Lincoln Electric INVERTEC 270SX Service Manual page 46

INVERTER BOARD IGBT REMOVAL AND REPLACEMENT PROCEDURE
REMOVAL PROCEDURE
Necessary tools:
- Phillips screwdriver PH02
1. Unscrew the 8 screws (2 for each IGBT) between every IGBT and heat sink (A)
2. Remove the IGBTs and clean the heat sink from the residual thermal compound
For the re-assembly operations, make the previous steps in the reverse order. Add silicon to the zones where the
potting protection was removed.
ATTENTION: use silicon type with low acetic, viscosity and adhesive grade.
NOTE: apply the thermal compound thin layer (0,1-0,2 mm)
under each isotop component before the re-assembling.
Screw torque 1,2/1,4 N/m (0.030/0.033 N/inch);
DO NOT USE CORDLESS SCREWDRIVERS FOR THE POWER MODULEs!
PAY ATTENTION ! of how to position the open end mounting of modules to heatsink.
Damages on new component if this is incorrect.
See printed circuit board for reference.
DISASSEMBLY OPERATIONS
Page 46
WARNING
ELECTRIC SHOCK
CAN KILL
A
Disconnect input power before servicing.
Do not operate with covers removed.
Do not touch electrically live parts.
Only qualified persons should install, use
or service this equipment.