Thermo Scientific 42i Instruction Manual page 209

Input Board
Calibration
DC Power Supply
Replacement
Thermo Fisher Scientific
After replacing the input board, use the following procedure to calibrate the
input board.
WARNING The service procedures in this manual are restricted to qualified
service representatives.
1. From the Main Menu, press
to scroll to Input Board Calibration > and press
The Input Board Calibration screen appears.
Note If Service Mode is not displayed, refer to
Mode" on page 7-4 , then return to the beginning of this step.
2. At the Input Board Calibration screen, press
Input Cal, and press
The screen displays the frequency at GAIN 1.
3. Make a note of the FREQ value displayed at GAIN 1, then press
or to change the GAIN to 100.
4. At the GAIN 100 screen, use
until the FREQ value matches or is slightly above (within 50 counts)
the value noted in the previous step.
5. Press to store the value.
The screen flashes Calculating - Please Wait! and Done - Values
Saved! messages.
Use the following procedure to replace the DC power supply
14).
Equipment Required:
DC power supply
Philips screwdriver
▲
to scroll to Service > press
to calibrate.
Servicing
Input Board Calibration
.
"Accessing the Service
▲
to select Manual
to increment the D/A counts
(Figure 7–
Model 42i Instruction Manual
>
7-25