Broadcast Electronics 3000 Series - Mechanical System; Maintenance; Cleaning; Demagnetizing

5-22. MECHANICAL SYSTEM
A hysteresis, synchronous motor provides direct capstan drive
for the
Series 3000. Normally equipped with a single speed motor, a two
speed motor is installed in models equipped for optional fast forward
cueing.
The motor is attached directly to the underside of the tape deck
with the capstan shaft extending up above the deck surface.
The pressure roller in combination with the capstan shaft
drives tape. Movement of tape is initiated by a de air damped solenoid
connected to the roller shaft with a chain.
The tape head or heads are mounted on a bracket attached to
the top surface of the deck.
All models are equipped with the unique
PHASE LOK III head bracket which permits independent azimuth adjustment
with
full three plane head movement. Three independent tape guides are
mounted to the deck surface adjacent to the head bracket(s). A cartridge
hold down clip mounted above the tape guides applies pressure to the top
of the cartridge at the head openings to prevent cartridge movement.
Side cartridge movement is prevented by an adjustable left hand guide
bracket.
5-23.
5-24.
MAINTENANCE
CLEANING
Once a day the heads, capstan, and pressure roller should be
cleaned.
5-25.
DEMAGNETIZING
At least once every month the heads should be demagnetized
with a
head degausser.
5-26.
CARTRIDGE MAINTENANCE
The cartridge is the second half of the tape cartridge system.
The cartridge needs regular card just like the cartridge recorder or
reproducer.
Check the cartridge before adjusting the machine.
The tape should be inspected regularly and frequently for obvious
signs of wear. Cartridges should
be rewound or replaced when the oxide
side
of the tape is shiny. If possible only one type of tape should be in
use in an installation. Different brands, and even different types of the
same brand, require different bias recording levels for optimum response.
When rewinding cartridges use only a graphite lubricated tape. Silicone
lubricated tapes cannot stand up to the rugged service in a cartridge.
A deformed shell can adversely affect frequency response by
distorting the path the tape travels. In particular, a warped cartridge
may cause the tape to traverse the head openings in an arc or bowed path
rather than·a straight line.
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