mounted to rifle can be transported in the case of absolute necessity only.

27

appendix a(obligatory)

List of figures

Figure A.� - Single StA kit Figure A.2 - electro-optical function diagramFigure A.3 - case package chartFigure A.4 - Aiming reticule Figure A.5 - examples of ranging with reticuleFigure A.6 - Sight with light filter attachedFigure A.7 - Night vision sightFigure A.8 - Battery compartmentFigure A.9 - landolt ring for estimation of illumination Figure A.�0 - Plot for estimation of illuminationFigure A.�� - UV-4 dry zeroing collimator Figure A.�2 - UV-4 dry zeroing collimator, rear view

28

� – power supply Al5.087.326; 2 – charge unit Al5.�2�.�6�; 3 – cable Al6.644.493; 4 – eyeshield Al6.548.035; 5 – UV-4 dry zeroing collimator; 6 – key spanner Al8.896.0�3; 8 – napkin Al8.890.00�-0�; 9 – r6(AA) battery; �0 – Nlts-0.9-� storage battery; �� – YK-3�6 battery tester; �2 – key spanner Al8.392.�00; �3 – soft cover Al6.832.�74-02

Figure A.� – single sta kit

a) Delivery set according to table 2

b) Delivery set according to table 3

� 2 3 4 5

689�0���2�3

4

689���3

29

Figure A.2 – electro-optical function diagram

MG95

image inten-sifier

“ON”

30

� – case Al6.875.�38; 2 – pocket; 3 – �PN93-4 sight; 4 – eyeshield Al6.548.035; 5 – YK-3�6 battery tester; 6 – cable Al6.644.493; 7 – charge unit Al5.�2�.�6�; 8 – UV-4 dry zeroing collimator; 9 – carrying bag Al4.�65.036; �0 – service documentation; �� – soft cover Al6.832.�74-02.

Figure A.3 – Case package chart

4

3

2

�

��

7

6

5

�09 8

3�

Figure A.4 – aiming reticule

32

Figure A.5 – examples of ranging with reticule

running target

Prone target

Half silhouette target

5. D = �000m 6.D = �200m 7. D=�300m

�. D = 400m 2.D = 600m 3. D=800m 4. D=900m

�. D = 270m 2.D = 400m 3. D=530m 4. D=600m

5. D = 670m 6.D = 800m 7. D=870m

�. D = 80m 2.D = �20m 3. D=�60m 4. D=�80m

5. D = 200m 6.D = 240m 7. D=260m

33

� – light filter; 2 – objective lens; 3 – nut; 4 – body; 5 – screw; 6 – cap; 7 – gasket; 8 – collar; 9 – eyeshield; �0 – screw; �� – tumbler “ON”; �2 – cord; �3 – cap; �4 – cap; �5 – handwheel.

Figure A.6 – sight with light filter attached

9

� 2 3 4 5 6, 7 8

�0

��

�2

�3

�4

�5

34

� – washer; 2 – lock screw; 3 – latch; 4 – lock lever; 5 – handle; 6 – bracket

Figure A.7 – night vision sight

�

24 3

5

6

35

Figure A.9 – Landolt ring for estimation of illumination

Figure A.8 – Battery compartment

AG� (G2)

A

2�

600±�0

600±

�0

�00±

0,5

∅500±� ∅300±�

36

Figure A.�0 – plot for estimation of illumination

illumination, lx

ran

ge,

m

37

� – body; 2 –shank; 3 – fabric sleeve

Figure A.�� – uV-4 dry zeroing collimator

�

23

UV-4

38

� – Screw

Figure A.�2 – uV-4 dry zeroing collimator, rear view

�

39

Изделие �ПН93-4. Руководство по эксплуатации на английском языке