Lincoln Electric NA-3 Service Manual page 98

F-33
PC BOARD(S) REMOVAL AND REPLACEMENT
TEST PROCEDURE
Before starting the following procedure, refer
to the PC Board Troubleshooting Procedures
at the beginning of this section.
1. Remove the input power to the NA-
3/NA-4 control box.
2. Loosen the thumb screw and swing
open the outer control panel.
3. Using the slot head screwdriver
remove the locking screw and swing
open the inner control panel.
4. Carefully remove the molex-type
plugs connected to the PC board that
is to be removed.
5. Using the Phillips head screwdriver,
remove the PC board mounting
screws.
6. Carefully remove the PC board.
TROUBLESHOOTING AND REPAIR
(continued)
NA-3 AND NA-4
FIGURE F.9 – CIRCUIT BOARD
REMOVAL AND REPLACEMENT.
MOLEX-TYPE
PLUG
PC BOARD
MOUNTING
SCREWS
F-33