Brother KE-430F Service Manual page 171

Error status #19 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
solenoid
5. Malfunction of tension solenoid
6. Malfunction of main PCB.
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 "11-14. Adjusting the thread trimmer
cam 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 P2 (SOL1) and
P3 (SOL2) is connected.
trimmer Disconnect main PCB connector P2 (SOL1) and
measure the resistance between pins 3-6 of the
cord connector.
OK if 6-8 ohms.
2726B
Disconnect main PCB connector P3 (SOL2) and
measure the resistance between pins 1-2 of the
cord connector.
OK if 6-8 ohms.
2727B
a. Turn on the power switch and check LD2
(green) on the main PCB.
OK if illuminated.
b. Turn off the power switch, and with connector
P2 (SOL1) disconnected from the main PCB,
check the continuity between terminals 3 and
6 of connector P2 on the main PCB.
OK if ∞ ohms.
c. With connector P3 (SOL2) disconnected from
the main PCB, check the continuity between
terminals 1 and 2 of connector P3 on the main
PCB.
OK if ∞ ohms.
d. With connector P2 (SOL1) inserted into the
main PCB, turn on the power switch, carry out
sewing and measure the voltage between
terminals 3 and 6 of connector P2.
OK if voltage is output momentarily at the
sewing end.
e. With main
connected, turn on the power and carry out
sewing, and measure the voltage between
pins 1-2 of connector P3 (SOL2).
OK if there is voltage output momentarily after
sewing stops.
2728B
KE-430F, BE-438F
Check/ repair/ adjust
PCB connector P3
15. ELECTRIC MECHANISM
Parts to be replaced
Thread trimmer solenoid
assembly
Tension solenoid
Main PCB assembly
(SOL2)
161