Brother KE-430F Service Manual page 162

15. ELECTRIC MECHANISM
Error status #3 No keys on the operation panel are not activated.
Probable causes
1. Malfunction of panel PCB
2. Main software not
correctly
Error status #4 Work clamp does not return to the home position even after the foot switch is depressed.
Probable causes
1. Incorrect depression
adjustment
2. Malfunction of treadle unit
3. Malfunction of foot switch and cord
(option)
4. Malfunction of foot switch adapter
harness (option)
152
Check that connector P3 (PANEL) is connected to
the motor PCB, and that connector P1 (MAIN) is
connected to the panel PCB.
installed Carry out the restore operation by referring to
"7-13. Updating the control program version ".
position Adjust the position while referring to "11-22.
Setting method for standard depression strokes
(Foot switch)".
With the motor PCB connector P12 (PEDAL)
connected, turn on the power and measure the
voltage between pins 3-4 of the cord connector
(No. 3 +, No. 4 -).
OK if the voltage is approximately 2 V at neutral,
approximately 4 V when the foot switch is
depressed as far as it will go, and approximately
0.5 V when it is depressed backward.
2714B
(Check that the power is turned off.)
Disconnect the foot switch from the foot switch
adapter harness, and measure the voltage
between pins 5-6 and 7-8 of the foot switch
connector. (Check between pins 9-10 if using a
2-pedal foot switch.)
OK if the resistance is normally ∞ ohms but 0
ohms when depressed.
2956B
After checking the foot switch in step 3, connect
the foot switch adapter harness to the foot switch
and measure the voltage between pins 1-2 and
3-4 of connector P15 (PEDAL) of the main PCB.
(Check between pins 5-6 if using a 2-pedal foot
switch.)
(Touch the ohmmeter against the lead wires
without disconnecting the connector.)
OK if the resistance is normally ∞ ohms but 0
ohms when depressed.
2716B
KE-430F, BE-438F
Check/ repair/ adjust
Check/ repair/ adjust
Parts to be replaced
Operation panel assembly
Panel PCB assembly
Panel harness
Parts to be replaced
Foot switch
Foot switch
Foot switch
Foot switch cord