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Mechanical adjustments
RECORD/FAST FORWARDjREWIND torque measure-
ments
1.
Set the torque measuring instrument on the cassette
tape recorder.
2.
Torque
value
under each mode must be
as
follows:
Position
Torque measuring
Value
cassette
PLAYBACK
TW-2111
30
'"
70gram·cm
FAST
TW-2231
60
'"
160gram·cm
FORWARD
REWIND
TW-2231
60
'"
160gram·cm
Record/playback head azimuth adjustment
1.
Set the instrument
as
shown in Fig. 4-2.
2.
Playback the test tape (Teac's
MTTlll,
recorded with
3KHz signals).
3.
Adjust the head azimuth adjusting screw
so
that the
reading on the digital voltmeter
is
at its maximum
value.
Cleaning
of
head
The
head
is
critical for a proper performance
of
the tape
recorder. Dust on the head, capstan, pinch roller, etc.
impedes proper recording and playback. Open the cassette
holder, take out the tape, push down the
PLAYBACK
pushbutton, then clean those components.
If
you can
see
any oxide deposit, clean them using a cotton bud
damped with alcohol.
RECORD
pushbutton can not be pushed in
The
RECORD pushbutton can not be pushed in,
if
the
erasure protect tab
of
the cassette tape
is
broken. Forcible
depression
of
the button may result in machine failure.
17
Tape speed adjustment
1.
Connect the wow-flutter measuring instrument to
:f#!,
pin
of
the
CNW3001
connector.
2. Playback the test tape (UKOG-0119CSZZ, MTT-1l3
recorded with 8KHz signals).
Use
the middle part
of
the
tape for the test.
3. Adjust the
semi-fix~
resistor located on the Motor
Board
so
that the playback frequency should become
8000 ± 250Hz.
Test tape,
MTT-113
Pinch
roller
Collector
of
transistor
03003
Digital
voltmeter
Figure 4-2.
Head