Servicing
Temperature Control Board Replacement
Thermo Electron Corporation Model 42i Low Source Instruction Manual 7-37
Temperature Control
Board Replacement
Use the following procedure to replace the temperature control board
(Figure 7-8).
Equipment Required:
Temperature control board
Small flat-blade screwdriver
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Disconnect all connectors from the temperature control board. Use a
small flat-blade screwdriver to loosen the two screws securing the
CONV TC cable. Note that the red wire is towards the rear and the
yellow wire is towards the front.
3. Snap off the board from the board mounts.
4. To install the temperature control board, follow previous steps in
reverse.
Ambient Temperature
Calibration
Use the following procedure to calibrate the ambient internal temperature
for the instrument.
Equipment Required:
Calibrated thermometer or 10K ±1% Resistor
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.
WARNING The service procedures in this manual are restricted to qualified
service representatives.
If the equipment is operated in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
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