Preve Ntive Iviaintenance; General; Cleaning; Lubri Ation - Scully 280B Series Instruction And Maintenance Manual

Model 280B
Preventive Maintenance
SECTION 4
PREVENTIVE MAINTENANCE
4.1
GENERAL
Preventive maintenance of the electronics assembly
consists of cleaning and visual inspection of com­
ponents and wiring. Remove the covers at frequent
intervals and remove any accumulations of dirt,
dust, and foreign objects. Inspect for loose connec­
tors, broken contacts, frayed or broken wiring,
overheated components, or other visible signs of
trouble. Check that printed wiring assemblies are
firmly seated in their connectors.
4.2 CLEANING
Clean all components in the tape path after each
reel change.
A. Remove all tape from the tape path.
B. Moisten a "Q" tip applicator with isopropyl
alcohol. Squeeze excess solvent from the tip
between two layers of clean cloth.
C. Scrub all components in the tape path, with
exception of the pressure roller, commenc ­
ing with the heads, using moderate pressure
un til all oxide particles are removed.
Do not use too much head cleaner,
and never use a metallic instrument
as a cleaning tool. Excess solvent
dripping into critical parts or minor
scratches on components in the
tape path may seriously degrade the
performance of the equipment. Do
not use a blower of any type be ­
cause dirt and dust particles may be
forced into rotating parts.
D. Use a rubber band to hold the tape break arm
and manually move the reels. Moisten a "Q"
tip with isopropyl alcohol and squeeze out
excess fluid. Contact the pressure roller with
the "Q" tip and sweep the tip up and down
the surface un til all oxide is removed from
the pressure roller. Change the applicator as
soon as it becomes fouled.
E. Check all parts in the tape path for loose cot ­
ton fibers and unevaporated solvent. Remove
and dry as necessary.
F. Inspect all components at the back of the
transport once a month. Remove any accumu­
lation of dirt or dust with a soft brush or vac ­
uum cleaner.
4.3 LUBRICATION
No lubrication is required in the transport under
regular maintanance conditions.
4.4 DEMAGNETIZING
The entire process of professional tape recording
and reproducing relies on the use of alternating
magnetic fields, but permanent dc fields are detri ­
mental in many ways to high performance equip­
ment. Such permanent magnetic fields cause am ­
plitude and frequency distortion, as well as higher
noise level and gradual degradation of recorded
information. Therefore, good practice requires
that the heads be demagnetized every month, or
sooner if symptoms appear to indicate the need.
Any standard demagnetizer with padded tips can
be used, but extreme care should be given to actual
technique:
4-1