Sanyo RD250 - Parts Location

ADJUSTMENT OF AMPLIFIER UNIT
* Adjust as follows after cleaning the head and adjusting its
azimuth properly.
*Set the input switch at the LINE side.
TEST OSCILLATOR
{OSCILLATOR & ATTEMUATOR)
OSCILLOSCOPE
(1)
(2)
(3)
LINE IN LINE OUT
Adjustment of playback output
DOLBY NR switch: OFF
Tape selector: NORMAL
Test tape: MTT-150 (Dolby tape)
Play back test tape, and turn SVR701 (L-ch), SVR801
(R-ch) until the playback output becomes 0.55 V.
Adjustment of level meter
DOLBY NR switch: OFF
Tape selector: NORMAL
Test tape: MTT-150 (Dolby tape)
Play back test tape, and turn SVR703 (L-ch), SVR803
(R-ch) until the +3 dB LED on level meter begins to
light up.
Adjustment of record, playback output
DOLBY NR switch: OFF
Tape selector: METAL
Input signal: —20 dB, 1 kHz
Tape: Metal tape (AC-711 or the like)
. Feed input signal to record input terminal, and pause
the set in record mode.
.
Turn
the
input
level
adjusting
knob
until
the
record
monitor output becomes 0.4 V.
. Record this input signal.
.
Press
the
rewind
button
the
rewind
the
tape
to
the
record starting position.
. Press the play button.
. Make sure the playback output is 0.4 V.
. If other than 0.4 V, turn SVR702 (L-ch), SVR802
(R-ch) to adjust.
. Repeat steps 3. to 7. to adjust the playback output to
0.4 V precisely.
PARTS LOCATION
SVR803
SVR 703
) METER GAIN
S a
SVR701
Svnaot) PLAY GAIN
SVR601(METAL)
SVR602(METAL)
rt
) BIAS
Syn 702 Rec GAIN
SVR802
(4)
Adjustment
and
checking
of
record,
playback
frequen-
cy
characteristics
(4.1)
Adjustment
with
normal
tape
DOLBY
NR
switch:
OFF
Tape
selector:
NORMAL
Input
signal:
—40
dB
(1
KHz,
10
kHz)
Tape:
Normal
tape
(AC-212
or
the
like)
1. Set the input level adjusting knob in the position
determined in adjustment (3) above.
2. Attenuate the input signal from —20 dB in (3) by
further 20 dB to a final —40 dB.
3.
Change
the
frequency
of
audio
frequency
signal
generator
from
1
kHz
to
10
kHz,
and
record
the
signals.
(Change
as
follows:
1,
10,
1,
10
kHz.)
4. Press the rewind button to rewind the tape to the
record starting position.
5. Press the play button.
6. Regarding the playback output of 1 kHz signal as 0
dB, make sure the value of 10 kHz signal is within a
range of +1 dB.
7. If out of this range, turn SVR6O1 (L-ch), SVR602
(R-ch) to adjust.
8. Repeat steps 3. to 7.