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8.1.5
Stopped Chopper Wheel
The signal reaching the detector is chopped by a rotating wheel driven by a precision current
motor. A forceful jolt, such as dropping the instrument or banging it, could cause the wheel to
stop. This problem can be identified by the absence of the motor's characteristic whining sounds
as it rotates. The output may produce a non-rising low reading even when looking at high
levels. Inspect the wheel and motor for physical damage. If power is applied and the wheel will
not rotate, check to see if the wheel is hanging up on any obstruction.
Caution: DO NOT attempt to bend the wheel or motor bracket. Instead, loosen the
bracket mounting screws and re-adjust it slightly until free movement is obtained.
8.1.6
Broken Wire Harness
Caution: The disassembly of the Electro-Optical Package will result in the voiding of
the Limited Warranty.
If the instrument appears to be working correctly but the recording or control attachments are
not receiving the proper signals, the problem may be due to a broken wire in the
interconnecting cables. Using field mA and mV calibrators or an ohm meter, check for continuity
of all wiring.
E
T QUASAR Flare Monitors Operation Manual
2
Troubleshooting • 48
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