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MK-100
Adjusting Recording Bias
Remove red wire soldered to head.
head and red wire.
terminal of head and red wire.
Set the recorder in the recording mode.
(V.T.V.M) indicated 10+1mA.
the frequency counter indicated 4045kHz.
Connect a resistor of approximately 100Q to terminal of
Connect
the Electronic
Volt
Meter
(V.T.V.M)
to the
Adjust
the
VR2
so
that
the
Electronic
Volt
Meter
After adjustment check that the bias frequency between
R/P Head
i
fe
Frequency Counter
Fig. 22
(4)
Electronic Volt Meter
Cleaning and Lubrication
1. Cleaning
Wipe contamination off the head, capstan, pinch roller and
other parts which come in contact with the tape. Dust on
the head results in poor sound and ineffective erasing. Use a
cloth soaked in alcohol, benzine, trichloroethylene, etc.
Be careful of handling these chemicals as they damage the
cabinet.
2. Lubrication
Feed one or two drops of DTE oil or equivalent machine oil
to the rewind
roller shaft and pinch roller shaft once or
twice an year on a normal use basis. Too much oil results in
unsmooth rotation.
Before Service
Slide control knob does not function.
Is a cassette loaded?
Rec button cannot be pressed.
Is a cassette loaded?
Is the safety tab of the cassette in place?
Slide control knob fails to forward the tape.
Are batteries correctly loaded?
Is battery power sufficient?
Is the tape fully wound to its end?
Is the tape too slack to be wound?
No sound is heard from the speaker.
Is the earphone plugged in?
Is the volume control turned to minimum?
3. Remarks
Be careful not to apply oil to the rubber or rotating parts of
belt, and pinch roller. Wipe off oil with a cloth soaked in
alcohol to remove oil etc.
Sound volume is not sufficient or excessive noise is heard.
Is battery power sufficient?
Is the head clean or free from magnetization?
Is the tape not excessively old?
Wow
and
flutter is increased,
tape slows down
or is en-
tangled.
Is battery power sufficient?
Are the pinch roller, capstan and head clean?
Is the tape in good enough condition?
_—W-—
No. 0002
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