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Instruction 24-94486-2
Maintenance
6.1 PCA 2 Disassembly
The following procedure describes how to disassemble the analyzer, while
Figures 6-1 thru 6-4 illustrate how the analyzer is put together.
Tools Required:
Medium Phillips Screwdriver
Procedure:
1. Unplug all thermocouples from
bottom of analyzer.
2. Remove battery cover and then
remove batteries.
TIP: In Step 3, if the sensors are
not being replaced, leave the tubing
connected to each sensor’s gas cap,
being careful not to put unneces-
sary strain on the tubing during the
disassembly process.
3. Pull off sensor retainer; and
then unplug all sensors.
4. Lay analyzer face down on a padded work surface; and then using a
medium Phillips screwdriver, remove the unit’s four rear-case screws.
5. Lift rear case from analyzer and set aside.
6. Unplug electrical connectors J8, J9, and J14 from printed circuit
board.
CAUTION: In Step 7, note that there is tubing connected
between the bottom hose-connector plate and the pressure sensor
on the printed circuit board. Do not put unnecessary strain on
this tubing during the disassembly process.
7. Carefully lift battery-and-pump chassis, along with the bottom hose-
connector plate, from analyzer.
8. Lift printed circuit board from analyzer.
•
Rear Case Screws
(typical 4 places)
Release and then
remove battery
cover by pushing
latch up
Figure 6-1. Removing Rear Case