Maintenance
INTERNAL
CLEANING
spray or run the water so that the surface is thoroughly
covered to remove all ionized material.
3.
Thoroughly
dry
all PCAs using one of the following
methods:
a. Preferably, the PCA should be dried
in
a low-
temperature drying chamber or infrared drying
rack with
a
temperature range of
49°C
to
72°C
(120°F
to
160°F').
b.
If
neither a clrying chamber nor
a
drying rack is
available, air
dry
the PCA at ambient room tem-
perature for at least two days.
A
satisfactory cleaning method consists of holding the
PCAs
under hot running water until they
are
clean. Follow
this wash with
a
final rinse.
(See
consideration
2,
above.)
6-78.
Cleaning After Soldering
CAUTION
T.M.C.
Cleaner and similar products; can
can
attack
the
nylon
latches and other
plastic pieces.
If
a
PCA has
been
soldered, it should first
be
cleaned with
SPRAYON
T.M.C Cleaner" (rosin
flux
remover) or
equivalent.
The
PCA should then be cleaned with water
as
described above.
SEEN ON
I
EEE-4188
NOTE:.
THESE WAVEFORMS SEEN IN IN-GUARD
TROUBLESHOOTING MODE.
REPETITION
RATE
=
500
G.
INTERRUPTIONS
EVERY
1.5
SEC.
Figure
6-21.
Guard Crossing
Test
Waveforms
Trademark
of
E.E.
DuPont
De
Nemourj
&
Co.
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