CIGWELD TRANSTIG 300 AC/DC, Service Manual, Page: 66 / 134

1
3
ADVANCED TROUBLESHOOTING
13.
2.8 E82 "Rated Voltage Selection
Circuit abnormality"
Cause
Rated voltage selection circuit inside the Welding
Power Source is not functioning properly.
Verification/Remedy
a) Verify the wiring harness and connection of
CN4 on PCB4 (WK-4819).
Re-install the harness with a secure connec-
tion.
Contact the manufacturer if you find any bro-
ken connectors or a damaged wiring harness.
b) Verify PCB4 (WK-4819) and replace it if neces-
sary.
Check whether there are any abnormalities
on the appearance of PCB4.
Replace PCB4. Refer to section 1
4
.3.4.
13.
2.9 E83 "Abnormalities in Mains
Supply Voltage Detection"
Cause
Abnormalities, such as an input voltage detection
circuit
Verification/Remedy
a) Verify main supply voltage.
Perform what is described in a section of
"Verification of the Power Supply Voltage".
Refer to section 1
3
.5.2.
b) Confirm a secure connection of the harness
wired between CN2 on PCB3 (WK-5548) and
CN1 on PCB21 (WK-4917).
Re-install the harness with a secure connec-
tion.
Contact the manufacturer if you find any bro-
ken connectors or damaged wiring harness.
c) Verify PCB4 (WK-4819) and replace it if neces-
sary.
Check whether there are any abnormalities
on the appearance of PCB4.
Replace PCB4. Refer to section 1
4
.3.4.
13.
2. 10 E85 "Pre-charge abnormality"
Cause
Due to malfunction inside the Welding Power
Source, primary capacitors are not charging cor-
rectly.
Verification/Remedy
a) Verify the connection of PCB2 (WK-5597) and
the rectified output voltage of the rectifier.
Verify the connection between CN2 on PCB2
and CN3 on PCB3.
Confirm whether there is any breakage
(blown, burnt, cracked, etc.) of R18 on PCB2.
Perform what is described in a section of
"Verification of the Power Supply Voltage".
Refer to section 1
3
.5.2.
b) Verify the primary diode (D1).
Verify D1. Refer to section 1
3
.5.5.
Replace D1. Refer to section 1
4
.3.31.
c) Verify the primary IGBT (Q1-Q24).
Verify IGBT. Refer to section 1
3
.5.7.
Replace IGBT. Refer to section 1
4
.3.7,
1
4
.3.8.
d) Replace PCB2 (WK-5597) and PCB4
(WK-4819).
Replace PCB2 and PCB4, when abnormali-
ties occur, even if carries out the above-men-
tioned verifications. Refer to section 1
4
.3.2,
1
4
.3.4.
13-6 June 30, 2008
TRANSTIG 300 AC/DC SERVICE MANUAL