Servicing
Temperature Control Board Replacement
7-38
Model 42
i
Trace Level Instruction Manual
Thermo Fisher Scientific
7.
Press
to return to the Pressure Sensor Cal menu.
8.
At the Pressure Sensor Cal menu, press
to select
Span
.
The Calibrate Pressure Span screen appears.
9.
Wait at least 10 seconds for the ambient reading to stabilize, use
and
to enter the known barometric pressure,
and press
to save the pressure value.
10.
Reconnect the instrument tubing to the pressure transducer.
11.
Install the cover.
Use the following procedure to replace the temperature control board
(
Figure 7–7
).
Equipment Required:
Temperature control board
Small flat-blade 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 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.
Temperature Control
Board Replacement
