Servicing
Analog Output Testing
7-30 Model 42i Low Source Instruction Manual Thermo Electron Corporation
3. Loosen the captive screw securing the power supply to the chassis plate
and lift out the power supply.
Figure 7-16. Replacing the DC Power Supply
4. Turn the power supply upside down and remove the four retaining
screws securing the power supply to the power supply plate and remove
the power supply.
5. To install the DC power supply, follow the previous steps in reverse.
Analog Output Testing The analog outputs should be tested if the concentration value on the front
panel display disagrees with the analog outputs. To check the analog
outputs, you connect a meter to an analog voltage output channel and
compare the meter reading with the output value set on the Test Analog
Outputs screen.
Use the following procedure to test the analog outputs.
1. Connect a meter to the channel to be tested. Figure 7-17 shows the
analog output pins and Table 7-3 identifies the associated channels.
Power Supply
Retaining Screws (4)
BOTTOM VIEW
Captive Screw
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