Troubleshooting and repair, Repair procedure, Pc board replacement – Lincoln Electric LN-8 SVM132-A User Manual
Page 83
F-33
TROUBLESHOOTING AND REPAIR
F-33
REPAIR PROCEDURE
1. Observe the static precautions
detailed in the PC Board
Troubleshooting Procedures at
the beginning of this section.
2. Using the 5/16 in. nutdriver,
remove the screws from the left
side cover assembly.
CAUTION: Label all wires and connec-
tors prior to removal. All wires and con-
nectors must be reconnected to the
same terminals from where they were
removed. Improper connection may
lead to component damage or machine
malfunction.
VARIABLE VOLTAGE BOARD
REMOVAL AND REPLACEMENT
1. Disconnect all plugs and connec-
tors that can be reached without
removing the variable voltage PC
board. Refer to Figure F.10.
2. Using a Phillips screwdriver,
remove the screws that secure the
variable voltage PC board to the
case.
NOTE: The screws that secure the
Variable Voltage PC board are on the
wire drive assembly side of the unit.
3. Carefully move the PC board away
from the case, checking to ensure
that all plugs and connectors have
been removed. Disconnect any
connectors that have been missed
or that could not be reached while
the PC board was installed.
4. Place the new PC board into the
case and install the mounting
screws.
5. Connect all plugs and connectors
to the PC board in the same loca-
tion they were removed from.
6. Install the screws that secure the
left side cover assembly.
LN-8
PC BOARD REPLACEMENT
(continued)
FIGURE F.10 – PC BOARD LOCATIONS
VARIABLE
VOLTAGE
PC BOARD
CONTROL
PC BOARD
RELAY
PC BOARD