Figure 7-14. Replacing The Dc Power Supply - Thermo Scientific 42i Instruction Manual

Servicing
Analog Output Testing
Analog Output
7-26 Model 42i Instruction Manual
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly ground 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.
Figure 7–14. 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
Testing
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.
Power Supply
Captive Screw
▲
Retaining Screws (4)
BOTTOM VIEW
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