AT&T Bell System Plant Series Adjustment Procedure page 10

SECTION 034-368-701
CODE OR
SPEC NO. DESCRIPTION
TEST APPARATUS
KS-14510 Ll Volt-Ohm-Milliammeter
MATERIALS
KS-2423
KS-6232
Electronic Stroboscope, Type
1531A, 105 to 125 Volts, 50 to
60 Hz, General Radio Co., West
Concord, Mass. (or equivalent)
Patching Cords with Tip Plugs
(to be provided locally for con-
necting test points)
Reel of Magnetic Tape with BOT
and EOT Markers
Nylon Cord (approximately 5
feet)
Cloth
Oil
Freon (TF Grade) S-180, 16 oz.
Aerosol Can, Miller Stephenson
Chemical Co.
3.02
Cleaning
(a) General Cleaning: Use a vacuum cleaner
equipped with a small flexible rubber nozzle,
such as the KS-14377 L30 nozzle, to remove
any loose dust from the inside of the recorder
access door, on the tape transport face, and from
the surrounding equipment frame members.
Remove any remaining residue by wiping with
a clean KS-2423 cloth moistened with Freon (TF
grade). Follow by wiping with a clean, dry
KS-2423 cloth.
(b) Tape Transport
Caution: Use Freon (TF grade) to clean
heads, guides, capstan, vacuum chambers,
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and tachometer rollers. Do not use other
solvents. Freon shall not be applied directly
on the parts. Use a Freon-moistened cloth
to
wipe the parts clean.
(1) Exercising care to avoid damage to the
head assembly, use a clean KS-2423 cloth
moistened with Freon (TF grade) to wipe off
all oxide and dust accumulated on magnetic
head assembly (Fig. 3), head cover assembly,
and outer surface of tape cleaner.
(2) Carefully place a clean KS-2423 cloth
moistened with Freon (TF grade) against
the capstan, and rotate capstan gently by
hand until all oxide and dirt are removed.
(3) Remove glass covers (held in place by
spring clips) from vacuum chambers. If
the covers are excessively dirty, use a KS-2423
cloth moistened with mild soap and water.
Follow this by wiping with a KS-2423 cloth
moistened with Freon (TF grade). Clean the
inside of vacuum chambers and remove oxide
and dust from loop sensors (Fig. 2) and exciter
lamp windows. Replace vacuum chamber
glass covers. Place a clean, dry KS-2423
cloth against the vacuum chamber tape guides
(Fig. 3) and slowly rotate guides to remove
oxide.
(4) Carefully clean the surface of photosense
head using a dry KS-2423 cloth or a cloth
which is slightly moistened with Freon.
(c) Tape Cieaner: Use the 3/32-inch Allen
wrench to remove the tape-cleaner cartridge
retaining screw. Do not disturb the magnetic
head assembly or the tape cleaner bracket.
Remove the cartridge and gently tap the cartridge
body to remove accumulated tape oxide. Reinstall
the cartridge and retaining screw after ensuring