Brother 1660E Service Manual page 92

M-13 "55 HIGH VOL MALF" is displayed (Faulty output from the H.V.P.S. ASSY)
Possible cause Step
Main PCB 1
HV harness 2
High-voltage
power supply PCB
Check
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?
Pin No. Signal name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Is the voltage of the each pin of the high-voltage
power supply PCB connector P4 turned on and
off?
Result
No
Voltage
(reference
value)
/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
No
Yes
VI - 16
Remedy
Replace the main PCB assy.
Remarks
Default: 2.5V
Replace the HV harness.
Replace the high-voltage
power supply PCB assy.