PS Magazine - TB 43-PS-557
PS, The Preventative Maintenance Monthly
ISSUE 557
APRIL 1999
Fox NBC Vehicle . . .
problems
can be
hard
to track down
with a system as
complex
as the
fox
, but you can
outfox
them with a
little
preventive
maintenance
.
it's
scary
out here
without
pm
!
MM1
PS 557
41
PS 557
40
APR 99
Step on seat—not connector
“Run it” is the best advice for the
MM1 mobile mass spectrometer. It
should be run at least four hours every
week. Without that weekly run, the
MM1 will probably produce faults dur-
ing its self-test.
After starting the MM1, check that
its temperatures have stabilized before
switching from STANDBY to ON. It
usually takes 15 to 20 minutes. If you
switch to ON before that, you risk a
vacuum failure.
damage at the connector. The connec-
tor is often used for a step in and out
of the hatch. Also look for corrosion
inside the connector. Clean out any you
find with a toothbrush.
Prevent damage to the connector by
using the seat next to the battery box—
not the connector—as a step.
Before going to the field, eyeball
the cable to the MM1 battery box for
Check for corrosion
Cable damaged?
A vacuum failure means a call for
your repairman, but in the field he may
not be around. Sometimes a vacuum
failure can be cured by turning off the
MM1 power switch and waiting 15
minutes before switching it back on.
This often brings the MM1 voltage
back to the correct level. Try this fix
no more than five times. After that,
the MM1 will have to wait for your
repairman.
Vacuum failure? Turn
off MM1 for 15 minutes
Wait until
temperature
stabilizes
before
switching
to ON
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