Servicing
Preamp Board Calibration
7-20
Model 15
i
Instruction Manual
Thermo Fisher Scientific
Calibrate the preamp board after replacing the preamp board.
Note
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, choose Service >
Preamp Board Calibration.
The Preamp Board Cal screen appears.
Note
If Service Mode is not displayed, refer to “
Accessing the Service
Mode
” on page
7-4
, then return to the beginning of this step.
▲
3.
At the Preamp Board Cal screen, use
until either the
Sample or Reference value reads more than 150,000 then press
to save the value.
Use the following procedure to rebuild the
Figure 7–10
.
Equipment Required:
Pump
Nut driver
Philips screwdriver, #2
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 the instrument OFF, unplug the power cord, and remove the
cover.
2.
Disconnect the pump power cable from the AC PUMP connector on
the measurement interface board.
3.
Remove both lines from the pump.
Preamp Board
Calibration
Pump Replacement