Brother HL-2060 - Troubleshooting of Malfunctions

VI-11
4. TROUBLESHOOTING OF MALFUNCTIONS
M-1 No DC power supplied
Possible cause Step Check Result Remedy
PCBs 1 Does any PCB have the short circuit between
+24V and 0V, +5V and 0V or +24V and +5V?
Yes Replace the PCB having
the short circuit.
Low-voltage
power supply
PCB
2 Is the voltage of P101-8 in the low-voltage
power supply PCB connector 0V?
Yes Replace the low-voltage
power supply PCB assy.
Main PCB
LV harness
DC fan motor
No Replace the main PCB
assy, the LV harness or
the DC fan motor.
M-2 Malfunction of LCD display on the control panel.
Possible cause Step Check Result Remedy
LCD module 1 Dose the voltage of the following signals vary
to 5V or 0V when the LCD displays are
Yes Replace the control panel
unit.
Control panel
PCB
Switch flat cable
Main PCB
changed through switch operations?
(Check following signals using the digital
memory scope with the trigger function for
this check)
No Replace the main PCB
assy, the switch flat cable
or the control panel unit.
M-3 Malfunction of control panel LED lamps.
Possible cause Step Check Result Remedy
LED lamps 1 Dose the voltage of the following signals stay
0V while the "04 SELF TEST" is displayed
Yes Replace the control panel
unit.
Control panel
PCB
Switch flat cable
Main PCB
after switching the power on and stay 5V for
about 0.5 seconds after the message goes
off?
(Do the LED lamps turn on and off in response
to the signal levels of 0V and 5V?)
No Replace the main PCB
assy or the switch flat
cable.
Panel PCB
−
P1-14
−
P1-10
−
P1-16
−
P1-12
−
P1-6
−
P1-8
−
P2-4
−
P2-3
−
P2-2
−
P2-1
−
P2-11
−
P2-9
Main PCB
P1-14
P1-10
P1-16
P1-12
P1-6
P1-8
LCD
−
7
−
8
−
9
−
10
−
4
−
6
Signal
PAD4
PAD5
PAD6
PAD7
LCDRS
LCDE
Panel PCB
−
P1-1
−
P1-4
−
P1-3
−
P1-2
Main PCB
P1-1
P1-4
P1-3
P1-2
Signal
LED1(ON LINE)
LED2(READY)
LED3(DATA)
LED4(ALARM)