Servicing
PMT High Voltage Power Supply Replacement
7-16 Model 42i Low Source Instruction Manual Thermo Electron Corporation
cover plate (Figure 7-9). If the cooler fan is attached, unplug the fan
power cord if necessary.
Figure 7-9. Replacing the PMT
4. Remove the three retaining screws holding PMT base assembly to the
cooler using a 5/16-inch nut driver.
5. Pull the PMT and PMT base from cooler assembly by twisting it slightly
back and forth.
6. To install PMT, follow previous steps in reverse making sure to backfill
the cooler with dry air or nitrogen prior to replacing the PMT.
7. Perform a photomultiplier tube calibration. See “Photomultiplier Tube
Calibration” in the “Operation” chapter.
PMT High Voltage
Power Supply
Replacement
Use the following procedure to replace the PMT high voltage power supply
(Figure 7-10).
Equipment Required:
PMT Cover Plate Screws (3)
PMT Shroud Screws (4)
PMT Base Screws (3)
PMT Base Assembly
Equipment Damage Do not point the photomultiplier tube at a light
source. This can permanently damage the tube.
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