Tweco 400 MST Arc Master - Manual (Page 43)

400MST
9
ADVANCED TROUBLESHOOTING
9 – 6
1.2.5 E12 "Low Input Voltage Failure"
Cause
Occurs when the input voltage is less than
approximately 150VAC (=1/1.41 of the maximum
value of the sinusoidal wave).
Verification/Remedy
a) Verify input voltage.
 Follow the instruction in section 9.1.4.2.
b) Replace PCB4 (WK-4819).
 If the voltage and current available is deter-
mined to be sufficient, replace PCB4.
 Refer to section 9.2.4.4 for the replacement
of PCB4.
1.2.6 E14 "Low Input Voltage Warning"
Cause
Occurs when the input voltage is less than
approximately 173VAC (=1/1.41 of the maximum
value of the sinusoidal wave).
Verification/Remedy
a) Verify input voltage.
 Follow the instruction in section 9.1.4.2.
b) Replace PCB4 (WK-4819).
 If the voltage and current available is deter-
mined to be sufficient, replace PCB4.
 Refer to section 9.2.4.4 for the replacement
of PCB4.
1.2.7 E81 "Abnormal Input Voltage"
Cause
Failure detected by the input voltage detection cir-
cuit, etc.
Verification/Remedy
a) Verify the AC input voltage using a voltmeter.
 Follow the instruction in section 9.1.4.2.
b) Verify the wiring harness and connection of
CN1 on PCB16 (WK-4917) and CN2 on PCB3
(WK-5548).
 Confirm a secure connection of the harness
between CN1 on PCB16 and CN2 on PCB3.
 Contact the manufacturer if you find any bro-
ken connectors or damaged wiring har-
nesses.
c) Verify PCB4 (WK-4819) for burned or discol-
ored components or printed circuit board.
 Confirm that the PCB is securely fastened in
place. (No loose screws).
 Refer to section 9.2.4.4 for the replacement
of PCB4.
1.2.8 E82 "Rated voltage selection cir-
cuit abnormality"
Cause
Failure detected by the input voltage detection cir-
cuit, etc.
Verification/Remedy
a) Verify the wiring harness and connection of
CN4 on PCB4 (WK-4819).
 Confirm a secure connection of CN4 on
PCB4.
 Contact the manufacturer if you find any bro-
ken connectors or damaged wiring har-
nesses.
b) Verify PCB4 (WK-4819) for burned or discol-
ored components or printed circuit board.
 Confirm that the PCB is securely fastened in
place. (No loose screws).
 Refer to section 9.2.4.4 for the replacement
of PCB4.
1.2.9 E83 "Abnormal mains supply
voltage"
Cause
Failure detected by the input voltage detection cir-
cuit, etc.
Verification/Remedy
a) Verify the AC input voltage using a voltmeter.
 Follow the instruction in section 9.1.4.2.
b) Verify the wiring harness and connection of
CN1 on PCB16 (WK-4917) and CN2 on PCB3
(WK-5548).
 Confirm a secure connection of the harness