Olympus OM-2S Service Manual
Contents
1.2. APERTURE smurTER RELEASE tever CHARGE LEVER RED WIRE E 10 BACK VIEW OF MIRROR BOX REWIND SIDE BLACK MAIN SWITCH WIRE BOTT M PLATE SCREW ground Pin 36 of the 1 0 IC then switches on the SCR to fire the flash 4 SW104 FP switch side of mirror box Fig 9 Closes when the mirror rises con necting the anode of the SCR to ground The SCR can then switch on when it gets the gate signal 5 SW105 Piezo silencer switch back of front plate Fig 9 When SW105 is closed the piezo buzzer connects to the 1 0 IC Opening SW105 shuts off the piezo buzzer 6 SW201 Self timer switch back of front plate Fig 9 When closed SW201 connects CPU pins 20 to 26 The CPU then selects the self timer mode when the main switch closes 7 SW202 Exposure com pensation switch on under side of SV board Fig 5 Closes when the film speed dial is set to an exposure SPT JOURNAL 7 compensation setting The CPU then provides the sig nal through the I O IC that causes the LCD to flick er 8 SW203 LCD lamp switch side of mirror box Closes when you push the lamp button The CPU then provides the signal through the I O IC to turn on the LCD lamp 9 SW204 Display switch by release plate Fig 1 Closes when you push the release plate part The 1 0 IC now turns on the LCD driver and the CPU turns on the head amplifier Signals from the CPU to
3. 1 Make voltage measure ments with respect to the black V bat wires Fig 23 negative Voltages are then positive with respect to the lack wire All test voltages are negative with respect to body ground 2 With the early main board you can reach IC pins for voltage tests However the pins are covered with sili cone moisture proofing To check pin signals use a needle point probe to poke through the silicone The re vised main board doesn t al low access to the IC pins Not all of the test points mentioned in the troubleshooting are then available Repair shortcuts 1 To clean the shutter magnet MG2 erratic shutter speeds fast speeds too slow shutter hangs open remove the lens and the cover plate at the front bottom of the mirror box You then reach the shutter magnet Fig 12 for cleaning 2 To clean the aperture magnet MG3 erratic tures on program aperture on program too small re move the top cover Then lift aside the section of flex that has the 2 variable resis tors Fig 3 Remove the cemented aperture magnet cover to clean the magnet interface Scope tests main board Note IC failures require replacing the complete main board M2 Because of the part cost and the time re quired to replace the main board you may prefer to send such repairs to the fac tory The following tests may detect a main board failure 1 32KHz oscillator C
4. MAIN BOARD LCD LAMP BUTTON DISPLAY SWITCH dA MOTOR swiTcH E Travel time 2nd curtain 1 Travel time Ist curtain M Amplifier gain Ist curtain brake o Position Ist curtain Position 2nd curtain normally not necessary to adjust preadjusted on new board normally do not disturb SPT JOURNAL 3 ADJUSTMENT VALUES Curtain travel 10 9ms 32mm distance Flange focal distance 46 20 0 02mm flange to pres sure plate rails K factor 13 Release lock voltage 2 6 0 05 0V below this vol tage the mirror locks up Vref 1 78v 10mv Iref 150 1 5mv AV TV voltage 1869 3mv DAC 195 4 Sprocket timing lead edge of a sprocket tooth 21 0 5mm from lead edge of fo cal plane aperture ADJUSTMENT PROCEDURES Note With the top cover removed set the mode using the letter symbols on the mode selector Fig 1 align the appropriate bar on the mode selector with the posi tioning screw Set ISO 100 by aligning the square post on the film speed selector with the detent Fig 4 Sequence 1 Trigger voltage Set manual mode 1 1000 se cond Adjust for an ac curate 1 1000 with A Fig 2 for a faster speed cw for a slower speed 2 Auto xposure Note For slow speeds the camera reads the light re flected from the film To simulate the film s reflec tivity place a piece of film or an 18 neutral
5. When you push the release button the mirror moves to the raised position without releasing the shutter The self LED flickers and the piezo beeps during the 12 second delay The frequen of the LED piezo oscil lator increases around 2 sec onds before the shutter re leases 7 When you turn the film speed dial to an exposure compensation setting the LCD flickers bottom of LCD row 8 Turn the self timer knob in a clockwise direction to turn off the piezo buzzer 9 With the mode selector the battery test position the piezo beeps and the self LED glows to indicate good batteries 10 The button on the wind side of the lens mount turns on the LCD lamp to illumin ate the LCD The lamp stays on 10 seconds after you let up the button The LCD lamp doesn t turn on at the mechanical settings SWITCH LOCATIONS AND FUNCTIONS 1 859101 Main switch bottom of mirror box Fig 10 Closes with the mirror up to signal the release of the Ist curtain 2 SW102 Trigger switch bottom of camera connect ing to TV board Fig 14 Opens when the 1st curtain starts to run to start the ex posure cycle start of inte gration 3 SWI03 X sync contacts bottom of camera connect ing to TV board Fig 6 Closes when the Ist curtain crosses the aperture switch ing pin 37 of the I O IC to FIGURE 9 BACK LCD CONNECTOR SETSCREWS FLASH READY LED SELF TIMER SILENCER
6. DISPLAY switch m ARD LCD DRIVER 1 66 INDICATION E OV EXPOSURE T ENERGIZE SW20S switcH RIBBON FT BOARD FIGURE 23 WIRING PICTORIAL MAIN BOARD 16 SPT JOURNAL GRAY RIBBON os PINK RIBBON PC TERMINAL BLUE BROWN SWITCH ILACK MAIN BOARD PLAP stione THAN TO THE FLEX up RED GREEN WHITE RIBBON A C201 CHARGE RED RIBBON MGI APERTURE MAGNET gt BLUE INR BAER CONTACT war aviv ovr BLUE RIBBON Wm APERTURE CAPACITOR Tw TRIGGER cus SWITCH GRAY 3 YELLOW coo AY BOARD SPT JOURNAL 17 6 Replace the bearing plate for the tension rollers Fig M 7 Replace the 3 mask screws at the front of the shutter block 8 Replace the 3 counter sunk screws at the top of the shutter block 9 Hold the latch disengag ing lever Fig 16 against its spring tension Then ad vance the wind lever to the latched position 10 Charge the shutter cur tains by turning the Ist cur tain gear cew to the latched position turn the Ist cur tain gear from the bottom of the camera 11 If you ve disassembled the transport gear unit reas semble the gears and spring as shown in Fig 18 Seat the transport gear unit and replace the 3 screws 12 Replace the spring lev er Fig 17 Seat t
7. lest position As you move the mode selector to battery test the reset switch closes Sequence 1 Re Hane Y settings ISO 100 Fig 4 b test points Vref TP Fig 7 or Fig 22 to the negative side of the power supply c value 78V d tolerance 10mv 2 Standard current Iref a settings ISO 3200 SV selector Fig 4 fully clocks wise b test points V orange to SV IN yellow on main board Fig 22 value 150mv d tolerance 1 5mv 3 voltage ISO 100 Fig 4 b points Vref to AV TV OUT Fig 22 value 1869mv d tolerance 3mv TIMING OF SHUTTER CURTAINS 1 Adjust the curtain posi tions with the shutter block removed Fig 20 2 Push the armature of the shutter magnet against the LCD LAMP FIGURE 5 TOP VIEW WI Ul cume DISPLAY SWITCH SOLDER FIGURE 6 FRONT VIEW MIRROR BOX REMOVED core Fig 19 The second curtain latch now moves into position to latch the 2nd cur tain 3 Wind on the 2nd curtain until the second curtain gear is held by the second curtain latch charged position The lead edge of the 2nd curtain should now be 0 2mm from the corner of the curtain frame Fig 20 For fine ad justment of the curtain posi tion use the adjusting plate Q in Fig 19 To change the gear timing remove the spring plate from the bot tom of the shutter block
8. more for higher BV If not the head amplifier may be defective 5 Integrator in Check at the integration TP Fig 23 as you release the shutter at an auto setting You should get a trace simi lar to that shown in the pic torial If not the head am plifier may be defective Troubleshooting steps for specific problems 1 Mirror locks up no LCDs no battery test Battery voltage to circuit Check for 3V between the black V bat wire Fig 23 and the red ground wire main board flap Fig 23 No vol tage battery box or wiring Reference voltage Check for Vref at the test point Fig 23 gray wire No voltage variable resistor H poor wiper contact C108 Shorted Fig 21 or IC102 de fective A voltage higher than L8V may indicate im proper adjustment of Vref or a defective ICIO2 Clock signal Check fo the 32KHz sine wave signal at the crystal lead Sig 23 the signal should be present whenever power is supplied No sig nal C115 crystal or IC104 defective replace the main board Check for the 500KHz CPU clock signal at the end of R110 Fig 23 square wave You should get a pulsating signal until you close the display switch you should then get a steady square wave signal No sig nal R110 or 1C104 defec tive 2 Mirror locks up LCDs and battery test ok 0201 MG1 C201 With the mirror locked up short the red wire main board flap Fig 23
9. over the lower pivots of the winding rollers Then push down the second curtain rol ler to disengage its pinion from the second curtain gear Turn the second cur tain roller to change the timing 4 Wind on the Ist curtain until the first curtain gear is held by the first curtain latch The left hand edge of the first curtain bar should now be 02mm from SPT JOURNAL S the corner of the curtain frame Fig 20 1 over lap 5 For a fine adjustment of the curtain position use the adjusting plate P in Fig 19 To change the gear timing slightly push down the first curtain roller while lifting up the first curtain gear Once the pinion and gear disengage turn the first curtain roller to posi tion the bar OPERATING INSTRUCTIONS 1 The der LCD turns on when you depress the re lease button part way The LCD remains on 2 minutes 2 Set the mode with the mode selector under the re wind knob In the program mode the LCD turns on at the top of the display The bar LCDs show the shutter speed that the cam era will automatically select Set the smallest full range of apertures 17 you don t set the smallest the camera will still provide the proper exposure However if the aperture is too large for proper posure the over LCD flickers at the top of the display and the piezo beeps Also the iris symbol LCD flickers showing which way
10. tegration signal to IC103 10 On auto modes the in tegration signal controls the shutter speed The D A converter in the CPU pro vides a voltage that corres ponds to the film speed at one input of CP1 in the 1 0 IC the integration signal provides the other in put When the integration voltage surpasses the ISO voltage the CP1 output switches low The low sig nal at pin 32 of the I O IC switches off 0202 Q202 shuts off the current through MG to release the 2nd curtain 11 On manual speed set tings the manual speed tim er in the CPU controls CP1 When the trigger switch opens the timer counts clock pulses The timer ends the exposure by switch ing CPU pin 28 high The high signal causes CP1 to switch 1 pin 32 low shut ting off Q202 to release the 2nd curtain 12 The FT circuit on the FT board Fig 1 acts to suppress rapid BV changes during indication 0401 conducts during indication to charge C402 When the main switch closes Q401 switches off BV fluctua tions can then affect the ex posure during direct meter ing DISASSEMBLY HIGHLIGHTS Settings for disassembly unimportant Locations of left hand threads screw holding mir ror charge lever screw hold ing charge cam assembly Fig 16 Sequence 1 bottom cover 4 screws FIGURE r BOTTOM VIEW RE REMOVED ASE M BEARING PLATI K AND MD SWITCH BLOCK FIGURE 18 UNDERSIDE OF TRA
11. 1 Turn the wind lever un til the charge cam clears the large cutout at the bottom of the body casting 2 Seat the shutter block from the top of the body casting Make sure the pur ple wire passes through the slot between the screw holes at the top of the shutter block 3 Seat the wind gear side of the shutter block first Then manipulate the mirror return lever until it clears the body casting lip The shutter block will drop down until it s blocked by the release latch S1 lever Fig 15 Move the release latch toward the shutter lock magnet until the shut ter block seats fully 4 The reset lever Fig 15 disconnects the release latch for the mechanical settings and the reset operation Connect the short end of the reset sprihg against the tab at the underside of the reset lever Connect the long end of the reset spring to the edge of the body cast ing hole Fig 15 5 Replace the 3 counter sunk shutter block screws at the bottom of the body cast ing SPT JOURNAL 1S SY BOARD LCD LAMP REEN RIBBON TY BRUSH av BLACK BLACK RIBBON ORANGE BATTERIES 2 5 0 2V CM 7 DAC z LET e n D xt MAIN SWITCH fuas gece UP ANA wen onn fi E s ON memory X POWER GO HIGHI CENT 4 Y b 92 sem Vus
12. 8 LCD inoperative other functions o k Note If just certain seg ments are missing check as described in step 9 If none of the LCD segments will turn on check as follows 1 103 Loosen the 2 setscrews hold ing the LCD flex connector Fig 9 mirror box doesn t have to be removed Lift out the LCD flex connector 1 uncover the test points Fig 8 Use a needle point probe to poke through the insulation LCD power low with LCD on VM 18V LCD off LCD oscillator ose signal 12V LCD on If you re not getting the LCD signals with the dis play switch closed check the display switch for poor contact by shorting between the 2 green SW204 wires no signals IC103 or CPU defective LCD pressure contact Clean the LCD flex con tacts Fig 8 and the rubber conductor for the LCD the flex contacts come against the rubber conductor Then slip the LCD flex con nector into place between the pressure bar and the rubber conductor Try ad justing the LCD position to see if any of the LCDs will turn on 9 LCD segments missing other operation o k Poor contact LCD connector To check connect a hook up wire to the LCD test point Fig 8 you can reach the test point without unfolding the flex Connect the hook up wire to the Vbat land Fig 23 Then turn the mode selector toward the battery test position Just before the mode selector reaches BC it closes the re set
13. to the Vref TP gray wire Fig 23 If the shutter then re leases 0201 and C201 are o k Or with the mirror down short the red wire to the Vref TP you should hear a click as the shutter lock magnet MG1 separates When you then push the release the shutter should operate No click check MGI open coil dirty interface Fig 12 and C201 Fig 21 open shorted poor solder Main switch Check at the pink wire to the main board Fig 23 With the mirror down you should measure with respect to body ground With the mirror up you should measure 3V 0V with respect to body ground Alternately check with an ohmmeter you should measure direct con tinuity to body ground with the mirror up If not check the main switch Fig 10 for poor contact and the pink wire for poor solder Note The problem can also be caused by chattering in the main switch Check with scope The trace at the pink wire should switch low when you release the shutter the voltage stays high if the mirror locks up ragged trace indicates chattering 1 103 Check the signal at the red MGI wire main board Fig 23 as you release the shutter The voltage should switch low If not IC103 may be defective 3 Shutter stays open Note Check the following if the shutter hangs open in all electronic modes manual and auto If the shutter hangs open only in the auto modes the
14. 01 CONTROL sl 202 FLASH LED BAT LOW TO CHARGE C201 SPT JOURNAL 21 measure with re spect to body ground With the shutter open you should measure 0 If you measure 3V with the shutter open check the trigger switch by disconnecting the brown wire Then check the con tinuity between the brown wire and body ground Proper operation no con tinuity with the shutter open direct continuity with the shutter cocked If you measure direct continuity with the Ist curtain re leased the trigger switch isn t opening or C113 Fij 8 is shorted RV104 R107 With the shutter held open electronically short the trig ger switch TP brown wire main board flap Fig 23 to the black Vbat wire at the main board flap If the shutter then closes the problem may be poor solder to R107 Fig 7 or poor wip er contact to RV104 A in Fig 2 You can check RV104 and R107 by measur ing the resistance between pins 42 and 43 of IC103 Fig 23 You should mea sure around 100K de pending on the setting of RV104 0202 With the shutter open short the MG2 TP gray wire main board flap Fig 23 to the black Vbat wire at the main board flap The shut ter should close If not 0202 Fig 21 may be short ed Note If the problem occured only after reas sembly check for reversed gray wires at the main board flap Fig 23 Also soldering the wires to the mai
15. IONS AND FUNC TIONS OF MAGNETS 1 MG1 Hybrid shutter lock magnet on TV board Fig 12 Repels its armature to release the 1st curtain after the main switch closes 2 MG2 Electromagnet for shutter speed control on TV board Fig 12 3 MG3 Hybrid aperture magnet top rewind side of mirror box Fig 10 Repels its armature to stop the phragm on program mode BASIC CIRCUIT OPERATION 1 The 32KHz oscillator in the CPU turns on as soon as power is supplied The S00KHz clock in the CPU now turns on and off to conserve power Every MEAD 27 AMPLIFIER Lm RED HA SIGNAL FIGURE 14 FRONT VIEW TV BOARD REMOVED 300m the clock turns on If checking the clock a scope the signal appears to pulsate When you close the display switch the clock signal switches on every 100ms on a scope the trace appears steady The LCD now turns on 2 To turn on the LCDs the CPU supplies the oscillator signal to the I O IC pin 52 The I O IC then supplies the signals that turn on the LCD driver LCD power low LCD oscillator and VM 12V Fig 23 The signals that control the LCD read out come from the CPU LCD signal bus Fig 23 3 The CPU also supplies the signals that turn on the head amplifier IC101 the HA and HB signals Fig 23 When either signal is high 1 101 turns on and measures the light through reflex mirror off submirror to SPD The HA and HB sig
16. Journal amp Service Notes OLYMPUS OM2 S PROGRAM JULY AUGUST 1988 Table of Contents Olympus OM2 S Program service articles in this issue were prepared by Larry Lyells unless noted Display Ad Rates Full page 5225 Half page 125 Quarter page 875 800 525 9710 303 698 1820 outside continental USA and in Colorado SHUTTER MULTITEST EV 400 MULTITEST Seven tests with every gt Measures sync delay time Direct measurement ofin Includes Shutter operation Test leat and focal plane tegrated light at film plane COUPE 1 Opening shutter speed shutters T stop measurement Super 8 probe id shutter speed Universal probe adaptor Light meter test 645 adaptor losing shutter speed Seif contained light Curtain rave me Crystal controled source provides EV11 13 S Closing curtain travel time precision and 15 intensities Price 1385 00 6 Bounce 7 Sync Price 1385 00 MULTISYSTEM COMBINED PRICE 2 660 SHIPPING Call about current discounts SPECTRON INSTRUMENT CORPORATION 1342 West Cedar Avenue Denver CO 80223 303 744 7088 SPT JOURNAL 1 Batteries 2 576 positive ground Similar models other cameras in OM series mech anically similar Fig 1 top cover removed Fig 2 front view leather and front mirror box light trap removed Fig 3 top view rewind side Fig 4 top view wind side Fig 5 top view wi
17. NSPORT GEAR UNIT 2 top cover wind lever pry off cover remove screw wind shaft spacer nut spring base with ball detent lever spring lever washer unscrew rewind knob remove mode selector lever retaining ring remove film speed dial cemented nameplate screw spring SV plate dial Note The larger spring coils go down toward the top cover 4 top cover screws Note As you lift off the top cover the back latch spring the rewind button with the rewind button spring and the rewind but ton rod will be loose The rewind button spring fits over the outer diameter of SPT JOURNAL 11 the rewind button The re wind button rod goes with the smaller diameter down 3 unsolder 4 top cover wires from main board flex pink green red blue Sequence to remove mirror box 1 unsolder purple wire da ta back contact from main board flap Fig 23 2 unsolder all wires of rib bon connectors A and B Fig 23 6 wires in ribbon A 5 wires in ribbon B 3 unsolder yellow LCD lamp wire from main board Fig 23 4 remove 2 screws white holding SV board corners by pentaprism Fig 4 5 lift aside SV board Fig 5 leave wires attached 6 remove screw holding black wire solder lug LCD lamp ground wire Fig 5 7 remove screw holding display switch Fig 5 8 lift out LCD lamp light guide block Fig 5 9 remove mode selector Fig 1 retaining
18. TCH MGI SHUTTER LOCK MAGNET GRAY 0202 BASE RESISTOR ORANGE RIBBON B BULB SWITCH 205 ORANGE Ov CHARGED 14 SPT JOURNAL from mirror box bottom plate 3 screws 2 holding clips note loose blue fil ter between photocell lens and head amplifier the lens is also loose Sequence to remove TV board Note If you re replacing the TV board unsolder all the wires from the TV flex Fig 22 If you re just re moving the TV board to reach the shutter block it s only necessary to unsolder the black negative battery wire 1 unsolder wires 2 unsolder trigger switch lead from TV board Fig 22 3 pull blue and white wires loose from cement on TV flex 4 remove 2 screws holding TV flex 5 remove 2 screws holding TV board 6 remove TV board and flex passing the TV flex and wires between the cur tain rollers 7 remove TV gear Sequence to remove shutter block l remove mirror box and TV board 2 remove tripod socket 2 screws 3 remove mirror charge lever Fig 16 1 left hand screw 4 remove shoulder screw from release link Fig 16 lift aside link as shown in Fig 17 5 remove spring lever Fig 17 1 shoulder screw 6 remove transport gear unit 4 base plate Fig 17 and Fig 18 Note The large screw for the 4 base plate goes into a threaded post Since the post rather than the screw may come loose unscrew th
19. back closed to disconnect the red wire con tact from ground LOCATIONS AND FUNC TIONS OF ICs 1 1 101 Head amplifier on main board at bottom of mir ror box Fig 10 and Fig 13 Has two built in SPDs aver age and spot Fig 13 for measuring the light passed through the mirror and re flected down by the submir ror indication With the mirror up IC101 measures the light from the 1st cur tain fast speeds or from the film slow speeds 1C101 provides two out puts BV OUT to IC102 for indication and IN TEGRATION OUT to IC103 for exposure 2 1 102 Input IC on main board top rewind side Fig 7 Receives the BV OUT signal from IC101 as well as the SV TV and AV values An A D converter in IC102 converts the analog signals to digital signals The digi tal signals are supplied to the multiplexer in the CPU on a time shared system 3 1 103 Input output IC top of main board at rewind side Fig 7 Controls the magnets according to signals received from 1 101 and 1 104 4 1 104 CPU top of main board at wind side Fig 8 Includes the oscil lator and the D A converter Provides the control signals to the 1 0 IC and the LCD signals to the LCD driver 5 1 105 LCD driver un derside of board at top wind side Fig 8 Controls the LCD segments according 10 signals received from the CPU The I O IC provides the signals that turn on the LCD driver LOCAT
20. d overtravel insufficient space gap between K plate B and releasing claw Fig 16 MG2 0202 R202 Short the MG2 signal con nection gray wire main board flap Fig 23 to body ground as you release the shutter the shutter should stay open as long as you hold the short If not check MG2 Fig 12 for an open coil or dirty interface If MG2 is o k the problem may be an open R202 or Q202 Fig 22 1 103 Check at the MG2 signal land gray wire Fig 23 You should measure When you release the shut ter the signal should switch high around 24V to turn 0202 If not IC103 may be defective 6 No change in manual speeds fast speed only all manual speed settings man ual LCD indication reads low below index TV resistor Check the voltage at the green wire TV brush at the top of the main board Fig 23 The voltage should change as you change the manual speeds lower vol tage at faster speed settings Or disconnect the green wire and measure the resis tance between the green wire and the blue TV wire at the main board flap Fig 23 Approximate resistance values 1 second 18 8K 1 15 11 6K 1 60 8K 1 500 2 7K No change or high read ings clean the TV tesistor under TV gear Fig 12 7 Shutter delivers only 1 second at manual settings TV resistor connections Check for Vref at the blue TV wire Fig 23 Check the blue wire solder connections
21. e large screw last If the post unscrews it stays with the 4 base plate Fig 18 Hold the post and remove the screw Then replace the post in the body casting 7 remove MD switch block Fig 16 2 screws leave wires connected 8 remove lower bearing plate for tension rollers S plate Fig 17 1 Screw 9 remove trigger switch plate Fig 14 2 screws 10 remove 3 countersunk screws bottom of body cast ing that hold shutter block Fig 17 11 remove 3 screws at front of shutter block mask screws Fig 6 12 remove 3 countersunk screws at top of shutter block 2 on wind side 1 on rewind side 13 advance wind lever unti the charge cam Fig 17 clears the bottom of the shutter block 14 hold the release latch S lever Fig 15 against its spring tension toward the shutter lock magnet and li shutter slightly Note You can reach the re lease latch through the cutout at the bottom of the body casting Fig 17 15 pull bottom of shutter block slightly toward the front of the body casting un til the mirror return lever Fig 20 clears the lip at the bottom of the body casting 16 lift out shutter block toward top of body casting Fig 19 Note Push up the shutter block from under the wind gears while you re moving the mirror return lever Fig 20 Shift the shutter block slightly to the right and to the left until the levers clear Reassembly highlights
22. e cutout in the body cast ing Make sure the charge lever on the mirror box passes to the front of the curved end of the mirror charge lever bottom of camera Fig 16 4 Hold the mirror box firmly in place and advance the wind lever to charge the mirror Then check the re lease you should get bulb operation If not lift the mirror box far enough from the body casting to dis engage the TV gear Turn the TV gear until you see both dots 5 Tighten the front plate screws diagonally indicated by the sequence numbers Fig 2 Tighten the 2 upper mirror box screws by the eyelens last 6 Position the wires of rib bon B to the back of the camera Position the wires of ribbon A to the front Fig 11 7 Seat the lamp guide unit as shown in Fig 5 Replace the display switch 8 Pass the ribbon A wires under the front corner of the main board Fig 4 Pass the ribbon B wires under the section of flex that mounts 1 105 Fig 4 9 Replace the SV selector Fig 4 10 Solder the wires to the top of the main board 1 green from AV board FIGURE 21 1 green from ribbon 1 yellow from LCD lamp 11 Solder the wires to the 1 105 board Fig 12 Replace the sulator on the under the main board flap Solder the wires to tbe main board flap Caution Heat the solder con nections just long enough for the solder to flow Holding on the hea
23. gray card on the face of the test in strument probe Set auto mode ISO 100 1 5 6 11 Adjust the ex posure with B Fig 2 cew for a longer exposure cw for a shorter exposure Then check the exposure ac curacy in the program mode separate adjustment 4 8 JOURNAL FILM SPEED SELECTOR 150 100 FIGURE 4 VIEW WIND SIDE SV BOARD 3 LCD readout auto Set auto mode ISO 100 5 6 Adjust C Fig 2 until the LCD reads 1 60 4 LCD readout manual Set manual mode ISO 100 1 60 5 6 EV11 Adjust D Fig 3 until the LCD indi cates proper exposure bar aligns with center line ADJUSTMENTS NOT NORMALLY REQUIRED Note The standard voltage and current values are pre adjusted on a replacement main board Check if you re unable to adjust the auto exposure if the manual speeds don t agree with the settings or if you can t ad just the LCD indications To adjust unsolder the wires from the main board Fig 3 Unfold the flex to reach the variable resistors Fig 7 You can check and make the adjust ments with the wires discon nected Procedures 1 Connect power supply between the V bat land black wire Fig 22 and body ground 2 Before each measure ment turn the power supply off and then on to reset the circuit Or if the mode sel ector is still installed Fig 1 momentarily set the battery
24. he release link Fig 16 Make sure the tab at the end of the release link fits within the fork of the mirror release lever Fig 15 Fit the brass pin of the magnet lever against the Te lease link tab as shown in Fig 16 Replace the release link shoulder serew TROUBLESHOOTING Behavior without batteries mirror locks up except at mechanical speeds Typical current draw standby 12 micro amps or less LCD on 0 5 LCD lamp on Battery check beeper 8 Frequently repaired sections 1 Mirror fails to rise mechanical or electronic set 18 SPT JOURNAL tings because of a dirty or binding mirror governor Fig 10 It may be necessary to replace the governor assembly MD switch assembly 21192200 2 Erratic auto exposure or meter readings You can usually correct by cleaning the SV board Fig 4 and the film speed selector 3 Erratic high speeds or no exposure Clean the shutter magnet MG2 see Repair shortcuts Also check the operation of the Ist curtain release lever K plate B Fig 16 Check with the mirror box installed After you cock the shutter K plate B should latch on the highest step of K plate There should now be a space gap of at least 0 2mm between the end of K plate B and the releasing claw visible through the body cutout Fig 16 If you have to increase the space gap bend the adjustment lug on K plate B Techniques for voltage measurements
25. heck at the lead of the quartz crystal indicated in Fig 23 You should get the 32KHz sine wave as soon as you apply power to the cir cuit No signal indicates a defective quartz crystal or a defective CPU 2 Clock Check at the end of R110 indicated in Fig 23 With the LCD off the clock is in the standby mode for energy conservation The 500KHz square wave then pulses on and off at a rate of 300ms You may have to adjust the scope s trigger control to see the pulsing square wave Next push the release plate part way to close the dis play switch the clock sig nal should now appear steady When the display switch opens the clock sig nal should again pulse this time at a faster rate of 100ms If you set the bat tery test mode or if you close the main switch mirror up the clock signal should again stop pulsing After the display switch has been open 2 minutes the clock should return to the standby mode pulsing at a rate of 300ms and the LCD should turn off A failure of the clock signal indicates a defective CPU 3 Digital to analog convert er Check at the DAC TP 23 You should get the sig nal shown when you close the display switch manual mode If not either the CPU or the input IC may be defective 4 BV Check at the BV TP Fig 23 using either a scope voltmeter You should get a changing analog voltage ac cording to light level when you close the display switch
26. main board may be defective integration signal You can check the integration signal at the in tegration TP Fig 23 you should get the signal shown when you release the shutter the actual shape varies with BV Trigger switch Check at the trigger switch TP brown wire main board flap Fig 23 With the shutter cocked you should SPT JOURNAL 19 20 HEAD AMPLIFIER 1 101 t OFFSET 15 HA 3V EXP LCD 23 1C 103 B a3 1 1000 AD emt atum TRIGGER 89102 589206 MODE LCD SIGNAL BUS INTEGRATION gt SIGNAL TP LCD POWER LCD OSCILLATOR 12V LCD ON 18V LCD OFF osc TP S uz IC 105 LCD DRIVER FLASH SIGNAL FIGURE 24 SCHEMATIC 20 SPT JOURNAL 12 250 C1034C104 320 3200 C103 INTEGRATION CAPACITORS 5 V BAT PINK BOARD Qui IREF ADJ ON W MAIN SWITCH OPEN OFF W MAIN SWITCH CLOSED SELECTION cm LI ae 5 DAC TP 195 8MV EE ADJ M AWA MANUAL LCD ADJ AUTO LCD ADJ MA AUTO LISV 186 READOUT T 3658135 AV ou ES DAC 8 CONTACT 5 22 5105 LAMP 1 5 22 21 GRAY SILENCER V BAT MG3 ON ane 02
27. n board flap may have disturbed the R107 solder connections 4 Diaphragm always stops down fully on program Aperture magnet MG3 Cock the shutter Then 22 SPT JOURNAL short the red MG3 wire main board flap Fig 23 to body ground You should hear a click as the aperture magnet repels its armature When you then release the shutter the diaphragm should remain fully open No click MG3 defective or dirty in terface Q101 C114 Cock the shutter Then short pin 9 of IC103 to the black Vbat wire Fig 23 You should hear a click as the aperture magnet repels its ar mature No click 0101 Fig 21 or C114 Fig 23 open or poor solder Also check the C114 wires blue and red Fig 23 Note Depending on the main board the 03 pins may not b accessible You can then make the tests at the leads of 0101 on the underside of the flap Fig 21 10103 Check the signal at pin 9 as you release the shutter The signal should pulse low the low signal turns on Q101 No pulse 03 defective 5 Shutter delivers no expo sure curtains cross aperture together Ast curtain release If the curtains cross the aper ture together on mechanical operation as well as electronic operation check the Ist cur tain release Frequently re paired sections 3 and the mirror charge lever Fig 16 The Ist curtain latch may not be engaging the Ist curtain gear insufficient win
28. nals high or low also de SPT JOURNAL 9 termine the mode average or spot for indication direct for exposure The high HB signal also turns on the in put IC IC102 4 ARI in the head ampli fier selects the integration capacitors C103 and C104 according to the film speed With the shutter charged the trigger switch closes Pin 8 of the head amplifier switches low closing the in ternal switch indicated at the output of For ISO speeds of 12 through 250 ARI charges both capaci tors For ISO speeds of 320 through 3200 charges C103 5 1 101 supplies the analog BV signal to 02 IC102 converts the BV voltage to a digital signal The A D converter in IC102 also con verts the TV AV and SV inputs to digital signals All signals go to the multiplexer in the CPU on a time shared system the D A select cir cuit in the CPU selects which of the values is input to the multiplexer The CPU stores the information in the RAM Fig 23 The RAM supplies the signals to the LCD driver The LCD driver turns on when it re ceives the LCD power LCD oscillator and VM signals from the 1 O IC Fig 23 6 When you fully depress the release the diaphragm starts closing The BV sig nal now decreases as the SPD sees less light On pro gram mode the CPU con trols the diaphragm opening through the 1 0 The D A converter in the CPU converts the digital dia phragm signal t
29. nd side SV unit removed Fig 6 front view mirror box removed Fig 7 top view of mirror box rewind side under ide of main board Fig 8 top view of mirror box wind side underside of IC105 board Fig 9 back view of mir Tor box wind side Fig 10 back view of mir Tor box rewind side Fig 11 top view of body mirror box removed Fig 12 top view TV board Fig 13 bottom section of main board removed from mirror box head ampli fier Fig 14 front view TV board removed Fig 15 front view TV board and tripger switch removed Fig 16 bottom view mir box removed Fig 17 bottom view re lease link and MD switch block removed Fig 18 underside of trans port gear unit Fig 19 shutter block front view Fig 20 shutter block back view 2nd curtain charged Ist curtain released Fig 21 component iden tification main board flaps Fig 22 wiring pictorial TV board Fig 23 wiring pictorial main board Fig 24 schematic OLMPUS OM2 S PROGRAM FT BOARD MODE SELECTOR FIGURE 1 TOP COVER REMOVED SELF TIME RING Figure 2 view ADJUSTMENT LOCATIONS Trigger voltage 1 1000 Auto exposure B LCD readout auto c CLCD readout manual D Standard current Iref E AV TV voltage F Digital to analog voltage DAC G Reference voltage Vref H Mirror cam 1 Submirror angle Je Reflex mirror angle K
30. o an analog voltage the voltage provides the reference input to a comparator The BV signal provides the second input When the BV voltage drops below the reference voltage the comparator output switches low Pin 9 of the 1 0 IC now switches low turning on Q101 C114 dis 10 SPT JOURNAL FIGURE 15 FRONT VIEW TV BOARD AND TRIGGER SWITCH REMOVED RELEASING CLAW CHARGE CAM ASSEMBLY 2 LEFT HAND 16 charges through MG3 to stop the diaphragm 7 Next the mirror moves to the up position and closes the main switch The CPU now supplies the MGl enable sig nal to the 1 0 IC Pin 8 the 1 0 IC switches low turning on Q201 As C201 discharges through MG1 separates and releases the Ist curtain 8 The trigger switch opens RELEASE LINK K PLATE B BOTTOM VIEW MIRROR BOX REMOVED MD SWITCH BLOCK MIRROR CHARGE LEVER ADJUSTMENT iu as the Ist curtain starts to run Pin 30 of the 1 0 IC switches low signaling the CPU to start integration Pin 34 of the CPU switches high to lock the exposure information in memory 9 Opening the trigger switch also starts the direct metering Pin 41 of the 1 0 IC switches high opening the switch at the output of ARI in the head amplifier Now AR2 in the head am plifier charges the integra tion capacitors according to the current through the SPD AR3 amplifies the output and provides the in
31. ring 10 lift out brass shoulder bushing goes under mode selector shoulder up 11 lift mode switch board free of rewind shaft housing 12 lift FT circuit board Fig 1 free of camera body held by double sided tape 13 remove cover plate front bottom of mirror box uncovers SW4 Fig 2 14 unsolder blue and white wires from SW4 Fig 2 15 unsolder red wire from TV board Fig 22 12 SPT JOURNAL FIGURE 19 SHUTTER BLOCK FRONT VIEW FIGURE 20 SHUTTER BLOCK BACK VIEW 16 remove right and left front leather 17 remove 2 white screws top of camera 1 on each side of eyelens 18 remove 5 front plate screws 19 lift out front plate mir ror box assembly Fig 9 Reassembly highlights 1 Set the shutter speed ring on the mirror box to bulb Also set the TV gear Fig 12 to bulb At bulb a dot on the TV gear points to the front of the camera you can see two TV gear dots at bulb To quickly find bulb first cock the shutter Then depress the release plate and turn the TV gear until the bulb latch Fig 12 moves toward the shutter gears 2 Make sure the red wire Fig 10 as well as the blue and white SW4 wires will be accessible at the front of the mirror box after reas sembly 3 Charge the shutter The mirror box should be re leased with the mirror down As you seat the mir ror box pass the shutter re lease lever Fig 10 through th
32. switch All the LCD segments should now turn on the segments should stay on when you move the mode se lector to other settings as long as the test point con nects to Vbat If any seg ments are missing loosen the 2 setscrews holding the LCD connector Fig 9 Lift the LCD connector from the LCD Fig 8 to clean the flex contacts 10 No change in LCD or auto speeds as you change diaphragm settings AV resistor Disconnect the green AV brush wire from the main hoard 23 Measure the resistance between the green wire and the gray AV wire main board flap Fig 23 Typical values 716 178 8K OTHER COMMENTS 1 Because of the price of the main board and the time involved in folding and fit ting the flex some consider main board replacement un economical and send the re pair to the factory Main board ZC486900 2 Other part numbers top cover ZC476900 leather wind side CE833200 leather rewind side 558300 focusing screen CB158700 or governor 71183500 LCD lamp assembly 2480600 shutter magnet 21175600 shutter lock magnet 21178500 wind lever cover 594000 cover plate film speed dial CE841000 transport gear unit 23175300 spring transport gear unit Fig 18 CA885100 4 knob CE841500 rewind knob pin for crank CA873000 rewind crank ZJ184300 rewind crank flat spring ZC511700 SPT JOURNAL 23
33. t too long may loosen the components on the underside of the flex section Sequence to remove main board unsolder remaining wires from main board flap Fig 23 2 unsolder yellow and orange wires from IC105 board and green AV board wire from top of main board Fig 23 3 remove 2 screws top of main board that hold eyelens remove eyelens block 4 remove flash ready LED Fig 9 1 screw loosen 2 setscrews hold g LCD connector Fig 9 lift LCD connector from mirror box Fig 8 6 unsolder wires by self timer switch Fig 9 2 red blue black 7 remove self timer lencer switch brush discon nect spring remove brass screw Fig 9 8 remove screw holding main board to back of front plate Fig 9 9 disconnect lower end of pulley spring Fig 9 10 free main board from back of front plate held by double sided tape 11 unsolder black main switch wire bottom of main board Fig 10 12 remove screw holding mirror box bottom plate screw in lower right hand corner Fig 10 13 lift out mirror box bot tom plate together with main board 14 separate main board SPT JOURNAL 13 RED MGI 2 LOCK MAGNET CHARGE P RIBBON A TRIGGER SWITCH BOTTOM OF SHUTTER TV BOARD CAMERA MAGNET HEAD nen BLACK AMPLIFIER FIGURE 22 WIRING PICTORIAL TV BOARD BLACK V BAT swios TRIGGER SWI
34. the LCD driver determine which segments turn on 10 SW205 Bulb switch at underside of TV gear Fig 11 Closed at the mechani cal settings bulb and 1 60 With SW205 closed the CPU does not provide the signals to turn on the LCD and to energize the magnets Operation is mechanical 11 SW206 Mode switch Fig 1 Selects the mode BC A M or program by connecting the proper CPU pin to the mode select cir cuit at pin 19 With pin 19 open the circuit selects pro gram 12 Reset switch Contact mode selector next to BC contact Turning the mode selector to the battery test position first closes the reset switch to clear the cir cuit The reset switch also cancels other circuit func tions 13 SW4 Motor switch bot tom front of mirror box Fig 2 With the mirror down SW4 connects the blue wire contact of the MD block to the white wire con tact With the mirror up SW4 connects the blue wire contact to ground 14 U SW Back cover 8 SPT JOURNAL TV BOARD FIGURE 11 VIEW OF BODY MIRROR BOX REMOVED WHITE sray BROWN RED YELLOW BLACK RIBBON B ORANGEG PINK BLUE GREEN MG SHUTTER MAGNET 12 TOP VIEW TV BOARD TV GEAR MGI SHUTTER LOCK MAGNET TENSIONING LEVER switch bottom of camera re ind side Fig 16 Closed with the back open connect ing the red wire contact of the MD block to ground Open with the
35. to turn the diaphragm set ting ring Metering on pro gram modt is center weight 3 Set the A mode for erture preferred control The prgm LCD turns off but the bar LCDs still show the shutter speed that will be automatically set If the aperture is too large for proper exposure the over LCD flickers and the piezo beeps Metering is center weighted 4 In the M manual mode the speeds are controlled by the setting on the shutter speed setting ring The 6 SPT JOURNAL FIGURE TOP VIEW OF MIRROR BOX WIND SIDE camera selects spot metering the metering area is re stricted to the microprism spot on the focusing screen At manual the LCD gives a center the needle pattern When the bar pattern aligns with the pointer the controls are set for proper exposure 5 Shutter speeds of 1 1 1000 are electronically con trolled Without batteries the mirror locks up moves to the raised position without releas ing the shutter To return the mirror install fresh bat teries or set a mechanical speed 1 60 or bulb mark ed in red on the shutter speed ring To set the mechanical speeds depress the lock tab on the front corner of the lens mount and turn the shutter speed ring The camera will oper ate at the red settings with out batteries 6 To set the self timer lift the tab on the self timer ring Fig 2 Then turn the ring counterclockwise
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