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VI - 6
Possible cause Step Check Result Remedy
Main PCB 1 When a test print is carried out, is the voltage
of the each pin in the main PCB connector
P6 turned on and off as the below list?
No
Replace the main PCB assy.
HV harness 2
Is the voltage of the each pin of the high-voltage
power supply PCB connector P4 turned on and
off?
No Replace the HV harness.
M-13
Yes Replace the high-voltage
power supply PCB assy.
"55 HIGH VOL MALF" is displayed (Faulty output from the H.V.P.S. ASSY)
High-voltage
power supply PCB
Pin No. Signal name Voltage
(reference
value)
Remarks
/HV1AC 0V
5.8V
/HV1DC 0V
8.6V
/DBAC 0V
6.3V
/DBDC 0V
8.6V
DNSTY 1.0 ~ 4.0V
/HVT1 0V
8.7V
/HVT2 0V
15.1V
/HVT3 0V
9.0V
HVT4 0.4 ~ 5.0V
HVTFB 0.4 ~ 4.0V
TONER1 0.0 ~ 3.5V
0V 0V
TONER2 2.0 ~ 4.5V
24VRET 0V
5V 5V
24V 24V
1
2
3
4
5
6
7
8
9
10
11
13
12
14
15
16
Default: 2.5V