Canon A-1 Repair Manual page 143

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7
.
E1LK (7P)
El lock-in signal from CPU IC.
(See also 3.3.1)
S
.
SLED (SP)
LED operation signal input.
(See also 3.3.22)
9.
OSC (9P)
Clock pulse frequency adjustment resistor attaches
to this pin.
Frequency is adjusted by changing the
resistor.
10.
GND (10, 20P)
Commorily called ground or body earth, this is the
electrical "common" for the unit.
11.
I SET (llP)
This the tiepoint for the resistor which determines
the current flow through the magnet coils.
Coil current:
S
rnA
(With SWl on = approx. 0.3 V)
12.
vco
(12P)
Input to voltage controlled oscillator for the
battery checker.
Frequency is adjusted by changing
capacitor CVCO.
(With SWl on V
=
about 1 volt; when
the Battery Check is pushed the voltage is about
1.5 V) pulse height.
(With 6 V input, frequency
should be 6 ± 2 Hz.
At 3.5 V, frequency should be
2
:Ie
1 Hz)
13.
PNP (13P)
When E1Lk signal is applied to pin 7, this pin becomes
ground.
It provide a ground for the El transistor
TR even if SWl is not closed.
14.
KVC (14P)
Ie standard reference voltage input.
KVC = 1.625
±
5%
15.
CLK (l5P)
Output form clock pulse generator .(See also 3.3
.
15)
77

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