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Troubleshooting and ServiceTeledyne API – Model T300/T300M CO Analyzer
12.5.7.2. ELECTRICAL TEST
12.5.7.3. OPTO PICKUP ASSEMBLY
12.5.7.4. GFC WHEEL DRIVE
The electric test function substitutes simulated signals for CO MEAS and CO REF,
generated by circuitry on the sync/demod board, for the output of the IR photo-detector.
While in this mode the user can also view the same test functions viewable from the
main SAMPLE display. When the test is running, the concentration reported on the
front panel display should be 40.0 ppm. Also see Section 5.9.4.
Operation of the opto pickup PCA (P/N 04088) can be verified with a voltmeter.
Measure the AC and DC voltage between digital ground on the relay board, or
touchscreen and TP2 and TP4 on the sync pickup PCA. For a working board, with the
GFC motor spinning, they should read 2.4 ±0.1 VAC and 2.5 ±0.15 VDC.
Further confirmation that the pickups and motor are operating properly can be obtained
by measuring the frequency at TP2 and TP4 using a frequency counter, a digital
voltmeter with a frequency counter, or an oscilloscope, per Table 12-9.
Table 12-9:
Opto Pickup Board Nominal Output Frequencies
AC Mains Freq.
50 Hz
60 Hz
If the D1 and D2 on the sync demodulator board are not flashing then:
Teledyne Analytical Instruments
Nominal Measured Frequency
TP2
TP4
25
30
300
360
260
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Troubleshooting
