Hvps (High Voltage Power Supply) - Teledyne 6200A Manual

TAI Model 6200A SO
5. Pull out PMT, LED, and thermistor carefully from the cooler block. Be careful not to
contaminate the window of the PMT with thermal compound of thermistor. PMT is fragile,
so handle carefully.
6. Replace two desiccant bags inside of the PMT housing with new bags.
7. Replace cooler assembly (P/N 01461) and assemble by reversing above steps.

9.3.10 HVPS (High Voltage Power Supply)

The HVPS is located in the interior of the Sensor Module, and is plugged into the PMT tube. It
requires 2 voltage inputs. The first is +15VDC which powers the supply. The second is the
programming voltage which is generated on the Preamp Board. The test procedure below allows
to test HVPS. Adjustment of the HVPS is covered in the Factory Calibration Procedure in
Section 9.1.6.
To troubleshoot the HVPS:
1. While sampling stable SO
function.
2. Change HVPS voltage about 50V lower than the current setting by adjusting S2 and S1 on
the preamp board. If PMT reading on the display drops about 40±10% from the previous
reading, then HVPS is working properly.
3. If PMT reading does not drop , then do ELECTRIC test per 9.1.3.2.
4. If ELECTRIC test is working properly, then do OPTIC test per 9.1.3.3.
If all above are checked properly, then problem is either PMT or HVPS. Check HVPS as followings
Turn off the instrument.
5. Remove the cover and disconnect the 2 connectors at the front of the SO
6. Remove the end plate from the PMT housing.
7. Remove the HVPS/PMT assembly from the cold block inside the sensor. Un-plug the PMT
tube.
8. Re-connect the 7 pin connector to the Sensor end cap, and power-up the instrument.
Analyzer Operator Manual, 02164, Rev. G
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gas, record PMT reading and HVPS reading of the TEST
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PMT housing.
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