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DC Power Supply
Replacement
Thermo Fisher Scientific
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
15).
Equipment Required:
DC power supply
Philips screwdriver
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 instrument OFF, unplug the power cord, and remove the cover.
2. Disconnect all the power supply electrical connections. Note connector
locations to facilitate re-connection.
3. Loosen the captive screw securing the power supply to the chassis plate
and lift out the power supply.
DC Power Supply Replacement
"Accessing the Service
to calibrate.
to increment the D/A counts
Model 42i Trace Level Instruction Manual
Servicing
▲
to select Manual
(Figure 7–
▲
7-29
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Troubleshooting
