Lincoln Electric INVERTEC 270SX Service Manual page 50

OUTPUT BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued)
I
Resistor R16
(68ohm 100W)
5. Remove the potting protection and unscrew the 16 screws that fix the 4 diodes modules (H) to the PCB.
6. Remove the potting ptotection and unscrew the 2 screws that fix the resistor R16 (I) to the PCB
7. Unscrew the 4 screws (L) and remove the output board printed circuit.
8. Remove the 8 screws that fix the 4 diode modules and the 2 screws that fix the resistor R16 to the heatsink. Keep
these 10 crews in a separate place as they are different from the ones that are fixing the diode modules to the
PCB. Clean the heatsink 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!
DISASSEMBLY OPERATIONS
W05X1043R for INVERTEC
L
L
Page 50
®
400SX
H
L
L
WARNING
Disconnect input power before servicing.
Do not operate with covers removed.
Do not touch electrically live parts.
Only qualified persons should install, use
ELECTRIC SHOCK
or service this equipment.
CAN KILL
Pay attention of how to
position the open end
mounting of diode
modules to heatsink.
Refering to the side
picture the open end
must be on the right side