Servicing
Detector/Preamplifier Assembly Replacement
7-18
Model 15
i
Instruction Manual
Thermo Fisher Scientific
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.
3.
Remove the two screws holding the preamplifier cover to the
preamplifier assembly and remove the cover.
4.
Insert an Allen wrench through the access holes in the preamplifier
printed circuit board, and remove the screws holding the detector
assembly to the optical bench. Carefully remove the detector assembly
from the optical bench.
Detector/Preamplifier
Assembly
Replacement
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