Yashica Electro 35 AF-mini, Руководство по ремонту

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HEAVY LINES INDICATE CURRENT PATH
FOR EXPOSURE CYCLE
When the shutter-release switch reaches the bottom of its stroke, it connects the timing
capacitor C1 to the circuit. Also, the shutter releases and the blades move to the open
p o s i t i o n .
Transistor TR1 remains turned off while the timing capacitor charges to the required
voltage. Consequently, transistor TR4 conducts current through the electromagnet.
The electromagnet holds its armature to keep the blades in the open position.
The time it taıies for the timing capacitor to charge depends on the resistance of the CdS
cell. When the timing capacitor reaches a sufficient charge, the voltage on its positive
plate turns on transistor TR1 -- this trigger voltage depends on the diaphragm setting
Which determines the resistance in the emitter circuit of TR1. TR1 turns on TR2, and
TR2 turns on TR3. Now, TR3 robs transístor TR4 of the base current it needs to con-
duct. TR4 shuts off, deprivíng the electromagnet of current.
As the blades close, the blade-operating ring closes the capacitor-shorting switch S3.
S3 opens as the blades open and closes as the blades close. So the time that S3 opens
determmes when the timing capacitor can start accepting a charge. The eccentric
adjustment on S3 is your high-speed adjustment point.
kn.