HF scientific Oil Content Bilge Alarm - Manual (Page 11)

Bilge Alarm (02/02)
Rev. 1.3
XVII. TEST PROCEDURES FOR POWER SUPPLY BOARD (LOWER PC BOARD IN Figure 3)
1. Turn Power OFF.
2. Remove Amplifier P.C. Board (Item A, Figure 5).
3. Unplug the Front Panel Harness Plug from the Socket, Item B, Figure 5.
4. Unplug the voltage plug from the socket, Item C, Figure 6.
5. Plug into socket (Item H, Figure 5) the Dummy Test Plug (Part #80276, supplied with instrument).
6. Turn Power ON.
7. Using a D.C. Volt Meter measure the voltages at the test points, i.e. between common (com) and each test point
on Power Supply Board. They should be within + 10% of value indicated and they should be stable.
8. If the voltages are not as indicated on every test point then replace Power Supply Board.
9. After testing and replacing Power Supply Board, if required, then turn Power OFF.
10. Remove Dummy Test Plug and reinstall Amplifier P.C. Board and replace Front Panel Harness Plug in socket Item
C, Figure 6.
11. Reinstall the voltage plug into the voltage socket.
12. Turn Power ON.
XVI. TROUBLE-SHOOTING GUIDE (cont.)
SYMPTOMS PROBABLE CAUSE CORRECTIVE ACTION
Page 7
Readout shows negative.
When oil concentration as indicated
by the digital Display, goes above
Alarm Set Point, Controls stays in
“Overboard” condition and does not
change to “Recirculate.”
“Cal Check” reading too high (see
“Calibration Check”).
1. Cleaner oil free water.
2. Defective amplifier PC board.
3. Defective Digital Display.
1. Defective Alarm Relay.
2. Defective Amplifier Board.
3. Defective Failsafe Light Detector.
1. Dirty Sensing Module Source
Lamp.
2. Defective Sensing Module
Source Lamp.
3. Defective Measurement Detector
in Sensing Module.
1. Adjust zero. See “Start-up.”
2. Replace amplifier PC Board
(Item A, Figure 5) and re-
calibrate.
3. Replace complete Front Panel
Assembly.
1. Replace Relay.
2. Replace Amplifier PC Board
(Item A, Figure 5) and re-
calibrate.
3. Replace complete Front Panel
Assembly.
1. Clean Sensing Module
windows.
2. Check Sensing Module
Source Lamp and replace if
necessary.
3. Replace Measurement
Detector.