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(10) Copy lamp control section
The output of transformer T301 in the AC PWB described later is
monitored by the CPU to detect the variation in the AC power voltage,
controlling the phase of copy lamp applying voltage and maintaining
the voltage at a constant level.
The variation in the copy lamp exposure amount is adjusted by
changing the time from the zero-cross point ((a) in Fig. 2) to V4 rising
edge (b) to control the copy lamp voltage.
IC111
7805
VI
VO
GND
1
3
2
BD102
S1NB60
T301
BD101
S1NB60
FW
C111
2200µF
35V
C107
47µF
10V
C234
22000pF
50V
ZD105
TMPG06-7.5A
5V
PWB
4
5
2
+
-
IC202
NJM2901M
FW
R101
2.0KJ
R228
30KF
C115
0.01µF
R227
2.2KF
R226
10K
5V2
FWS
C218
22000pF
R106
15KF
(100V series)
2KF
(200V series)
10
9
8
+
-
IC202
NJM2901M
R117
18KF
(100V series)
30KF
(200V series)
1SS133
R105
R104
C102
0.47µF
50V
R103
R102
CLV
DTC114EK
Q204
CLPWM
R286
1KJ
CLPWM
5V
R285
4.7KJ
C248
0.047µF
D143
1SS133
R287
1KJ
R284
10KJ
Q216
2SC2411K
Q215
DTA143ZKA
R116
200J
1/2W
CL
V5
V4
V3
V1
V3'
R234
15KJ
V2
12 – 9
www.freeservicemanuals.info
1/11/16
Published in Heiloo, Holland.