Removal and Installation Procedures
1.
Unplug all connectors from the Fuse circuit board.
2.
Remove the two screws, lock washers, and flat washers securing the top
of the circuit board.
3. Remove the screw, lock washer, and flat washer securing the right bottom
comer of the circuit board. See note below.
wore
Removal of the screw in step 3 may be difficult. Removing the
appropriate screw from the rear of the power
supply,
securing the
stand-off post between the circuit board and
heatsink,
Is
easier.
4.
With a pair of pliers, pinch the board retainer, located at the bottom left, so
that the circuit board can be pulled loose.
Returning the connectors to Improper locations may damage the
Laboratory DC Power Supply when power is applied.
5. Installation of the Fuse circuit board is done in the reverse order.
AC Selector Circuit
Board Removal
The AC Selector circuit board is located at the left rear of the power supply
behind the Fuse circuit board. See Figure 6-3 for the location of the AC Selec-
tor circuit board. To aid in locating the connectors referred to In this procedure,
see Figure 9-8 in the Diagrams section. The removal of the Fuse circuit board
is necessary before proceeding with this procedure.
NOTE
Remember to label each wire as you disconnect them.
1.
Remove the four self-tapping screws from the rear panel securing the AC
selector circuit board.
NOTE
The next two steps involve unsoldering eight
wires.
Some of the
colors of the wires are duplicated but are NOT interchangeable.
Make certain that each wire is returned to its proper location. The
colors of the wires mentioned in this procedure are subject to
change due to vendor component manufacturing.
REV AUG
1991
Maintenance
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