TM 5-3431-203-15
4-9. Welding Machine Smokes Excessively
4-14. Welding Machine Operates Erratically
Probable cause
Possible remedy
Main transformer
Replace transformer (para
Probable cause
Possible remedy
defective.
4-34).
Diodes defective ---------- Replace diodes (para
Accessory transformer
Replace transformer (para
defective.
4-32).
424).
4-10. Polarity Cannot be Selected
Control rheostat
Replace rheostat (para
Probable cause
Possible remedy
Polarity switch defective ___ Replace switch (para
defective,
4-20) .
4-19) .
4-11. Range Cannot be Selected
Range switch contacts
Clean or straighten contacts
Probable cause
Possible remedy
or replace switch (para
dirty, greasy, or bent.
Range switch defective ____ Replace switch (para
4-18) .
4-12. Welding Machine has Internal Arcing
4-15. Contactor Breaks Circuit
Possible remedy
Probable cause
Diode connections loose ----Tighten diode connections
Possible remedy
Probable cause
Wiring shorted --------------Repair or replace wiring
4-13. Welding Machine Fails to Start
Possible remedy
Probable cause
Replace transformer
Main transformer
defective.
Replace transformer (para
Main transformer
Wiring defective ____ ___.Repair or replace wiring
4-34).
shorted.
Section V. CONTROL PANEL AND TIMER RECEPTACLES
(2) Install the amperage switch (para
4-16. Control Panel
3-40).
a. Removal.
(3) Install the contactor switch (para 3-
(1) Remove the welder top and housing
41).
(4) Install the remote receptacle (para
(2) Remove the high frequency panel as-
3-38).
sembly (para 3-27).
( 5 ) Install the ground and electrode ter-
(3) Remove the control rheostat (para
minal board (para 3-7).
4-20).
(4) Remove the range switch (para 4-
(6) Install the polarity switch (para 4-
18).
19).
(5) Remove the polarity switch (para 4-
(7) Install the range switch (para 4-18).
19).
(8) Install the control rheostat (para 4-
(6) Remove the ground and electrode
20).
terminal board (para 3-47).
( 9 ) Install the high frequency panel as-
(7) Remove the remote receptacle ( para
sembly ( para 3-27 ).
3-38).
(10) Install the welder top and housing
(8) Remove the contactor switch (para
3-41).
(9) Remove the amperage switch (para
.
-
4-17. Timer Receptacles
(10) Refer to figure 4-2 and remove the
control panel.
a. Removal.
b. Installation.
(1) Refer to figure 4-2 and install the
(1) Remove the high frequency panel as-
control panel.
sembly ( para 3-27).