Sanyo RD 203 - Electrical Adjustments; Equipment Required; Tape Speed Adjustment; Head Azimuth Adjustment

ELECTRICAL ADJUSTMENTS
EQUIPMENT
REQUIRED
@®
Test
Tape
for
recording
and
playback
operations
@
VTVM
(2
sets)
*
Metal
Tape
(Example:
TDK
AC-701)
@
Frequency
Counter
@
Alignment
Tool
@ Audio Signal Generator
®
Dummy
Load
(47k-ohm)
:
Prior
to
the
Electrical
Adjustments,
set
the
unit
and
@
Dualtrace
Synchroscope
the
measuring
instruments
as
follows:
_
*
MODE
2
vicwss
ax
ass
eecetr
as
eeee:
ee
CHOP
(chopped)
®
DOLBY
NE
Switen:
<4.
be
ch.p
bara
eae
Mocs
OFF
*
SOURCE:
<4:.4:.
24.
etack
ea
INT
(internal),
CH1
or
CH2
@®
Tape
Select
Switch..............2000
0)
NORMAL
*
SWEEP
MODE
..............
AUTO
(automatic)
@
Input
Select
Switch
............
a
enacted
eh
eas
teas
LINE
| ® Input Level Control .......0.. 0.2.00 0008- Maximum
Sy
eet
tapes
@
Audio
Signal
Generator
Output
.......
1kHz
OdB
(1V)
* 3kHz test tape (Example: TEAC MTT- 111) for Tape
| Speed Adjustment NOTE:
* 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
The electrical adjustments should be performed in the order as
described below.
TAPE SPEED ADJUSTMENT
Connect the frequency counter to the left or right channel LINE OUT.
HEAD AZIMUTH ADJUSTMENT
Wave Forms: Overlapped
Remove
the
cassette
compartment
lid
from
the
unit
and
connect
the
dualtrace
synchroscope,
VTVM:
Max.
Potentiometer inside Motor
and the VTVM to both channel LINE OUT.
Position of Tape Switch
PLAYBACK GAIN ADJUSTMENT
Connect the VTVM to LINE OUT.
Position of Tape Switch
MTT-150
Normal
(DOLBY Level
Calibration Tape)
RECORDING BIAS ADJUSTMENT
Connect
the
audio
signal
generator
and
the
attenuator
to
the
LINE
IN,
and
the
VTVM
to
the
LINE
OUT.
[step
|
_Imput
Signal__|
Test
Tape
__|_Position
of
Tape
Switch
[—Adusivent
|
Revarks
—
RECORDING GAIN ADJUSTMENT
Connect
the
audio
signal
generator
and
the
attenuator
to
the
LINE
IN,
and
the
VTVM
to
the
LINE
OUT.
|
a
Level
a
TDK
AC-701
Metal
P102
(Left)
|
P202
(Right)
Azimuth Adjusting Screw
P101 (Left)
P201 (Right)
Output:
14kHz = 1kHz
Deviation +1dB
P103 (Left)
P203 (Right)
1kHz and 14kHz
at 7.1 mV (—43dB)
1kHz at 178mV
— (—15dB) -
335mvV (—9.5dB)