Brother KE-430HX Service Manual page 220

14. ELECTRIC MECHANISM
Error status #19 The machine cannot produce correct stitches.
Probable causes
1. Malfunction of machine
encoder
2. If uneven seams are being sewn,
there is a malfunction of the pulse
motor or the mechanism
incorrectly adjusted.
Error status #20 The thread trimmer does not operate.
Probable causes
1. Incorrect memory switch setting
2. Incorrect mechanism adjustment
3. Poor connector connection
4. Malfunction of thread trimmer pulse
motor
5. Malfunction of tension solenoid
209
Check/ repair/ adjust
motor Refer to step 1 in #18.
a. Refer to step 4 in #7 and step 4 in #8 and step
4 in #9.
is
b. If the uneven seams are due to insufficient
work clamp pressure, adjust while referring to
"9-9. Adjusting the work clamp lift amount
(KE-430HX/HS)" or "9-10. Adjusting the
button clamp lift amount (BE-438HX/HS)".
c. If there is play in the feed mechanism, adjust
the feed mechanism.
Check/ repair/ adjust
Set memory switch No. 164 to OFF.
* If it is set to ON, thread trimming will not be
carried out.
Adjust the thread trimmer mechanism while
referring to "9-21. Adjusting the thread nipper
motor position".
* If it seems that the thread trimming mechanism
is not operating properly, carry out steps 3 to 6
below.
Check that main PCB connector P24 (TPM) and
P7 (T-ENC) are inserted.
Disconnect main PCB connector P24 (TPM) and
measure the resistance between terminals 1-2
and 3-4 of the cord connector.
OK if 2-3 ohms.
4185B
Disconnect main PCB connector P19 (SOL2) and
measure the resistance between terminals 1-2 of
the cord connector.
OK if 4.99-5.51 ohms (5.25 ohms +/- 10%).
4188B
KE-430HX/KE-430HS, BE-438HX/BE-438HS
Parts to be replaced
Parts to be replaced
Thread trimmer pulse
motor assembly
Tension solenoid
(Continued on next page.)