Det-Tronics SW9200x Slickwatch IR Oil Detection System - Manual (Page 19)

CORRECTIVE MAINTENANCE
GENERAL INFORMATION
The SW9200 electronics, located in the receiver, are comprised of six printed circuit boards and electrical wiring and
components located on the Receiver Baseplate and the Motorbox. Two of the printed circuit boards are permanently
mounted and the other four are easily removed and replaced as indicated below:
P.C. BOARD PERMANENT OR REMOVABLE
Preamplifier permanent
AGC/TE Cooler removable
Synchronous Demodulator removable
Rear Panel removable
Options removable
Connector/Relay permanent
The receiver functions described in Section 1 and Figure 1 of this manual are located on a printed circuit board or
assembly as shown below:
RECEIVER FUNCTION LOCATION
Infrared Photodetector Detector/Preamp Assembly
Sync Circuitry Rear Panel and Sync Demod p.c. boards
Amplifier Preamp and Sync Demod p.c. boards
Signal Processing Electronics AGC/TE Cooler and Sync Demod p.c. boards
Ratiometer Rear Panel p.c. board
Threshold Detector Rear Panel p.c. board
Obstruction/Status Alarm Relay Connector/Relay p.c. board
Adjustable Threshold Detector Rear Panel p.c. board
OIL Alarm Set Rear Panel p.c. board (accessed from front panel)
Oil Alarm Relay Connector/Relay p.c. board
4-20 mA Converter Options p.c. board
Assemblies and printed circuit boards are available as spare parts. To facilitate troubleshooting and corrective main-
tenance of the SW9200, users are advised to stock the items listed in the Recommended Spare Parts List.
P.C. BOARD AND ASSEMBLY REPLACEMENT
(See Figure 3 for locations)
Synchronous Demodulator and Options P.C. Boards
The Sync Demod board is located to the left and the Options board is located to the right of the filterwheel motor
inside the motorbox. Remove either board by pulling it out of its connector on the Rear Panel p.c. board and sliding it
through the card guides out of the motorbox. To replace the Sync Demod or Options board, make sure that the notch
on the board matches the key in the connector and slide the board along the card guides into the motorbox. Make
sure that the board is seated firmly in the connector.
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