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e. Overvoltage protection circuit
When an overvoltage is generated in the copy lamp section, it is
detected by the overvoltage detection circuit to turn off the power
relay (S701) to stop the operation of the copy lamp.
The operation is of the latch system. After removing the overvoltage,
supply the AC power to reset.
T704
N-T01-014
Fig. 37 Overvoltage protection circuit
f. CLCON signal
The CL voltage is varied by the CLCON signal (PWM). The relation-
ship between the CLCON signal and the CL voltage is as shown in
the figure below.
CL(V)
51V
100
50
Fig. 38 CL voltage ∼ CLCON duty
T1
T2
T2 = 819.9µs (1.22KHz)
duty = T1/T2 x 100 (%)
Fig. 39 CLCON signal
D766
R7049
1K(1/2W)
RD30ED3
D767
R7050
RD30ED3
1K(1/2W)
R7051
470
D765
RD16ESAB2
R7052
10K
PC708
PC707
Primary side
Secondary side
29.5V
20
0
duty(%)
T1 = Lighting time
0V
T2 = OFF time
R7087
2.7K
C7012
D774
0.1/50V
RD5.6ESAB2
(RPE)
24VDC
Q718
2SA1020
R7086
4.7K
D777
1SS178
9 – 30
R7106
407K
R7090
R7100
5.6K(E)
2.2K
D702
1SS178
PC707
R7092
R7101
4.7K
2.2K
PS2561
VR705
10KB
R7094
1.5K(E)
L732
PJDT101K
Fig.44
Fig.43
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