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Teledyne API M100E Analyzer Operation Manual Troubleshooting & Repair
277
Table 12-9: Example of HVPS Power Supply Outputs
If HVPS reading = 700 VDC
PIN PAIR NOMINAL READING
1 2 70 VDC
2 3 70 VDC
3 4 70 VDC
4 5 70 VDC
5 6 70 VDC
6 7 70 VDC
7 8 70 VDC
KEY
5
6
7
8
9
10
11
1
2
3
4
8. Turn off the instrument power, and re-connect the PMT tube, and then re-assemble the sensor.
If any faults are found in the test, the HVPS must be replaced. There are no user serviceable parts inside the HVPS.
12.6.14. PNEUMATIC SENSOR ASSEMBLY
The pressure/flow sensor circuit board, located behind the sensor assembly, can be checked with a voltmeter
using the following procedure, which assumes that the wiring is intact and that the motherboard and the power
supplies are operating properly.
Measure the voltage across TP1 and TP2, it should be 10.0 0.25 V. If not, the board may be faulty.
Measure the voltage across capacitor C2; it should be 5.0 ± 0.25 V. If not, the board may be faulty.
12.6.14.1. SAMPLE PRESSURE
Measure the voltage across test points TP1 and TP4. With the sample pump disconnected or turned off, this
voltage should be 4500 250 mV. With the pump running, it should be about 0.2 V less as the sample pressure
drops by about 1 in-Hg-A from ambient pressure. If this voltage is significantly different, the pressure transducer
S2 or the board may be faulty. A leak in the sample system to vacuum may also cause this voltage to be
between about 0.6 and 4.5. Ensure that the front panel reading of the sample pressure is at about 1 in-Hg-A less
than ambient pressure.
04515F DCN6048