Detector/Preamplifier Assembly Replacement - Thermo Scientific 48i Instruction Manual

Servicing

Detector/Preamplifier Assembly Replacement

Detector/Preamplifier
Assembly
Replacement
7-18 Model 48i Instruction Manual
3. Remove the two screws holding each heater to the bottom of the
optical bench, and remove both heaters and the heater board assembly.
4. Apply heat conductive compound to the bottom of the heaters and
install the new heaters and heater board assembly.
5. Calibrate the instrument. Refer to the "Calibration" chapter in this
manual.
Use the following procedure to replace the detector/preamplifier assembly
(Figure 7–9).
Equipment Required:
detector/preamplifier assembly
Allen wrenches, 3/32-inch and 7/64-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.
1. Turn the instrument OFF, unplug the power cord, and remove the
cover.
2. Disconnect the cable from the PREAMP connector on the
measurement interface board and disconnect the two wires from the
top of the chopper motor plate.
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