PS Magazine - TB 43-PS-632
PS, The Preventative Maintenance Monthly
ISSUE 632
JULY 2005
T
here’s an important new maintenance procedure required for Stryker mechanics.
When followed correctly, it allows you to use the RS485 PCMCIA card to conduct
intrusive diagnostics of the chassis electronic systems through the maintenance sup-
port device (MSD).
National Instrument software version 1.5 for the RS485 PCMCIA card locks up
the MSD. That was fixed with version 1.6. Unfortunately, loading version 1.6
changes the hardware configuration (com ports) on the MSD from the required 2-
wire setting to 4-wire.
PS 632
JUL 05
3
M1-Series Tanks…
S
taying cool is the key to preventing thermal receiving unit (TRU) failure on your
M1-series tank. To do that, you have to make sure the dewar/cryogenic cooler
assembly doesn’t lose helium pressure.
Help your TRU keep its cool with these PM tips:
PS 632
JUL 05
2
Stryker…
Change Com Port Settings Manually
1.
Right click on My Computer.
2.
Select Manage.
3.
Click on Device Manager.
4.
Double-click Ports (Com & LPT).
5.
Double-click NI PCMCIA-485 port 1
(com 5). Depending on the card it
may have a -2 after the 485.
6.
Click on the Port Settings tab at
the top of the window.
7.
Click on the Advanced button. The
Transceiver Mode should be 2 Wire
TxRdy Auto. If it’s not, click on the
drop down menu and change it.
8.
Repeat steps 5-7 for NI PCMCIA-
485 port 2 (com 6).
Check out TACOM
Maintenance
Advisory Message
05-013 for
more
details.
To change
the MSD com
ports back to
the
correct
settings,
follow these
steps…
ok!
version
1.6 is now
loaded!
yeah, but
now
you’ve
gotta
reset my
com ports!
mishandling
my thermal
receiver unit
is definiitely
not
cool!
Mechanics
•
Keep your hands off the cooler
assembly when removing or installing
the TRU. Use it as a handhold and the
seals will pull loose. Then the entire
assembly has to be replaced.
•
Use the TRU’s reusable container
whenever storing or shipping the unit.
That protects the cooler assembly from
knocks and bangs that damage seals.
Crewmen
•
Keep the TRU turned off during day-
light hours and at night when it’s not in
use. Unnecessary use increases the
chance of a failure.
•
Pay attention to how long it takes the
TRU to cool down. If it consistently
takes longer than 15 minutes, the cooler
assembly is probably low on helium.
Report it.
TRU not in use?
Put THERMAL
MODE switch
on OFF
Cooler assembly is
not
a handhold!
Cool It with
PM
632.02-03(C!)
5/27/05
9:25 AM
Page 1
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