Technics RS-646DS-D

SCHEMATIC DIAGRAM MODEL RS-646DS-D
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NOTE:
1 Sli -Slda Record/playback select switch (shown in playback position), 18. VR7. 8 Record level adjustment VR for NORMAL tape.
2 $21 $24 Input select switch (shown in LINE position) 19. VRQ, 10 -s+-+--Record level adjustment VR for CrO2 tape.
ioe
3
$3.1-$3-4.
-+.-EQ
select
switch
(shown
in
"120s"
position)
20,
VRID
v0
-+-Level
meter
adjustment
VR
for
Rech
MAISOLF
4
$41,542
Limiter
ON/OFF
switch
(shown
in
OFF
position)
21,
VR12
soo-Battery
level
adjustment
VR
i
:
8.
S51
S52
Dofby
IN/OUT
switch
(shown
in
OUT
position)
22.
VRGQ1,
602
----Record
input
level
control
11202
288324
7201
2801383
UM-1x8
6
SE
Battery
check
switch
(shown
in
OFF
position)
23,
VR603.---
Tone
volume
7. 37 Bias Low/HIGH select switch (shown in Low position? 24. VRE04-----0---Speaker volume with speaker ON/OFF switch
TERMINATIONS
(BOTTOM
VIEW)
r
8
os
Mets
light
ich
(shown
in
OFF
position)
25.
Resistor
values
are
in
ohms
(11),
1/4
watt
unless
specified
otherwise
280828
,
2SA584
2801568
,
2801847
288324
ibd
;
ee
Micro:
Rasitots
astises.
2SK30AD
2SA886
t
SM102.F
10
a
Motor
ON/OFF:
Micro-switci
t
Resistors
indicatea
thickly
show
printed
type
resistor,
|
I
e5
LL
SH
-
AC/DC
select
switch
26.
Capacitor
values
are
in
microfarads
(uF)
unless
specified
otherwise
310
|
Tr301
12.
$12
Power
arnplifier
IN/OUT
switen
P=Picofarads
|
fom
do
2SC1568
13.
$13
Piay
switcn,
27.
The
mark
(¥)
shows
test
point.
e.g.
¥=Test
point
|
|
aK
|
14,
$14
1,
$14.2.--Muting
switch
{off
at
REC/PLAY
poston)
28.
All
voltage
vaiues
shown
in
circuitry
are
under
no
signal
condition
with
volume
Lo
be
|
15.
S15
2
voltage
selector
switen
control
at
minimum
position
16. VR1, 2 Playback tevel adjustment VR For measurement, use VIVM
17 VR3. 4.5, 6 ---Doiby NR adjustment VR. 29. For parts which are shaded (sis). only parts specified by the manufacturer
OE
ee
f
should
be
used
for
replacement
sn
critical
circurt
19