Lincoln Electric INVERTEC 270SX Service Manual page 48

OUTPUT BOARD REMOVAL AND REPLACEMENT PROCEDURE (continued)
I
G
H
I
4. Remove the potting protection and unscrew the 6 spacers (F), the 6 screws (G) and the 2 screws (H).
5. Unscrew the 4 screws (I) and remove the output board printed circuit.
L
M
Resistor R13
(100ohm/100W)
6. Remove the 6 screws (L) that fix the diode modules and the 2 screws (M) that fix the resistor R13. Keep these 6
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
W05X1044R for INVERTEC
Page 48
®
270SX
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
I
F
I
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 left side