Det-Tronics SW9200x Slickwatch IR Oil Detection System - Manual (Page 20)

Rear Panel P.C. Board
The Rear Panel p.c. board is attached to the side of the
motorbox next to the Connector/Relay p.c. board. The
Sync Demod and Options board must be removed
before the Rear Panel board can be removed.
To remove:
1. On the Connector/Relay p.c. board, remove the
STATUS ALARM and OIL ALARM relays from their
sockets.
2. Release the ribbon connector that connects the
Rear Panel board to the Connector/Relay board.
3. Remove the six screws that hold the Rear Panel
board to the motorbox tabs.
4. Pull the top of the Rear Panel board away from the
motorbox to release the two connectors at the top of
the board.
5. Being careful not to touch the sync pickoff with the
filterwheel, remove the board.
To replace:
1. Being careful not to touch the sync pickoff with the
filterwheel, slide the board into place.
2. Firmly press the connectors at the top of the board
into the mating connectors on the motorbox.
3. Attach and lock the ribbon connector to the
Connector/Relay p.c. board.
4. Replace the six screws that hold the Rear Panel
board to the motorbox tabs.
5. Examine the wire lug (connected to the green wire)
that is screwed to the Rear Panel board. Be sure
the lug does not short against any traces on the p.c.
board. It may be necessary to space the lug away
from the board with a small lockwasher.
6. Replace the STATUS ALARM and OIL ALARM relays
in their sockets on the Connector/Relay p.c. board.
Because the sync pickoff can easily be dislodged during
this procedure, check the sync pickoff connection after
replacement of the Rear Panel p.c. board.
AGC/TE Cooler P.C. Board
The AGC/TE Cooler board is mounted in the Detector/
Preamp assembly within the fins of the heat sink.
To remove:
1. Release the ribbon connector that connects the
AGC/TE Cooler board to the Preamplifier board,
which is permanently attached to the bottom of the
heat sink.
2. Holding the ribbon connector to the side, pull the
AGC/TE Cooler board so that the connector to the
motorbox disengages. Slide the board out of the
heat sink fins.
To replace:
1. Position the board so that the two parts of the con-
nector to the motorbox are lined up.
2. Holding the ribbon connector to the side, slide the
board into the fins of the heat sink as far as it will go,
so that the connector to the motorbox engages.
3. Attach and lock the ribbon connector from the
Preamplifier board.
Detector/Preamp Assembly
The Detector/Preamp assembly is comprised of the
infrared photodetector mounted inside a baffle, an opti-
cal filter, the heat sink and the permanently mounted
Preamplifier p.c. board. The Detector/Preamp assembly
is located on the top of the motorbox, beside the power
supplies.
NOTE
Exposure to direct light (particularly fluorescent light
or sunlight) can cause permanent damage to the
infrared photodetector. Care should be taken to
avoid exposing the photodetector to light when the
Detector/Preamp assembly is removed from the
instrument.
To remove:
1. Remove the four 6-32 screws that hold the assembly
to the motorbox.
2. Lift the assembly up until the baffle clears the motor-
box.
To replace:
1. Position the assembly over the motorbox so that the
connector and hole for the baffle are aligned.
2. Slide the assembly into place.
3. Replace the four 6-32 screws that hold the assembly
to the motorbox.
Sync Pickoff
The sync pickoff is mounted in a socket that is located in
the center of the Rear Panel p.c. board. The sync pick-
off is removed by pulling it from the socket. To replace
the sync pickoff, install with the red dot up (toward the
motorbox connectors).
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