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ELECTRICAL ADJUSTMENTS
EQUIPMENT REQUIRED
VTVM (2 sets)
Frequency Counter
Dummy Load (47kQ)
Audio Signal Generator
Attenuator
Dualtrace Synchroscope
DC Constant-voltage Regulator
Test Tapes
*
3kHz Test Tape (Example: TEAC
MTT-111)
for Tape
Speed Adjustment
*
10kHz Test Tape (Example: TEAC
MTT-114)
for Head
Azimuth Adjustment
*
4QOHz Test Tape for Dolby Calibration Level (Example:
TEAC MTT-150) for Playback Sensitivity Adjustment
e
Test Tapes for Recording and Playback Operations
*
Chromium Dioxide Tape (Example: TDK AC-51 2)
*
Metal Tape (Example: TDK AC-711)
e
Alignment Tool
Uniess
especially
specified,
set
the
unit and
measuring instruments as follows:
@
Function Switch
...............
ccc cece cece cece een eeeeneneeees
LINE
@
Dolby NR Switch ........... 0. ccc c cece cece cece cece eeeeeeeeeeee
OFF
e@
Tape Select Switch .............cc
ccc cec cece ec enee ee ees NORMAL
@
Beat Cancel SWitch
.............cc
cece cece ee eeeeeeeeeseeeeeeees
2
@
Volume Control ............cccceceeeeseaceseeeaeeees Minimum (0)
e
Audio Signal Generator output................. 1kHz, OdB (1V)
NOTE:
*
The Electrical Adjustment should
be performed
in the
order as described below.
Supply 12V DC from the constant-voltage regulator to the
Ext. Power Jack.
TAPE SPEED ADJUSTMENT
1. Remove
the Radio Chassis
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
Dummy Load 47kQ.
LINE OUT
2. Adjust the tape speed by slowly turning the potentiometer
inside the Motor until the frequency counter reads 3,000Hz
(+30Hz).
Potentiometer for Tape Speed Adjustment
HEAD AZIMUTH ADJUSTMENT
1.
Connect
a dualtrace
synchroscope
and a VTVM
to both
channel LINE OUT as illustrated.
Then, set the dualtrace synchroscope as follows:
a!
| © D | <a
ene
CHOP (chopped)
*
SOURGE.
2.2.25 5ccc.cciacsctcswes
INT (internal), CH1 or CH2
*
SWEEP MODE................. suai deacce AUTO (automatic)
NOTE:
Adjust the field on the synchroscope with the VOLT. ADJ.
and TIME ADJ.
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