Troubleshooting Flowcharts - Brother LX-300 Service Manual

7.5 Troubleshooting Flowcharts

AC adaptor plugged in, power ON
Is POWER LED indicator lit?
Yes
Error at power ON
(red indicator flashes)
No
Is manual feed normal?
Yes
No
ERROR LED (red) flashes
Yes
Before film feed?
No
No

Nothing happens when power switch is
pressed.
a. Abnormal input voltage.
b. Abnormal +5V DC supply.
c. Defective main CPU.

Nothing happens when switches are pressed
(LED indicators do not light).
a. Defective switch or push switch on the
Switch PCB.
b. Defective LED on the Switch PCB.

An error occurred during processing after power
Yes ON (before film feed).
a. Abnormal +24V DC supply
b. Abnormal DC input voltage.
c. Abnormal X-cutter power ON processing.
d. Abnormal Y-carriage power ON processing.
e. Abnormal Y-cutter power ON processing.

An error occurred during processing after
power ON (after film feed).
a. Defective film or cartridge.
b. Defective film feed detector (TPS) switch.
c. Defective film feed system.

Nothing happens when switches are pressed
(LED indicators do not light).
a. Defective switch or push switch on the
Switch PCB.
b. Defective LED on the Switch PCB.

Abnormal manual feed .
a. Defective film feed (LF) motor.
b. Defective film compression system.
c. Problem related to paper eject roller.
7-2
See page 7-5.
See page 7-6.
See page 7-8.
See page 7-10.
See page 7-6.
See page 7-11.