Sears Craftsman 934.20105 Owner's Manual page 32

MAINTENANCE AND TROUBLESHOOTING Page 30
NOTHING WORKS BUT
FAN IS ON
LOW OUTPUT OR
NON-PENETRATING WELD
WtRE "BIRDNESTING" AT
DRIVE ROLLER
Exceeded duty cycle; thermal
protector opened circuit
Faulty rectifier
Faulty transformer
(extremely rare)
Loose connection inside
the machine
Too long or improper
extension cord
Wrong type or size of wire
Wrong type of gas or no gas
Poor ground connection
Wrong polarity
Wrong size contact tip
Loose gun connection
or faulty gun assembly
Too much tension
on drive roller
Gun assembly not completely
seated into drive assembly
i ii ir
Allow welder to cool at least 10
minutes with fan running
(observe duty cycle)
Replace rectifier
Replace transformer
Blow inside of machine out
with compressed air clean and
tighten all connections
See manual under
extension cord use
Check manual for proper
wire size or type
Check manual and change gas
Reposition clamp and check
cable to clamp connection
Change polarity
Use proper size tip
Tighten gun connection
or replace gun
Adjust drive tension
(see manual)
See gun assembly
instruction in manual