Lincoln Electric CITOTIG 315DC Service Manual page 59

OUTPUT BOARD REMOVAL AND REPLACEMENT PROCEDURE
G
J31
A
C
J32
F
G
REMOVAL PROCEDURE
Necessary tool:
- Screwdriver type PH02
- A small flat bladed screwdriver
- 7 mm nut driver
- Torque wrench
1. Remove main input power to the CITOTIG 315DC
2. Follow the case removal procedure available in this Service Manual
3. Perform the Discharge procedure
4. Disconnect the connectors J31, J32 and J34
5. Using the small flat bladed screwdriver remove the two thermostat wires from connector (A)
6. Using the 7 mm nut driver remove the two (2) nuts (B) and the related bolts. Remove the plastic tie that
fix the Hall sensor probe and remove it from the copper bar.
7. Using the screwdriver type PH02 remove the three (3) power harnesses screws (C)
8. Remove the three (3) terminals (D)
9. Remove the potting protection and unscrew the 16 screws (E) that fix the board to the output diode
modules
10. Remove the potting protection and unscrew the 2 screws (F) that fix the board to the power resistor R17
11. Unscrew the 4 screws in the corners of the output PCB (G)
12. Remove the output PCB from the machine.
13. Remove and use on the new output board the copper bars.
14. If one or more diode modules need to be replaced remove the 2 screws that fix each of them to the
output heat-sink and replace them taking care to clean very well the heat-sink from the old thermal
compound and any dirty. To re-assembly correctly the new diode modules apply the thermal compound
thin layer (0,1-0,2 mm) under each ISOTOP component. Screw torque 1,2/1,4 N/m (0.030/0.033 N/inch)
15. For the output Board re-assembly operations, make the previous steps in the reverse order and add
silicon to the zones where the potting protection was removed. ATTENTION ! : use silicon type with low
acetic, viscosity and adhesive grade.
DISASSEMBLY OPERATIONS
W05X1327 for CITOTIG 315DC
E
E
E
D
G
E
PAY ATTENTION ! of how to position the open end mounting
of modules to heat-sink.
See printed circuit board for reference
60
J34
G
B