Polaroid SX70 manual Function Sequence, Switch Function Table

h- Switch S8 (Figure 2-8 A) is part of the exposure counter operated by the counter wheel. As S7 closes, power is applied, ejecting the dark slide. After the dark slide ejection, the counter wheel turns, opening S8. S8 then remains open until the film pack is removed. When the pack is taken out, S8 closes.

i- Switch S9 is near S8 on the exposure counter assembly. When the counter reaches the 0 position, switch S9 closes and the ECM inhibits the falsh-firing function, so that if an unused bulb is still available it will not be wasted.

j- For an handy summary, see the Switch Function Table.

3. Function Sequence

The following paragraphs describe the sequence in which operate during normal operation of the camera.

a- The operator opens the camera. Switch S6 connects the battery to the camera circuitry.

b- The operator opens the front cover. Switch S7 opens and removes battery power from the camera.

c- The operators open a film pack. (when the Figure 2-8 A S8 - S9 Exposure counter switches

previously used film pack was			removed, a
			SWITCH FUNCTION TABLE
	Switch	Action	Result
	1	closes	Initiates exposure cycle and causes circuitry to take and
			deliver the pictures.
	2	closes	Connects circuitry to take flash pictures.
	3	opens	Initiates «Y», 40 milliseconds delay. (Power down
			solenoid #2 in the flash mode)
		CA closes	Controls power to solenoid #1 (drop current to holding
	4		level).
		CB closes	Signals the ECM to start the motor.
	5	opens / closes	Stops motor both by closing and opening depeending upon
			sequence of action and internal circuitry.
		closes	● Connects the battery to the electronic circuitry when the
	6		camera is open to use.
		opens	● When the camera closed, cuts power from battery.
			When S8 is also closed, it provides power to the camera
	7	closes	when the front power is latched (for dark slide eject). Also
			acts as an interlock during normal picture taking.
	8	closes	Enables (with S7 closed) the circuitry to eject dark slide.
			Opens again after the dark slide is ejected.
	9	closes	Prevents firing flash if film pack counter is on «0».