Technics RS-M04 Service Manual

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SCHEMATIC DIAGRAM
15 10mK
R107 6.8K
Q19(Q.20) Q23(Q24) Q27(Q28)
2SC945 2SD592NC 2S8C2021
LINE AMP MUTING HEADPHONES AMP
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PLAYBACK £0 PLAYBACK EQ SELECT DOLBY NR REC MUTE RECORD AMP RECORD EQ SELECT 2SC945 2SA786 2SC945 = 2SA786 METER DRIVE METER MUTE ‘METER ORIVE EQUIVALENT CIRCUIT
MUTING CUE/REVIEW HEADPHONES © HEADPHONES AMP
MUTE AMP
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SPECIFICATIONS
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Input
level
controls
+++:
MAX
|
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Ls
4
S52}
Pilot
LAMP
*
Output
level
control
------
MAX
(a) for mechanism
section
as
P
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re
than
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BIAS
OSC
REGULATOR
BIAS
EQ
SELECT
LED
DRIVE
Plaveack'eo
EC
MUTE
REGULATOR
TING
ane
ise
Sut
MUSIC
Ran
Ree
OnE
roar
Test
tape--
-QZZCFM
(without
NAB
filter)
Overall
distortion
Less than
39%
Test
tape
(Normal)
-QZZCRA
for
Normal
NOTES:
f
-
carmen
i
oe
r
CrO2
TERMINATIONS
(SIDE
VIEW)
©S1-1~S1-14
-
Record/playback
select
switch
(shown
in
playback
position).
#VR201,
202
Bias
current
adjustment
VR.
QZZCRX
ie)
L than
3.5
%
©
$2-1~S2-3
jolby
NR
IN/OUT
select
switch
(shown
in
OUT
position).
©
VR203
-
frase
current
adjustment
VR
(for
metal
position).
ess
[nan
3.
(a)
°S3-
‘ape
select
manual/auto
select
switch
(shown
in
auto
position).
¢
VR301
“FL
meter
adjustment
VR
(for
—
204B
indication).
es
-QZZCRY
for
Fe-Cr
(FeC
CrO2,
Met
!)
Ql
~26
Q40
44
Q27~31
esa:
ec
mute
ON/OFF
switch
(shown
in
OFF
position).
©
VR302
“FL
meter
adjustment
VR
(for
OdB
indication).
QZZCRZ
for
Metal
r,
GrOQ2,
Meta
Q34
39
,
41
42
©
S5-1,
$5-2
Music
selector
ON/OFF
switch
(shown
in
OFF
position).
#15,
L6-
ane
sduustenent
ol
i
oie
or
Metal
oo
esé
ower
ON/OFF
switch
(shown
in
ON
position).
@
Resistance
are
in
ohms
(0),
watt
unless
specified
otherwise.
Q
i
$7,
S8
utomatic
tape
select
switch
(shown
in
Metal
position).
K=1,0000.
:
Overall
S/N
ratio
More
than
45
dB
Q43,45,46
/
7, ry
7
\
eso:
layback
muting
switch
(shown
in
OFF
position).
.
Gapecly
are
microfarads
(uF)
unless
specified
otherwise.
;
eSl0-
‘ast
wind
muting
switch
(shown
in
OFF
position).
P=Pico-farads.
ade
“
Q301
~304
°Si
C
power
Valtege
select
switch.
The
mark
(¥)
shows
test
point.
e.g.
V=test
point
1.
;
Test
tape
QZZCRX
(without
NAB
filter)
eVvRi,
2
layback
gain
adjustment
VR.
©
All
voltage
values
shown
in
circuitry
are
under
no
signal
condition
and
record
mode
with
Input level control. volume control at minimum position.
ecording gain adjustment VR. For measurement, use VTVM.
+: Output level control. ® Ajindicates that only parts specified by the manufacturer used for safety.
13 ECB ECB BC E <vR5, 6

Technics RS-M04 Specifications

General

Brand	Technics
Model	RS-M04
Category	Cassette Player
Language	English