Disassembly Highlights
Control positions: unimportant
bottom cover and top cover (loose ball detent and compression spring under main switch)
front-plate leatherette
front decorator plate (3 screws) at front of camera (a slit at the top of the front decorator plate allows you to spread the plate to clear the lens-mounting ring; lens-latch button will be loose)
unsolder wires marked with a check in Fig. 5
motor-drive coupler at bottom of wind shaft
6 screws holding battery compartment
2 circuit-board screws, rewind side at top
unscrew 3 screws holding speed-selector assembly (one screw also supports the auto latch which stays with the speed selector; another screw also holds the speed-selector detent remove the detent screw that's closer to the front of the camera)
photocell circuit board, eyelens frame, and eyelens
4 front-plate screws
front-plate/mirror-box assembly
spring that seats around bushing at bottom of shutter (one end of spring is now loose this end connects against side of body casting)
screw and bushing holding mirror-release link at bottom of shutter assembly
3 shutter-retaining screws at front of front plate
separate shutter from front-plate assembly
Figure 1: Top cover removed
Figure 2: Bottom cover removed
Figure 3: Shutter assembly
Figure 4: Mirror box
Figure 5: Wiring pictorial
Troubleshooting
Behavior without batteries: shutter will not release.
1. Shutter will not release, LEDs operate.
Shorting pin 1 of IC4 to ground should turn on the LED display. If not, IC4 may be defective.
The voltage at pin 4 of IC4 should drop from 3V to 0V when you fully depress the release button. If not, clean and/or reform release switch S2 (under speed selector).
Shorting pin 8 of IC4 to ground should release the mirror. If not, IC4 is defective. If so, IC4 is good; IC3 may be the problem.
2. Shutter hangs open on auto, works properly on manual.
Changeover switch S8: At the brown wire to the top of the flex circuit, you should measure 3V at the auto setting and 0V at the manual settings. No voltage at auto indicates poor contact of changeover switch.
CdS photocells: Check the CdS cells and the wiring to the photocell circuit board.
Film-speed brush: Clean and/or reform the brush contacts of the film-speed brush in the speed selector.
Reset switch S4: Check S4 for poor contact. You should measure 0V at the blue wire with the shutter released and 3V with the shutter cocked. No voltage at blue wire indicates a need to reform and/or clean S4.
3. Shutter hangs open on manual, works properly on manual.
Mirror-release magnet Mg2 and release capacitor C6: Shorting between the negative lead of C6 and pin 9 of IC4, Fig. 5, should release the mirror. If not, either the coil of Mg2 is open or C6 is defective. Check the Mg2 coil by measuring the resistance between the black ground wire and the brown wire at the bottom of the camera. You should measure around 12 ohms.
Variable resistor C, poor contact.
Orange wire to variable resistor C, poor solder.
Changeover switch, poor contact.Write your text here...