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Service Maintenance
______________________________________ Replacing PCBs and Assemblies in the Tower
__________________ LCQ Deca XP Plus Hardware Manual _________________
5-39
To replace a component that is in the tower, proceed as follows:
1. Shut down and vent the system as described in the topic Shutting Down
the System Completely in the System Shutdown, Startup, and Reset
chapter.
2. Remove the top cover of the MS detector as described in the topic
Removing the Top Cover of the MS Detector on page 5-6.
3. Reposition the embedded computer (to expose the tower), as follows:
a.
Disconnect the cables that connect to the top of the embedded
computer.
b. Loosen the six fasteners that secure the embedded computer to the
vacuum manifold, base plate, and chassis.
c.
Lift up the embedded computer a sufficient distance to access the two
cables that connect to the bottom of the embedded computer.
Disconnect the two cables that connect to the bottom of the embedded
computer.
d. Lift the embedded computer and reposition it such that the two hooks
in the back of the embedded computer box insert into the two slots in
the MS detector chassis. See Figure 5-14 on page 5-44 for the
location of the slots.
•
To replace the switching power supply assembly (which includes
the +5 V,
±
15 V, +24 V dc and +36 V, -28 V dc
switching power
supplies), go to step 4.
•
To replace the Turbomolecular Pump Controller, go to step 5.
•
To replace the 8 kV power supply, go to step 6.
4. To replace the switching power supply assembly (which includes the
+5 V,
±
15 V, +24 V dc and +36 V, -28 V dc
switching power supplies),
proceed as follows:
a.
Disconnect the cable to the RF Voltage Amplifier PCB from the
connector on the RF Voltage Amplifier PCB. (See Figure 5-15 on
page 5-47 for the location of the RF Voltage Amplifier PCB,
Analyzer Auxiliary PCB, and Waveform Amplifier PCB.)
b. Disconnect the two cables to the Analyzer Auxiliary PCB from the
two connectors on the Analyzer Auxiliary PCB.
c.
Disconnect the cable to the Waveform Amplifier PCB from the
connector on the Waveform Amplifier PCB.
CAUTION. Make sure that the XP Plus power cord is unplugged before
you proceed.
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