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COMPUTER CASSETTE UNIT
OPERATING INSTRUCTIONS
SYMBOL OF QUALITY & RELIABILITY
MODEL NO: PM-C16
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OPERATING INSTRUCTIO N S FOR YOUR
CASSETTE DATA UNIT
Model PM-C16 cassette unit was designed for use on Commodore VIC 20,
64, C16, 116 and 264 computers.
This cassette unit is a device for storing and/or recalling computer programs
on ordinary cassette tapes. It can be used for saving programs you have
written and want to recall for later use. It can also be used to read pre
recorded programs that you have purchased.
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CASSETTE OPERATING INSTRUCTIO N S
FOR YOUR COMPUTER
Important information about your cassette unit
Your cassette unit is supplied with a cord attached. This cord connects the
cassette unit to the VIC computer. Power is supplied from the computer
to the cassette unit through this cord. The computer and cassette
communicate through the cord.
TURN OFF THE COMPUTER BEFORE CONNECTING THE
CASSETTE UNIT TO IT.
Plug the attached cord in to a connector at the back of the VIC computer
The plug will only fit on the specific connector one way. Please DO NOT
FORCE IT TO PREVENT DAMAGE.
It is important to keep the cassette unit at least 2 feet away from the TV
as radio emissions from the TV can interfere with the correct operation of
the cassette unit.
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PRELIM INARY CHECKOUT
Before using your cassette drive unit to recall or store programs, you
should complete the preliminary checks—which are described below:
1. Turn off the computer and connect the cassette unit through the
cord to the computer.
2. Ensure that the cassette deck motor is off by checking that all of
the function keys are up. If any are not, press the STOP button.
3. Turn the computer on.
Fig. 1
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4. Press the PLAY button on the cassette unit Look to see that, as
the button is engaged, the READ/WRITE heads move towards the
spindles and the capstan comes into contact with the pinch roller
(see Fig. 1). The take-up spindle should be moving smoothly in an
anti-clockwise direction
5. Now press the STOP button. The heads should move back and the
spindle stop.
6. Press the REWIND button. The tape heads should remain in the
inactive position and the supply spindle should move rapidly
clockwise.
7. Press STOP again and then F. FWD. The tape heads should still
remain in the inactive position and the take-up spindle should move
rapidly anticlockwise.
8. Press STOP once more and then GENTLY attempt to press REC.
You should feel strong mechanical resistance.
9. If all has worked, your cassette has been properly checked and is
ready go to work
CARE OF TAPES
Be careful to rewind all tapes to the beginning after use as this protects
the recording from abrasion and contamination. Do not store or place any
tapes near strong magnetic fields such as may occur'near loudspeakers
or large motors.
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CASSETTE M A INTENANC E
The cassette uses magnetic heads to record and retrieve the infor
mation on the cassette tapes. These heads tend to accumulate residue and
diret from the tape as the tape moves accross them. After a period of time
the acumulation lifts the tape slightly away from the neads drastically
degrading the signal from the head.
Therefore, the following procedure should be used after every 10 to
20 hours of tape playing time to ensure that your cassette continues to read
and write reliably.
CLEAN ING AND D EM AGNETIZING YOUR
CASSETTE HEADS
You’ll need the following tools and materials:
Tape head cleaner. Alcohol may be used in emergency, but is not
recommended for long term use.
NOTE: Do not use trichloroethane or any other plastic or rubber solvent.
Cotton swabs.
Tape head demagnetizer. Unit must have protective plastic or rubber
covering on the piece that comes into contact with the tape heads so as
not to scratch delicate head gap.
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FOLLOW THIS PROCEDURE
1. Turn the computer off.
2. Press EJECT- to open cover, then press PLAY to expose heads.
3. Put tape head cleaner on one side of a cotton swab. Gently wipe
the surfaces of RECORD/PLAY and erase head (see Fig. 1).
Scrub gently. (If there is any build-up of tape oxide particles on or
around the head gap of the RECORD/PLAY head, it is sufficient
reason for unreliable performance.)
’ Also clean pinch roller and other tape bearing surfaces jf tape head
cleaner is suitable for this purpose (check label).
4. Plug in demagnetizes and activate it whileit is at least one foot away
from cassette heads.
5. Slowly move demagnetized up to RECORD/PLAY head and around
on head surface. Rate of motion should be approximately one inch
per second during this time.
6. Slowly move demagnetizer to erase head and then to all other
ferrous metal surfaces which come into proximity with the tape.
7. Now slowly move demagnetizer away from heads. Do not deactivate
field until demagnetizer is at least two feel away from heads.
The tape head cleaning and demagnetizing procedure is now complete.
Inspect RECORD/PLAY, surface for wear. If the tape has worn a groove on
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head surface more than a couple of tape thicknesses deep, program reading
performance .may be poor. If so, then replacement of tape head is indicated.
(Normally few thousand hours of tape running time have been completed
before replacement is required.)
CASSETTE DECK PROBLEMS
If you are experiencing problems with your cassette deck either
mechanically or electronically, return it to the dealer from whom it was
purchased. If the cassette deck is faulty and in warranty he will replace i
for you.
PRINTED IN TAIWAN
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