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PK-232 TECHNICAL MANUAL
CHAPTER 5 – MECHANICAL ASSEMBLY AND DISASSEMBLY
DISCONNECT ALL POWER FROM THE PK-232 BEFORE OPENING THE PK-232 CASE. FAILURE TO
DISCONNECT THE POWER SOURCE MAY DAMAGE THE PK-232!!
5.1.
Cover Removal
o
Disconnect all connectors from the rear of the PK-232.
o
Remove six black anodized #6 Phillips head screws from the sides and rear of the
cover.
o
Slide the cover towards the rear of the unit until the connectors clear the cutouts on
the rear of the cover.
o
Lift the cover and carefully tip it reward. You will see a black wire and a red wire
connected from the circuit board to the battery holder fastened to the cover. Use
caution not to break these wires. The leads are long enough to allow the cover to
be set on edge next to the chassis without disconnecting the wires from the board.
5.2.
Circuit Board Removal
Refer to the Printed Circuit Board Drawing, Figure 4 in APPENDIX C, for the locations of the
jumpers and other components.
o
Remove the jumper from JP-1 to disconnect the battery backup voltage from the
RAM circuit. All preset parameters will be lost and will have to be reentered when
the unit is powered up.
o
With a small blade screwdriver, loosen the screw holding the control knob to the
shaft of the THRESHOLD control and remove the knob.
o
Remove the control nut and control washer.
o
Unsolder the red and black leads where they enter the circuit board. This can be
done from the top of the circuit board.
o
Slide the circuit board towards the rear of the chassis until the control shaft clears
the front panel hole and lift the circuit board clear of the chassis.
PK232TM Rev. A 5/87
CHAPTER 5 – MECHANICAL ASSEMBLY/DISASSEMBLY
CAUTION
5-1
Page 34
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Troubleshooting
