Minolta XG7 - Page 30

16,
Winder control function
Unlike XD, XG is not furnished with a winder switch but provided with the signal from
the reset switch (S,) for the purpose of winder control. The winder operates when
the winder terminal voltage is zero, and it stops when voltage exists.
The winder terminal voltage is 2V with S, ON, and OV with the switch OFF. Also,
S, is ON with winding completed, and OFF with shutter release completed.
j
S,
Winder terminal
Strobo Auto
The circuit receives the signal of stobo (8668) and indicates for strobo charge com-
pletion in the finder and changes the shutter speed to the strobo-tuned speed.
When the charge of strobo has been completed, pulse signal enters the signal contact
on the camera side from the signal contact on the strobo side. The pulse operates Q,
~Q;. Q, turns off the indication circuit, Q; holds the magnet, and Q; charge the
condenser (C;) for time constant in the control circuit at a high speed (approx. 1/
1000 sec.). Also, Q, operates at 2V and doesn't at 1.6V. Therefore, indication LED
("60") turns on and off.
When the shutter is operated and X contact is closed, the strobo flashes and the
strobo signal goes out. Then Q, which held the magnet is turned off and the second
curtain starts running, thus completing the exposure.
——==—- Strobo signal
Strobo (8668) ae
—— |
To
indication
circuit
To
magnet
holder
To
control
circuit
To
indication
"60"
X
contact
Wh
¥
sense same: | I) _ ait
Metering SW. S, Lil
Auto speed indication pf ineccinall
“60" blinking LL, ir
w=
tJ
ge
ae es
Release SW. S, es) ees | (nae
Shutter / f
X contact i |e