Brother KE-430B Service Manual page 195

Error status #18 The thread trimmer does not operate.
Probable causes
3. Main circuit board defective
Thread trimmer
Error status #19 Thread take-up lever does not operate.
Probable causes
1. Home position sensor not
adjusted properly
2. Thread take-up
defective
3. Main circuit board defective
Thread take-up lever
3650Q
4. Incorrect memory
setting
Error status #20 The machine does not stop with the needle at the upper position.
("E-50" appears <"E.22" for the KE-436B and 436C>.)
Probable causes
1. Poor adjustment
2. Synchronizer defective
• With P5 (SOL) connectors plugged in on
the main circuit board, turn on the power,
perform sewing, and measure the voltage
across pins 1 and 2 in the connector on
the cable.
If there is a sudden voltage output at the
end of sewing, it is OK.
3648Q
• Adjust the thread take-up mechanism
(page 62–64).
(If the solenoid does not work even after it
is separated from the mechanical parts,
perform the following items #19-2 and
#19-3.)
solenoid • Separate P4 (SOL2) 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 12–14 , the solenoid
is not defective.
3649Q
• With connector P4 (SOL2) on the main
circuit board removed, turn on the power,
perform sewing, and measure the voltage
across pins 1 and 2 of connector P4.
If there is a sudden voltage output at the
end of sewing, it is OK.
switch • Set memo-17 to OFF.
<KE-436B, 436C>
• Set memo-28 to ON.
• See "5-25. Adjusting the needle up stop
position," for adjustment.
• See #16-1.
KE-430B, 430C series
Check/ repair/ adjust
Check/ repair/ adjust
Check/ repair/ adjust
8. ELECTRIC MECHANISM
Parts to be replaced
Main circuit board
Parts to be replaced
Parts to be replaced
188