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TROUBLESHOOTING & REPAIR PROCEDURES
Model 300E Carbon Monoxide Analyzer
Instruction Manual
196
P/N 04288 Rev: A
11.1.4.2. Sync Demodulator Status LED’s
Two LED’s located on the Sync/Demod Board and are there to make it obvious that
the GFC Wheel is spinning and the synchronization signals are present:
Table 11-3: Sync/Demod Board Status Failure Indications
LED Function Fault
Status
Indicated
Failure(s)
D1 M/R
Sensor
Status
LED is stuck
ON or OFF
§
GFC Wheel is not turning
§
M/R Sensor on Opto-Pickup Board failed
§
Sync/Demod Board failed
§
JP 4 Connector/Wiring faulty
§
Failed/5 VDC Power Supply
(PS1)
D2 Segment
Sensor Status
LED is stuck
ON or OFF
§
GFC Wheel is not turning
§
Segment Sensor on Opto-Pickup Board
failed
§
Sync/Demod Board failed
§
JP 4 Connector/Wiring faulty
§
Failed/5 VDC Power Supply
(PS1)
D1 – M/R Sensor Status
D2 – Segment Sensor Status
JP4 Connector to Opto-Pickup
Board
Figure 11-4: Sync/Demod Board Status LED Locations