5. Remove the fixing screw holding the fan socket to the mounting plate and unplug the fan from the
detector head.
6. Discard the failed fan and fit a replacement fan in reverse order of disassembly.
7. Reconnect the detector head to the base and to the Junction Box, ensure that the fault does not
reoccur.
5.2.7 LED Fault
As part of the oil mist measurement process light is passed across the sample chamber to illuminate
the oil mist particles in the sampled air. Over time condensing oil can build up on the sample chamber
walls causing the light in the sample chamber to be reduced. When an optics test is performed the OMD
Mk6 Detector monitors the level of light passing through the sample chamber and produces a fault
indication if the light level drops below a predetermined limit set as part of the detector production
process.
If the light level in the sample chamber falls below the allowed limit the detector will communicate the
fault to the Control Panel. The Control Panel will then indicate an LED fault, see section 5.1.1.
Figure 147 LED Fault
An inspection of the engine event log, see section 3.6, will list the event:
LED Fault Eng X det Y
Clean the detector, see section 4.4 for proper Detector Head removal, cleaning and refitting. Ensure
Detector Heads & Detector base O-Ring seals are properly fitted with Molykote O-Ring Lubricant.
5.2.8 PSU Fault
The power supply to the Control Panel is constantly monitored to ensure it is within the required limits,
18 31.2v. If the power supply is outside these limits a power supply fault is indicated.
Figure 148 Power Supply Fault
Control Panel Fitted with Interface Board, 1-44782-K183
1. Using a multi-meter measure the input power supply voltage at the Supply 1 and Supply 2 terminals
on the Interface Board.
If the measured voltage is outside the limits 18 31.2v the power supply should be investigated.
2. Inspect the Interface Board in the Control Panel. The two gree
be on.
If the Interface Board has a single power supply connection and only one LED is on place a short
wire link between the Supply 1 and Supply 2 24v terminals.
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