Brother BE-438B, Service Manual

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8. ELECTRIC MECHANISM
Error status #16 Error code appears on the display window after the machine operates.
Probable causes Check/ repair/ adjust Parts to be replaced
2. A malfunction occurs due to
noise or main PROM is
defective when error code
E-21 appears after the
machine is started.
a. Make sure that the ground wire is surely
grounded and there is no equipment that
generates strong electrical noise in the
vicinity.
b. If the machine has been remodeled,
return the machine to its original condition
before checking.
c. If the error still occurs after replacement
of PROM, put the original PROM back
before checking.
([E.21]: KE-436B, 436C).
PROM
3. Power supply voltage ab-
normally lowers when error
code E-90 appears after the
machine is started.
([E.90]: KE-436B, 436C).
a. Make sure that the power supply voltage
of the wall socket is within ±10% of the
voltage specification.
b. See #1-2 and #1-3.
If 550VA/machine is not allocated at the
power source, the voltage will drop as soon
as the machine is started, resulting in this
error.
Error status #17 The machine cannot produce correct stitches.
Probable causes Check/ repair/ adjust Parts to be replaced
1. Synchronizer defective • See #16-1.
2. Pulse motor is defective or
mechanical adjustment is not
appropriate when stitching
deviates from what it should
be.
a. See #8-4.
b.
If stitching deviates because of
insufficient pressure of the work clamp,
see “Adjusting the work clamp lift
amount” for adjustment.
c. Make adjustments if the feed mechanism
has any unnecessary looseness.
Error status #18 The thread trimmer does not operate.
Probable causes Check/ repair/ adjust Parts to be replaced
1. Home position sensor not
adjusted properly
• Adjust the thread trimmer mechanism
(page 54, 55 and 86).
(When it is obvious that the thread trimmer
does not operate, perform the check/
repair/adjust items of #18-2 and #18-3.)
2. Thread trimmer solenoid
defective
• Separate P5 (SOL) connectors on the
main circuit board, and then measure the
resistance between pins 1 and 2 in the
connector on the cable.
If the resistance is 7–8

, the solenoid is
not defective.
Thread trimmer sole-
noid
3647Q
KE-430B, 430C series
187