INVERTEC V300-I
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F-55
TROUBLESHOOTING & REPAIR
9. Insert each of the two hex head screws
into the Capacitor terminal holes and
thread finger tight. Be careful not to
cross thread the screws.
10. Torque both sets of screws in 10 inch-
pound increments using a diagonal
tightening sequence. Torque the four
socket head screws to 44 inch-pounds
(5 Nm). Torque the two hex head
screws to 55 inch-pounds (6 Nm).
11. Reconnect all the leads to the PC
board. Double check that each lead is
connected to the correct terminal.
Failure to reconnect the leads correctly
can result in machine damage when the
power is applied.
12. Perform the “Test After Repair of Switch
Boards and/or Capacitors”.
NOTE: Always make sure that Switch
Boards are changed in matched pairs.
Never mix an old style (different part num-
ber) Switch Board with a new style (new
part number).
3. Remove the two 7/16” head Capacitor
screws located in the center of the
Switch Board. Hold the PC board firmly
while doing this.
4. Remove the Switch Board carefully.
5.
Clean the heat sink surfaces thoroughly
to remove all the heat sink compound.
During machine operation, this com-
pound helps conduct heat from the PC
board to the heat sinks.
6. Apply a thin layer (.002”) of Dow 340
Heat Sink Compound to the mounting
surfaces of the new PC board and to
the Capacitor terminals. DO NOT allow
the compound to enter the mounting
screw holes because it can distort the
torque values.
7. Prepare to mount the new PC board on
the heat sink by first lining up the
mounting holes. Then press the PC
board into place.
8. Insert each of the four socket head
screws into the mounting heads and
thread finger tight. The threads are soft
— be careful not to cross thread the
screws.
SWITCH BOARD REPLACEMENT
(continued)
