.
A complete Parts List is available at www.MillerWelds.com
OM-254915 Page 52
SECTION 7
−
MAINTENANCE &TROUBLESHOOTING
7-1. Routine Maintenance
!
Disconnect power
before maintaining.
.
Maintain more
often during
severe conditions.
n
= Check
Z
= Change
~
= Clean
l
= Replace
* To be done by Factory Authorized Service Agent
Reference
Every
3
Months
l
Damaged Or Unreadable
Labels
l
Repair Or Replace
Cracked Weld Cable
~
Clean And Tighten Weld
Terminals
n
Check Gun Cable
l
Damaged Gas Hose
l
Cracked Or Damaged
Cord
Every
6
Months
OR
~
Inside Unit
~
Clean Drive Rolls
After
Each
Spool
Of Wire
~
Gun Liner
.
When using a 16 lb spool of wire per day, blow out gun liner after each spool of wire.
7-2. Overheating
Thermistors RT1 and RT2 protect the unit from damage due to overheating. If output diode heatsink or IGBT heatsink gets too hot, RT1 and/or RT2
opens and output stops. The fan keeps running to cool the unit. Wait several minutes before trying to weld.
7-3. Ground Clamp And Gun Connections
Clean and tighten ground clamp and gun connections. Be sure that ground clamp is connected to a clean, paint-free
surface on the workpiece.