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TROUBLESHOOTING & REPAIR
PRO-CUT 60
F-42
TRANSISTOR MODULE REMOVAL
REMOVAL/REPLACEMENT
PROCEDURE
NOTE: It is recommended that when
the Transistor Module is replaced,
the Power Board and the Control
Board should be replaced.
NOTE: See Figure F.15.
1. Disconnect input power to the
machine.
2. Remove the Left Case Side
assembly.
3. Perform the CAPACITOR
DISCHARGE PROCEDURE.
4. Perform the POWER BOARD
REMOVAL PROCEDURE.
5. Remove the two socket head
cap screws from the Transistor
Module using the 5mm Allen-
Type wrench.
6. Remove the Transistor Module
from the heat sink.
7. Install the replacement
Transistor Module.
a. Clean the heat sink surface
with “000 fine steel wool.
b. Rinse the heat sink surface
with alcohol or acetone.
c. Apply a .002” to .005” coat
of joint compound evenly to
the heat sink mounting
surface and the Transistor
Module mounting surface.
Use Lincoln Joint
Compound T12837, or
equivalent, such as Dow
Corning #340.
d. Press the Transistor Module
onto the heat sink surface.
Remove the module to make
sure enough joint compound
has been applied. When
removed, both surfaces
should have an even texture
with no bare spots. If this
even-textured look does not
appear, re-apply the joint
compound.
e. Mount the Transistor Module
on the heat sink with the
5mm socket head cap
screws to 26 in/lbs. Partially
tighten each cap screw one
at a time to avoid uneven
torque on the base plate.
8. Install replacement Power
Board. See POWER BOARD
REMOVAL PROCEDURE.
TRANSISTOR
MODULE
SOCKET HEAD
CAP SCREWS
(TORQUE TO
26 IN/LBS (2.9 N/M))
FIGURE F.15-Transistor Module loca-
tion with Power Board Removed