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15. ELECTRIC MECHANISM
157
KE-430F, BE-438F
Error status #9 Error code appears on the display when the foot switch is depressed.
Probable causes Check/ repair/ adjust Parts to be replaced
1. If "E690" is displayed during home
position detection, there is a
malfunction of the thread nipper.
a. Check the position of the thread nipper driving
lever.
b. Remove any thread scraps from behind the
needle plate.
2. If "E960" is displayed during home
position detection, the thread
nipper home position adjustment is
incorrect.
Adjust the home position while referring to
"11-18-3. Thread nipper motor home position".
3. If the thread nipper pulse motor
does not operate and “E690” is
displayed, there is a malfunction of
the power PCB.
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.
Power PCB assembly
4. If the thread nipper pulse motor
does not move and "E690" is
displayed, there is a malfunction of
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.
Main PCB assembly
5. If the thread nipper pulse motor
moves slightly and "E690" is
displayed, there is a malfunction of
the encoder.
a. Check that connector P20 (T-ENC) is inserted
into the main PCB and that the color matches.
b. Check the encoder input while referring to
"4-7. Input checking method".
Pulse motor T assembly
Main PCB assembly
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. 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.
Pulse motor T assembly
Main PCB assembly
2717B
2724B
2725B