Lincoln Electric CITOTIG 315DC Service Manual page 57

REMOVAL PROCEDURE
Necessary tool:
- Screwdriver type PH02
1. Remove main input power to the CITOTIG 315DC or 415DC
2. Follow the case removal procedure available in this Service Manual
3. Perform the Discharge procedure
4. Disconnect the connectors J1,J2,J3,J4,J5,J6,J7 and the ground connection from the input board. See
Fig.1
5. Using a screwdriver type PH02 remove the 6 screws (A) that fix the input bridge on the input board, the
3 screws that fix the three phases input cables (B) and the 2 screws that fix the DC+ and DC- cables (C)
. See Fig.2.
6. Using the screwdriver remove the 6 screws (D) that fix the input board to the machine central frame. See
Fig.3.
7. Remove the input board from the machine.
8. If the input bridge needs to be replaced remove the 2 screws that fix it to the machine frame and replace
it taking care to clean very well the machine frame from the old thermal compound and any dirty. To re-
assembly correctly the new input bridge, follow the instruction that are inside the new input bridge box.
9. For the Input 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.
DO NOT USE CORDLESS SCREWDRIVERS FOR THE POWER MODULEs!
WARNING !
Remember to connect ground lead to the
male terminal on the input board corner.
D
58
Fig.3