AT&T Bell System Plant Series Adjustment Procedure page 4

SECTION 034-368-701
TABLE A
SCHEDULE OF PREVENTIVE MAINTENANCE
INTERVAL
MAINTENANCE OPERATION
STANDBY TAPE IN
AND IN USE MOTION
General Cleaning
200 hours
Clean Tape Path
8 hours
Clean Tape-Cleaner Cartridge
120 hours
Replace Vacuum Unit Filtert
800 hours
Check Reel Brake Tension
800 hours
Check Reel Brake Liningst 4000 hours
Replace Reel Motor Brushest 5000 hours
Check Vacuum Unit Motor Brushest 800 hours
Replace Vacuum Unit Motort
4000 hourst
Replace Capstan and Reel Tachometerst 30,000 hours
Replace Photosense Head Assemblyt 10,000 hours
Replace Loop Sensor Assembliest
10,000 hours
t Refer to Section 034-368-801 for replacement procedures.
t Vacuum unit motor in use.
as soon as practical to prevent discoloration of
the finish.
Caution: When performing maintenance
operations, exercise care to avoid damage
to the magnetic head assembly. Gently
raise and lower the head cover to prevent
flattening the head cover stop.
(b) Tape Transport: The magnetic head assembly
(Fig. 3), capstan, tachometer pulleys, vacuum
chambers (including glass covers, photocells, and
exciter lamp windows), tape guides, and photosense
head shall be free of dust, film, tape oxide,
and all other foreign material.
(c) Tape Cleaner: Accumulated tape oxide
shall be removed from tape cleaner after
each period of 120 hours of tape running time.
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(d) Transport Access Door: The plastic
transparent window of the transport door
(Fig. 2) shall be free of dust and finger smudges.
(e) Vacuum Unit Filter: The filter element,
located inside the vacuum unit muffler
(Fig. 4), shall be replaced in accordance with
Table A. Ordering information for the filter is
given in Section 034-368-801.
Caution: Failure to replace a dirty filter
element can cause dirt and dust to
contaminate the sound proofing material
in the muffler. This condition restricts
the flow of air, resulting in degradation
of vacuum chamber performance.
2.03
Lubrication
(a) The tape transport and the control unit do
not require lubrication.