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Figure
12—1
BLOCK
DIAGRAM
(2/2)
e Pinch Roller Pressure Check
1) Place the unit in play mode.
2) Push the pinch roller, at the point A) shown in Fig.12—2,
by using a tension gauge (500 gr.) so that it will come off
the capstan. Then, slowly release the tension until the pinch
roller hits the capstan again (i.e., the pinch roller is about
to rotate again). Check, then, the tension gauge is reading
300 gr. to 380 gr.
If the reading is outside the range of 300 gr. to 380 gr.
bend the pinch roller spring or replace.
3
—
capstan
tension gauge
pinch roller
pinch roller spring
Figure 12—2
e
Torque
Check
at
Play,
Fast
Forward
and
Rewind
Modes
Put
a
torque
meter
cassette
in
the
cassette
compartment
of
the
unit,
and
see
that
the
measured
torque
in
each
mode
is
normal
as
follows:
Mode
Torque
meter
cassette
Measured
torque
Playback
TW-—2111
35
~
60gram.cm
Fast
forward
TW-2231
90
~
135
gram.
cm
Rewind
TW-2231
{90
~
136
gram.
cm
MECHANICAL ADJUSTMENT
e
Record/Playback
Head
Azimuth
Adjustment
1)
Make
connection
of
instruments
as
shown
in
Fig.12—3,
2)
Set the
mode
selector
switch
at
“tape”,
the
tape
selector
switch
at
“normal”
and
the
Dolby
NR
switch
at
“off”
position.
3) Put a test tape (TEAC, MTT-114, 10 kHz 250 pWb/m,
—10dB prerecorded) into the unit and play it.
4) Adjust the head azimuth adjusting screw so that the
electronic voltmeter reading is maximal.
Note:
If a dual-trace oscilloscope is available, perform the adjust-
ment so that the reading of the oscilloscope is maximal and
with the least phase/output difference between channels.
After the work, check that the head azimuth adjusting screw
has been secured completely.
record/playback oscilloscope
socket SO301
3 Pin ie
test tape
MTT-114
electronic
voltmeter
record/playback record/playback socket
head $0301 © Pin (R-ch)
Figure 12—3
e Tape Speed Adjustment ‘
1)
Connect
a
wow/flutter
meter,
across
a
100
kohm
resistor,
to
the
line
output
jack.
2) Play a test tape (TEAC, MTT-111, 3kHz prerecorded).
3)
Put
a
plastic
screwdriver
into
the
hole
of
the
motor
and
adjust
the
semi-variable
resistor
so
that
the
output
frequency
is
3000
+
15Hz
on
the
wow/flutter
meter.
—12—