Lincoln Electric MULTI-SOURCE SVM155-A Service Manual page 82

F-54
SCR BRIDGE / HEAT SINK ASSEMBLY REPLACEMENT PROCEDURE
Bridge
Assembly
Mount
REMOVAL PROCEDURE
1. Disconnect input power to the machine.
2. Using a 3/8" nut driver, remove the case
sides and roof.
3. Locate, label, and remove leads #301 and
#264 from the thermostat. See Figure F.26.
TROUBLESHOOTING & REPAIR
FIGURE F.26. Bolt and Lead Locations
MULTI-SOURCE
9/16" Bolts
L E F T S I D E L E F T S I D E
4. Lower the control panel using a 3/8" nut
driver.
5. Remove plug J4 from the firing board and
feed the disconnected plug down through
the hole in the bottom of the P.C. board
control box.
F-54
#264
#301