Servicing
Detector/Preamplifier Assembly Replacement
Thermo Electron Corporation Model 48i Instruction Manual 7-17
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Remove the optical bench following the “Optical Bench Replacement”
procedure in this chapter.
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.
Detector/Preamplifier
Assembly
Replacement
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
1. Turn 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.
3. Remove the two screws holding the preamplifier cover to the
preamplifier assembly and remove the cover.
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.
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.
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