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Servicing
Preamp Board Calibration
Preamp Board
Calibration
Pump Replacement
7-20
Model 48i Trace Level-Enhanced Instruction Manual
Note If Service Mode is not displayed, refer to
Mode" on page 7-3, then return to the beginning of this step.
8. Calibrate the instrument. Refer to the "Calibration" chapter in this
manual.
Calibrate the preamp board after replacing the preamp board.
Equipment Damage This adjustment should only be performed by an
instrument service technician.
1. Let the instrument sample zero air for about 90 minutes.
2. From the Main Menu, press
to scroll to Preamp Board Calibration > and press
The Preamp Board Cal screen appears.
Note If Service Mode is not displayed, refer to
Mode" on page 7-3, then return to the beginning of this step.
3. At the Preamp Board Cal screen, use
Sample or Reference value reads more than 150,000 then press
to save the value.
Use the following procedure to rebuild the pump
Equipment Required:
Pump
Nut driver
Philips screwdriver, #2
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.
"Accessing the Service
▲
to scroll to Service > press
"Accessing the Service
(Figure
▲
▲
>
.
▲
until either the
7–11).
Thermo Fisher Scientific
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Troubleshooting
