Brother KE-430F Service Manual page 159

Error status #1 The power indicator does not light when the power is turned on.
Probable causes
1. (Check the LEDs)
2. Malfunction of power cord
3. Blown fuse
4. Malfunction of motor PCB 1
5. Malfunction of power PCB
Check/ repair/ adjust
Turn on the power switch and check that the
various LEDs illuminate in the following order.
a. LD2 (red) on motor PCB does not illuminate.
→＃1－2、＃1－3、＃1－4
b. LD2 (red) on power PCB does not illuminate.
→＃1－5、＃1－6、＃1－7、＃1－8
c. LD3 (green) on motor PCB does not
illuminate.
→＃1－9
d. Power indicator on panel does not illuminate.
→＃1－10
Disconnect the power supply connector which
links the power cord for the power switch and the
motor PCB, turn on the power switch, and then
measure the voltage between terminals 1 and 3 of
the cord-side connector.
OK if the voltage is the same as mains voltage.
In addition, check that the power supply voltage at
the wall outlet is within the range of the
specification voltage +/- 10%.
After inspecting, turn off the power switch and
connect the power supply connector.
2712B
Remove fuses F1 and F2 from the motor PCB
and check the continuity.
OK if there is continuity.
Remove P2 (DCIN) from the power PCB, turn the
power back on, and then check LD2 (red) on the
motor PCB.
OK if illuminated.
After checking, turn off the power switch, wait for
five minutes or more, and then insert P2 into the
power PCB.
Turn the power back on, and then with P2
inserted into the power PCB, check the voltage
between terminals 1 and 3 of P2.
OK if 170 to 270 V DC.
Disconnect connector P1 (POWER2) from the
main PCB and 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.
After checking, turn off the power switch, wait for
one minute or more, and then insert P1 into the
main PCB and P4 and P6 into the motor PCB.
KE-430F, BE-438F
15. ELECTRIC MECHANISM
Parts to be replaced
GFUSE15A
(15A-250V)
Motor PCB assembly
Power PCB assembly
(Continued on next page.)
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