Mamiya ZE-2 - Electronic Circuit, Switching and Trouble Shooting; Outline of Electronic Circuit at AE; Check and Adjustment of each Switch; Outline of Manual Circuit

8. Electronic circuit, switching and trouble shooting
8-1 Outline
of electronic circuit at AE
8-2 Check and adjustment of each switch (Main SW memory SW, reset SW and
103 winder SW).
Please refer to the ZE service instruction book chapter "6" page 31 to 38
for above two.
8-3 Outline of manual circuit
l . Oischarge of Cl2 capacitar
When depressing the shutter release button slowly, the first blind of
the shutter begins to run when the mirror approaches the top of its
movement.
The
memory switch is turned off right befare the mirror starts to
operate and then the current flows into the TR8 circuit through the
ICl - 9 pin.
The Cl2 is discharge with operation of the TR8.
At this time also the current flows into TR7 circuit.
2. Charge of Cl2 (Begin to count the exposure time)
When the first blind of the shutter begins to run, the trigger switch
of the shutter exposure time control circuit is turned off.
By this switching the current to the TR8 circuit is cut off.
Thus the Cl2 begins to charge for counting the exposure time by the
TR8 switches off.
3. When reaching to the predetermined voltage (Second blind runs)
When the Cl2 reaches to the predetermined 3 volt, the current to the
TR7 circuit is cut off by operation of the ICS comparator.
By the TR7 turns off, the magnet which has held the second shutter blind
is now turned off to release the second shutter blind.
Thus the proper exposure time is obtained. As soon as the mirror
returns and the memory switch turns on and the LEO lights up again.
With the finger detached from the shutter button, the main switch turns
off and the LEO puts out ..
The trigger switch turns on with the film advance lever wound for next
exposure.
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