Brother HL-1260 service manual Reference Value

M-13

"55 HIGH VOL MALF" is displayed (Faulty output from the H.V.P.S. ASSY)

Possible cause	Step	Check	Result	Remedy
Main PCB	1	When a test print is carried out, is the voltage	No	Replace the main PCB assy.
		of the each pin in the main PCB connector
		P6 turned on and off as the below list?

Pin No.	Signal name	Voltage	Remarks
		(reference
		value)
1	/HV1AC	0V
		5.8V
2	/HV1DC	0V
		8.6V
3	/DBAC	0V
		6.3V
4	/DBDC	0V
		8.6V
5	DNSTY	1.0 ~ 4.0V	Default: 2.5V
6	/HVT1	0V
		8.7V
7	/HVT2	0V
		15.1V
8	/HVT3	0V
		9.0V
9	HVT4	0.4 ~ 5.0V
10	HVTFB	0.4 ~ 4.0V
11	TONER1	0.0 ~ 3.5V
12	0V	0V
13	TONER2	2.0 ~ 4.5V
14	24VRET	0V
15	5V	5V
16	24V	24V

HV harness	2	Is the voltage of the each pin of the high-voltage	No	Replace the HV harness.
		power supply PCB connector P4 turned on and
High-voltage			Yes	Replace the high-voltage
		off?
power supply PCB				power supply PCB assy.

VI - 6