Canon CLC5000 - DC Power Is Absent

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON CLC5000 REV.0 JAN. 2001
CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS
5-151
Power switch (SW2) faulty
Wiring
5) Connect the probes of the meter to both terminals of the power
switch (SW2). Is it 0
ΩΩ
ΩΩ
Ω when the switch is turned ON, and
∞Ω∞Ω
∞Ω∞Ω
∞Ω when
the switch is turned OFF?
NO: Replace SW2.
YES: Check the wiring of the AC power line and connector for poor con-
tact.
4.1.46 DC power is absent.
AC power supply
1) Is AC power present between the following terminals?
J5327M-1 and J5327M-4 on the DC power supply PCB 1 (upper)
J5301M-1 and J5301M-3 on the DC power supply PCB 1 (lower)
J5337-1 and J5337-3 on the DC power supply PCB
NO: See “AC power is absent.”
Right cover switch (SW1)
2) Disconnect the power plug, and check the front cover (right) switch
for electrical continuity. Is it normal?
NO: Replace the front cover (right) switch.
Wiring
DC power supply
DC load
3) Disconnect all connectors except for the following:
J5327M on the DC power supply PCB 1 (upper)
J5301M on the DC power supply PCB 1 (lower)
J5337 on the DC power supply PCB 2
Connect the power plug, and turn ON the power switch. Is the DC
power supply output of the above connectors on the DC power sup-
ply normal?
Caution 1: Be careful to avoid shorting the connectors.
Keep in mind that +24VU and +214VR are not generated.
YES: Turn OFF the power switch, and connect one of the disconnected
connectors; then, turn ON the power. Repeat this for all connectors
to find out which connector activates the protection circuit. Check
the wiring from that connector to the DC load.
NO: Replace the faulty DC power supply PCB.