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RE
e
ELECTRICAL ADJUSTMENTS
QUIRED
EQUIPMENTS
VTVM
(2 Sets)
Frequency Counter
Audio Signal Generator
Attenuator
Dummy
Load (47k-ohm)
Dualtrace Synchroscope
Test Tapes
*
3kHz
test tape
(Example:
TEAC
MTT-111)
for Tape
Speed Adjustment
*
10kHz
test tape (Example: TEAC
MTT-114)
for Head
Azimuth Adjustment
* Test Tape for Dolby Level Calibration (Example: TEAC
MTT-150 in Playback Gain Adjustment
Test Tapes for recording and playback operations
*
Normal Tape (Example: TDK AC-220)
*
Ferrichromium Tape (Example: SONY DUAD C-60)
* Chromium Dioxide Tape (Example: TDK AC-511)
Alignment Too!
Prior to the Electrical Adjustments, set the unit and
the measuring instruments as follows:
TA
I:
2:
Bias Switch,
....2s sic. % oS Pee
acs gon vk
6
NORM
EQ Switch:
&. 2 icecGr2 Dche
OS
eH ee dle
he
ee
NORM
Input Select Switch
........
0... 00. c eee eee
LINE
Dolby NR Switch
.. 1...
0... 0.0002
ee eee
OFF
Record Mute Switch. .......
0.000 cee eee eee OFF
Input LevelControl
.............-.2050-
Maximum
Audio Signal Generator output........
1kHz0dB,1V
NOTE:
The
Electrical
Adjustments
should
be preformed
in the
order as below.
PE SPEED ADJUSTMENT
Remove
the Cover from the unit and connect a frequency
counter to the left or right channel LINE OUT as illustrated.
Then, insert
a 3kHz
test tape (Example: TEAC MTT-111)
into the cassette compartment.
Frequency Counter
3kHz (41%)
LINE
OUT
PLAYBACK
47k-ohm
Dummy Load
HEAD AZIMUTH ADJUSTMENT
1,
Remove the cassette compartment lid from the Unit and
connect
a dualtrace
synchroscope
and two VTVM
to the
both
channel
LINE
OUT
as
illustrated.
Then,
set the
synchroscope as follows:
*
MODE
*
SOURCE
*
SWEEP MODE
dirt d Mate ctel Be etd
88 og SMe lB CHOP (chopped)
INT {internal}, CH1 or CH2
AUTO (automatic)
NOTE:
Adjust the field on the synchroscope with the VOLT. ADJ.
and TIME ADJ.
Dualtrace Synchroscope
VTVM (Max.)
LINE
OUT
PLAYBACK
2.
Insert
a 10kHz
test tape (Example:
TEAC MTT-114}
into
the cassette compartment
and check
to see that the phase
difference
of
the
Right
and
Left
channels
on
the
synchroscope while the test tape is being played back.
3. Then, turn the azimuth adjusting screw until the wave forms
of the Right and Left channels are superimposed and set to
optimum at maximum reading of the VT VM.
Adjustment
Sie
R/P Head
Adjustment Screw
S
While
the
test
tape
is being
played
back,
adjust
the
potentiometer
inside
the
Motor
by turning
it until
the
4.
frequency counter reads 3 kHz (+1%).
After the adjustment,
secure
the azimuth
adjusting screw
with paint or glue.
any ae
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