Servicing
I/O Expansion Board (Optional) Replacement
Thermo Fisher Scientific
Model 15
i
Instruction Manual
7-35
Note
Since the thermistors are interchangeable to an accuracy of ±0.2 °C,
and have a value of 10 K ohms at 25 °C, an alternate procedure is to
connect an accurately known 10 K resistor to the thermistor input (AMB
TEMP) on the measurement interface board, and enter the temperature
reading.
▲
A 1 °C change corresponds to a ±5% change in resistance, thus this
alternative procedure can be quite accurate as a check; however, it clearly is
not NIST traceable.
▲
3.
From the Main Menu, choose Service >
Temperature Calibration
.
The Calibrate Ambient Temp 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.
▲
4.
Wait at least 10 seconds for the ambient reading to stabilize, use
and
to enter the known temperature, and
press
to save the temperature value.
5.
Install the cover.
Use the following procedure to replace the optional I/O expansion board
(
Figure 7–16
).
Equipment Required:
I/O expansion board
Nut driver, 3/16-inch
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.
Unplug the I/O expansion board cable from the EXPANSION BD
connector on the motherboard.
I/O Expansion Board
(Optional)
Replacement
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