Brother KE-430F Service Manual page 160

15. ELECTRIC MECHANISM
Error status #1 The power indicator does not light when the power is turned on.
Probable causes
6. Malfunction of main PCB
7. Malfunction of main PCB 2
8. Malfunction of panel PCB
9. Poor harness connection
10. Malfunction of operation panel
150
Check/ repair/ adjust
Disconnect connectors P4 (POWER3) and P6
(POWER2) from the motor PCB, and then turn on
the power switch and check LD2 (red) on the
power PCB.
OK if illuminated.
(LD1 (red) on power PCB does not illuminate)
After checking, turn off the power switch, wait for
one minute or more, and then insert P4 and P6
into the motor PCB.
Disconnect connector P1 (POWER2) from the
main PCB and connectors P1 (MT-ENC), P2
(MAIN) and P3 (PANEL) from the motor PCB, and
then turn on the power switch and check LD2
(red) on the power PCB.
OK if illuminated.
After checking, turn off the power switch, wait for
one minute or more, and then insert P1 into the
main PCB and P1, P2 and P3 into the motor PCB.
Disconnect connector P1 (POWER2) from the
main PCB and connectors P1 (MT-ENC) and P2
(MAIN) from the motor PCB, and then turn on the
power switch and check LD2 (red) on the power
PCB.
OK if illuminated.
After checking, turn off the power switch, wait for
one minute or more, and then insert P1 into the
main PCB and P1 and P2 into the motor PCB.
Check that connector P4 (POWER3) of the motor
PCB is inserted, and then turn on the power
switch and check the voltage between terminals 1
and 4 of P4.
OK if approximately 24 V DC.
2713B
Check that connector P3 (PANEL) of the motor
PCB is inserted.
KE-430F, BE-438F
Parts to be replaced
Main PCB assembly
Motor PCB assembly
Panel PCB assembly
Panel harness
Power PCB assembly
Operation panel assembly
Panel PCB assembly
Panel harness