Servicing
Input Board Calibration
7-28 Model 42i Low Source Instruction Manual Thermo Electron Corporation
7. Re-install the measurement bench. Refer to “Removing the
Measurement Bench and Lowering the Partition Panel” in this chapter.
8. Perform an input board calibration. See the “Input Board Calibration”
procedure that follows.
Input Board
Calibration
After replacing the input board, use the following procedure to calibrate the
input board.
1. From the Main Menu, press to scroll to Service > press >
to scroll to Input Board Calibration > and press .
The Input Board Calibration screen appears.
If the Service Mode is not displayed on the Main Menu, use the
following procedure to display it.
a. At the Main Menu, press to scroll to Instrument Controls >
press > to scroll to Service Mode > and press .
The Service Mode screen appears.
b. Press to toggle the Service Mode to ON.
c. Press > to return to the Main Menu.
d. Continue the procedure at the beginning of Step 1 to access the Set
PMT Voltage screen.
2. At the Input Board Calibration screen, press to select Manual
Input Cal, and press to calibrate.
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.
WARNING The service procedures in this manual are restricted to qualified
service representatives.
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