Service Maintenance
Replacing PCBs and Assemblies in the Tower _____________________________________
5-50
___________________ LCQ Deca XP Plus Hardware Manual ________________
j.
Reconnect the electron multiplier high voltage cable to the electron
multiplier power supply.
k. Reconnect the conversion dynode high voltage cable to the
conversion dynode feedthrough.
l.
Go to step 8.
4. To replace the Analyzer PCB, proceed as follows. See Figure 5-15 on
page 5-47 for the location of the Analyzer PCB.
a.
Disconnect (at P5) the octapoles cable that comes from the Analyzer
Auxiliary PCB.
b. Disconnect (at P4) the lenses cable that comes from the System
Control PCB.
c.
Disconnect (at P2 and P3) the two endcap electrode cables that come
from the Analyzer Auxiliary PCB.
d. Disconnect (at P1) the electrometer cable. (If necessary, use a small
screw driver to loosen the screws that secure the cable.)
e.
Disconnect the electron multiplier high voltage cable that comes from
the electron multiplier power supply.
f.
Use a 7/16-in. open-end wrench to disconnect the helium damping
gas line from the fitting.
g. With a Phillips screwdriver, remove the metal cover from the
Analyzer PCB.
h. With a Phillips screwdriver, remove the screws that hold the Analyzer
PCB to the top cover plate of the vacuum manifold.
i.
Unseat and remove the Analyzer PCB from the top cover plate.
j.
Unpack the new Analyzer PCB (P/N 97033-61051). Retain the
packing materials so that you can pack and ship the defective PCB to
the Thermo Finnigan Repair Center in San Jose. Be sure to note the
apparent problem or symptoms on the enclosed forms.
k. Carefully align and seat the Analyzer PCB into the 8-pin and 4-pin
feedthroughs on the top cover plate.
l.
With a Phillips screwdriver, reinstall the screws that hold the
Analyzer PCB to the top cover plate.
m. With a Phillips screwdriver, reinstall the metal cover.
Caution. To prevent damage to the electronics due to electrostatic
discharge, attach an electrostatic discharge (ESD) strap to your wrist before
continuing.
Summary of Contents for LCQ Deca XP Plus
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