Servicing
Detector/Preamplifier Assembly Replacement
Thermo Fisher Scientific
Model 15
i
Instruction Manual
7-19
Optical Bench
Figure 7–9.
Replacing the Detector/Preamplifier Assembly
5.
Install the new detector assembly by following the previous steps in
reverse.
6.
Calibrate the preamp board, and then return to Step 7 to set S/R. Refer
to the “
Preamp Board Calibration
” procedure that follows.
7.
Set S/R as follows:
a.
From the Main Menu, choose Service >
Initial S/R Ratio.
The Initial S/R Ratio screen appears.
b.
At the Initial S/R Ratio screen, press
to select set the initial
S/R ratio to the value of the current ratio and press to store the
value. The initial S/R ratio should be between 1.05 and 1.15.
Note
If Service Mode is not displayed, refer to “
Accessing the Service
Mode
” on page
7-4
, then return to the beginning of this step.
▲
8.
Calibrate the instrument. Refer to the “
Calibration
” chapter in this
manual.
Preamp Cover
Detector Assy
Access Holes
Preamp Board
To Motor Plate
To PREAMP on Measurement
Interface Board
Содержание 15i
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