Chapter V Troubleshooting - Brother DX-2000 Service Manual

Problem Cause
The Duplex mode cannot Misoperation
be set on the panel.
Modular cable
Main PCB
"NO DX TRAY" error Misoperation
message appears.
Main PCB
Paper pressure
motor
"DX OPEN" error message Misoperation
appears.
Open cover sensor
Main PCB
"DX FAN MALF" error Main PCB
message apprears.
Fan
Main PCB
Troubleshooting (1)
Check
Is the modular cable connected properly?
Does a voltage of 24V appear at pin 14 or
15 of I/F PCB's connector P4?
Is the Duplex tray loaded properly into the
cassette according to the manual?
Does a voltage of 24V appear at pins 3
and 4 of I/F PCB's connector P3, and does
the voltage vary from 0V to 24V at pins 1,
2, 5 and 6 when the paper cassette is set?
Does the paper pressure motor run when
the paper cassette is set?
Is the hook of the Duplex unit's reversing
mechanism engaged completely with the
outside frame?
Does a voltage of 5V appear at pin 3 of I/F
PCB's connector P1 when the cover is
closed?
Does a voltage of more than15V appear
at pin 1 of main PCB's connector P1?
Is the voltage 0V at pin 2 of main PCB's
connector P1?
Result Remedy
No Turn off the power to the printer, and connect
the modular cable properly. Then, turn on the
power again.
Yes Replace the main PCB.
Replace the modular cable.
No
No Load the Duplex tray into the cassette according
to the manual.
No Replace the main PCB.
No Replace the paper pressure motor.
Yes Replace the cassette sensor lever and
leaf switch. Refer to Figure 4.26 (IV-9).
No Close the reversing mechanism so as to engage
the hook securely with the outside frame.
No Replace the open cover sensor or cover sensor
harness.
Yes Replace the main PCB.
No Replace the main PCB.
No Replace the fan.
Yes Replace the main PCB.