Brother HE-800B Service Manual page 138

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
129
Check/ repair/ adjust
Turn off the power switch, disconnect connector
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.
Turn off the power switch, disconnect connector
P1 (POWER2)
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.
Turn off the power switch, disconnect connector
P1 (POWER2)
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.
Turn off the power switch, check that connector
P4 (POWER3) is inserted into the motor PCB,
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.
HE-800B
from the main PCB
from the main PCB
9. ELECTRIC MECHANISM
Parts to be replaced
Main PCB assembly 800B
Main PCB assembly 800B
and
LCD panel PCB assembly
and Panel harness
Power PCB assembly
Operation panel assembly
LCD panel PCB assembly
Panel harness