Servicing
Internal O2 Sensor (Optional) Replacement
7-36
Model 48
i
Instruction Manual
Thermo Fisher Scientific
Use the following procedure to replace the optional internal O
2
sensor (see
Figure 7–2
).
Equipment Required:
O
2
sensor
Philips screwdriver
Wrench, 7/16-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.
Disconnect the oxygen sensor ribbon cable.
3.
Disconnect all plumbing connections from the oxygen sensor.
4.
Loosen the four captive screws holding the converter to the floor plate
and move it to the front of the case.
5.
Loosen the three captive screws holding the oxygen sensor to the floor
plate and remove the oxygen sensor.
6.
Install new oxygen sensor by following the previous steps in reverse.
Use the following procedure to replace the digital output board (
Figure 7–
15
).
Equipment Required:
Digital output 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.
▲
Internal O
2
Sensor
(Optional)
Replacement
Digital Output Board
Replacement
