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Photometer Lamp
Replacement
(Photometer option)
Thermo Fisher Scientific
5. Replace the LCD module by following previous steps in reverse.
The lamp control system of the Model 146i Photometer option has been
designed to operate the lamp conservatively to increase its life. However, the
lamp should be replaced when any one of the following conditions occur:
•
No light output.
•
Inability to adjust lamp position to obtain an output detection
frequency of 65 kHz.
•
Noisy output signal, which has been traced to an unstable lamp (see the
"Troubleshooting" chapter).
Note It is not necessary to recalibrate the Model 146i since it is a ratio
instrument and replacing the lamp does not affect the calibration. However,
after replacing the photometer lamp, you must adjust the photometer lamp
voltage to ensure proper operation. Refer to the "Photometer Lamp Voltage
Adjustment" procedure that follows to adjust the photometer lamp voltage
Use the following procedure to replace the photometer lamp
Equipment required:
Allen wrench, 1/16-inch
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly grounded antistatic wrist strap must
be worn while handling any internal component.
Use the following procedure to replace the photometer lamp.
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Disconnect the photometer lamp cable from the LAMP connector on
the photometer board.
3. Slide the insulation off the end of the lamp.
4. Loosen the Allen screw on the lamp clamp.
Photometer Lamp Replacement (Photometer option)
(Figure
Model 146i Instruction Manual
Servicing
7-12).
7-31
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Troubleshooting
