Section Ill. REPAIR PARTS, SPECIAL TOOLS, AND EQUIPMENT
parts are listed and illustrated in Appendix D of
this manual,
No special tools or equipment are required b y
direct and general support maintenance for the
maintenance of this welding machine.
No specially designed book and equipment are
required for direct and general support mainte-
nance of this welding machine.
tenance Repair Parts
Direct and General support maintenance repair
Section IV. TROUBLESHOOTING
its components. Each malfunction stated is fol-
58. General
lowed by a list of probable causes of trouble. The
This section provides information useful in
corrective action recommended is described oppo-
diagnosing and correcting unsatisfactory opera-
site the probable cause.
tion or failure of the welding machine or any of
Table 5-1.
Troubleshooting
Malfunction
Probable cause
Corrective action
a. Repair or replace transformer (para
1. Welding Machine Smokes
a. Main transformer defective -------- --
6-28).
Excessively.
b. Replace transformer (para 6-27).
b. Control transformer defective ------ ---
Polarity selector switch defective-
---
Replace switch (para 6-3).
2. Polarity Cannot be Selected . . . ..
Replace switch (para 6-3).
Range selector switch defective- ---------
3. Range Cannot be Selected . . . . . . .
a. Repair or replace transformer (para
a. Main transformer defective - -------
4. Welding Maching Fails to Start- -
6-28).
b. Repair or replace wiring (para 6-30).
b. Wiring defective ---------------------
a. Replace rectifier (para 69).
5. Welding Machine Operates
a. Power rectifier defective- ------------
b. Replace output control rheostat (para
Erratically.
b. Output control rheostat defective- ----
6-4).
c. Clean or straighten contacts, or replace
c. Range switch contacts dirty, greasy or
range switch (para 63).
bent.
a. Repair or replace wiring (para 630).
a. Wiring shorted -------------- --------
6. Contactor Breaks Circuit---- ----
b. Repair or replace transformer (para
b. Main transformer shorted----------
a. Replace output control rheostat (para
7. No Current Control -------------
a. Output control rheostat defective ----
6-4) .
b. Control rectifier defective --------
b. Replace control rectifier (para 6-9).
c. Replace dc coil (para 614).
c. Saturable reactor dc coil shorted,
grounded or open.
