Polaroid SX70 manual Camera/Shutter Isolation, Flex circuit terminal locations

Figure 3-18 Flex circuit terminal locations

1. Camera/Shutter Isolation

To expedite the repair procedure, it is essential that the malfunction be isolated to either the camera back or the shutter as early as possible in the troubleshooting procedure. The sequence should not be considered inflexible, however.

a. Disassemble the camera to the point where the terminals on the flex circuit are accessible (Figure 3-17).

b. Tack solder a 1000 ohm, 1/2 watt resistor across the VCC and NPN terminals as shown. (This procedure does not apply to mid-cycle shutdown. Refer to the Failure Analysis Charts.)

NOTE : One 10 pad flex circuits, these are the TP6 and TP30 terminals. One 8 pad circuits, these are TP4 and TP21 terminals. One 7 pad flex circuits, where the PNP pad is eliminated, the NPN terminal is located directly adjacent to the VCC terminal. Refer to the inserts in Figure 3-17 to locate the proper terminals.

c. Close S6 and S7 and apply power :

(1)If the camera cycles, the motor and MCC are OK and the shutter is defective.

(2)If the camera fails to cycle, check the motor and MCC by continuing below.