Servicing
Analog Output Testing
7-30
Model 42
i
Trace Level Instruction Manual
Thermo Fisher Scientific
Figure 7–15.
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.
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 output channel (voltage or
current) and compare the meter reading with the output value set on the
Test Analog Outputs screen.
Equipment Required:
Multimeter
Use the following procedure to test the analog outputs.
1.
Connect a meter to the channel to be tested.
Figure 7–16
shows the
analog output pins and
Table 7–4
identifies the associated channels.
Analog Output
Testing
Retaining Screws (4)
BOTTOM VIEW
Captive Screw
Power Supply
