Brother KE-430F Service Manual page 167

Error status #9 Error code appears on the display when the foot switch is depressed.
Probable causes
1. If "E690" is displayed during home
position detection, there
malfunction of the thread nipper.
2. If "E960" is displayed during home
position detection,
nipper home position adjustment is
incorrect.
3. If the thread nipper pulse motor
does not operate and "E690" is
displayed, there is a malfunction of
the power PCB.
4. If the thread nipper pulse motor
does not move and "E690" is
displayed, there is a malfunction of
the main PCB.
5. If the thread nipper pulse motor
moves slightly and
displayed, there is a malfunction of
the encoder.
6. If the thread nipper pulse motor
does not move and "E690" is
displayed, there is a malfunction of
the pulse motor and cord.
a. Check the position of the thread nipper driving
is a lever.
b. Remove any thread scraps from behind the
needle plate.
Adjust the home position while referring to
the thread "11-18-3. Thread nipper motor home position".
Disconnect connectors P1 (POWER2) and P24
(POWER1) from the main PCB, and then turn on
the power switch and check LD1 (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 and P24
into the main PCB.
a. Disconnect connector P1 (POWER2) from the
main PCB, and check the continuity between
terminals 1 and 2 of P1.
OK if ∞ ohms.
b. Disconnect connector P4 (TPM) from the main
PCB, and check the continuity between
terminals 1 and 2, 3 and 4 of P4.
OK if ∞ ohms.
c. Insert P1 and P4 into the main PCB, turn on
the power switch and then check LD1 (red) on
the power PCB.
OK if illuminated.
If LD1 is illuminated during the check in step 1
but it does not illuminate when P1 and P24
are connected, there is a malfunction of the
main PCB.
d. Check LD2 (green) on the main PCB.
OK if illuminated.
2717B
2724B
a. Check that connector P20 (T-ENC) is inserted
"E690" is into the main PCB and that the color matches.
b. Check the encoder input while referring to
"4-7. Input checking method".
a. Disconnect the main PCB connector P4 (TPM)
and measure the resistance between pins 1-2
and 3-4 of the cord connector.
OK if 2-3 ohms.
b. If step a. (above) is OK, there is a malfunction
of the main PCB.
2725B
Check/ repair/ adjust
KE-430F, BE-438F
15. ELECTRIC MECHANISM
Parts to be replaced
Power PCB assembly
Main PCB assembly
Pulse motor T assembly
Main PCB assembly
Pulse motor T assembly
Main PCB assembly
157