L. Error Detection Circuit
1. Outline
Figure 3-442 is a block diagram of the error
detection control circuit, and the circuit has the fol-
lowing functions:
a. Monitors the operation of the scanning lamp
(LA1) and the C.F.F. lamp.
b. Monitors the operation of the fixing heater
(main, H1; sub, H2).
c. Monitors the rotation of each motor in normal
mode and stream reading mode.
Each of these monitoring functions are con-
trolled by programs stored in the gate arrays on
the DC controller PCB.
2. Scanning Lamp Error Activation Detection
Circuit
The gate array receives the scanning lamp ON
signal (LRD) and the scanning lamp ON detection
signal (LAA). If the scanning lamp is ON in the
absence of the scanning lamp ON signal, an error
will be identified.
If such happens, the gate array informs the
master CPU on the DC controller of a scanning
lamp error activation and send the power switch
OFF signal (
) to the power supply unit.
This condition powers the relay in the relay unit
to turn OFF the main relay (RL3), thereby stop-
ping AC power supply (called error auto power-
off).
PWOFF
3. OPERATIONS AND TIMING
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-129
Lamp
regulator
Micro-
processor
DC controller PCB
Gate
array
LAA
LA1
Error
LRD
DC power
supply PCB
Power
supply
PCB
(122VU
for relay)
PWOFF
RL3
Figure 3-442
Содержание NP6085
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Страница 498: ...COPYRIGHT 1996 CANON INC CANON NP6085 REV 0 JULY 1996 PRINTED IN JAPAN IMPRIME AU JAPON A 5 ...
Страница 502: ...PRINTED IN JAPAN IMPRIME AU JAPON 0697AB0 6 3 This publication is printed on 70 reprocessed paper ...