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Technics RS-B205

Technics RS-B205
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Dolby
NR
circuit
1.
Test
equipment
connection
is
shown
in
Fig.
10.
2.
Set
a
normal
tape
and
apply
1kHz
signal
in
record
pause
mode.
3.
Adjust
by
attenuator
so
that
the
output
between
terminal
7
of
10401
(L-CH)
{1C402
(R-CH)}
and
ground
is
12.3mV.
—
Dolby
B
(Encode
characteristic)
—
4.
Set
NR
switch
to
“Dolby
B”
and
change
the
input
signal
to
1kHz,
5kHz.
5.
Check
that
the
output
between
terminal
21
of
C401
(L-CH)
{!C402
(R-CH)}
and
ground
change
as
specified
from
the
level
in
NR
out
mode.
Standard
value:
6+
1.5dB
(1kHz),
8+
1.5dB
(5kHz)
—
Dolby
C
(Encode
characteristic)
—
6.
Set
NR
switch
to
“Dolby
C”
and
change
the
input
signal
to
1kHz,
5kHz.
7.
Check
that
the
output
between
terminal
21
of
1C401
(L-CH)
{IC402
(R-CH)}
and
ground
change
as
specified
from
the
level
in
NR
out
mode.
Standard
value:
11.5+1.5dB
(1kHz),
8.5+1.5dB
(5kHz)
@
RESISTORS
AND
CAPACITORS
AF
oscillator.
=
ATT
Notes:
1.
Part
numbers
are
indicated
on
most
mechanical
parts.
3.
The
unit
of
resistance
is
OHM
(Q).
Please
use
this
part
number
for
parts
order.
K=10009,
M=1000kQ
2.
Important
safety
notice.
4.
The
unit
of
capacitance
is
MICROFARAD
(uF).
Components
identified
by
/\
mark
have
special
charac-
P=10%yF.
teristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
manufacturer’s
specified
parts.
Numbering
System
of
Resistor
Numbering
System
of
Capacitor
Capacitor
Type
Tolerance
ERD
—
:
Carbon
ERG
_ :
Metal
Oxide
ERC
:
Solid
:
Non-polar
Electrolytic
: :
50V
DC
:
+0.25pF
:
Electrolytic
:
50V
DC
:
+5%
:
Ceramic
:
6.
:
125V
DC
:
+10%
:
Ceramic
H :
500V
DC
:
+80%,
—20%
:
Polyester
: :
400V
AC
:
+20%
Area
:
Polyester
:
Polyester
:
Liquid
electrolyte
double
layer
capacitor
:
Ceramic
[earn
[penne
[vow]
forme
[penne
[van
%*
[E]
All
European
areas
except
United
Kingdom.
%*
[EK]
United
Kingdom.
%*
[EGA]
F.R.
Germany.
¢
RESISTORS
Ref.
No.
Part
No.
Part
No.
R1,2
ERDS2TJ223
22k
|
R47,
48
ERDS2TJ682
6.8k
|
R
403,
404
ERDS2TU562
5.6k
|
R
701
ERDS2TJ562
5.6k
R3,4
R
49,
50
ERDS2TJ272
2.7k
|
R
405,
406
ERDS2TJ332
3.3k
|
R702
ERDS2TJ472
4.7k
[EGA]
only
ERDS2TJ332
3.3k
|
R51,
52
ERDS2TJ222
2.2k
|
R
407,
408
ERDS2T102
1k
|
R
703,
704
ERDS2TJ363
36k
R5,6
ERDS2TJ222
2.2k
}
R53,
54
ERDS2TJ183
18k
|
R
409,
410
ERDS2TJ333
R
705
ERDS2TJ472
47k
R7,8
ERDS2TJ473
47k
|
R55,
56
ERDS2TJ391
390
R
706,
707
ERDS2TJ154
150k
R11,
12
ERDS2TJ102
1k
|
R57,
58
ERDS2TJ391
390
|
R411,
412
ERDS2TJ823
82k
|
R
708
ERDS2TJ152
1.5k
R17,
18
ERDS2TJ472
4.7K
}
R61,
62
ERDS2TJ102
1k
|
R413,
414
ERDS2TJ182
1.8k
|
R
802
ERDS2TJ473
47k
R
19,
20
ERDS2TJ101
100
|
R
63,
64
ERDS2Ty822
8.2k
|
R415,
416
ERDS2TJ512
5.1k
|
R
803
ERDS2TJ103
10k
R
23,
24
ERDS2TJ101
100
|
R
67,
68
ERDS2TJ390
39
|
R
417,
418
ERDS2TJ683
68k
R
25,
26
ERDS2TJ225
2.2M
|
R69,
70
ERDS2TJ103
10k
|
R419,
420
ERDS2TJ222
2.2k
|
R
804
ERDS2TJ683
68k
R2
ERDS2TJ820
R
81,
82
R
421,
422
ERDS2TJ823
82k
|
R
805,
806
ERDS2TJ103
10k
[EGA]
only
ERDS2TJ102
1k
|
R423,
424
ERDS2TJ331
330
|
R
807
ERDS2TJ223
22k
R
31,
32
ERDS2TJ564
560k
|
R
200
ERDS2TJ271
R
425,
426
ERDS2TJ473
47k}
R811
ERDS2TJ223
22k
R
33,
34
ERDS2TJ123
12k
R
600,601
A
ERDS2TJ102
1k
|
R815,
816
ERDS2TJ103
10k
R
35,
36
ERDS2TJ103
10k
|
R
201
ERDS2TJ680
68
|
R
604,
605
R
818
ERDS2TJ103
10k
R
37,
38
ERDS2TJ102
1k
|
R
202
ERD2FCG270
27
[EK]
only
A
ERQ14LKR56
0.56
|
R
819,
820
ERDS2TJ472
4.7k
R
39,
40
ERDS2TJ103
10k
|
R
300,
304
ERDS2TJ8R2
8.2
R
900
ERDS2TJ392
39k
R41,
42
ERDS2TJ222
2.2k
|
R
302,
303
ERDS2TJ683
68k
|
R
606,
607
R901
ERDS2TJ391
390
R
43,
44
ERDS2TJ153
15k
|
R
304
ERDS2TJ1RO
1
[EK]
only
A
ERQ14LK2R2
2.2
|
R
902
ERDS2TJ273
R
401,
402
ERDS2TJ242
700
ERDS2TJ681
680
[EK]
only
ERD2FCJ4R7
47
¢
CAPACITORS
Part
No.
l
Value
Ref.
No.
Part
No.
|
Value
Ref.
No.
Part
No.
Value
Ref.
No.
Part
No.
Value
ECEA1CU100
10
|
C
25,
26
ECEA1HU010
C
39,
40
ECKD1H122KB
0.0012
|
C
303
ECKD1H332KB
—_—(0.0033
ECKD1H122KB
0.0012
|
C
27,
28
ECQB1H682JZ
0.0068
|
C
41,
42
ECQB1H562JZ
0.0056
}|
C
304
ECEA1CU101
100
ECKDIH681KB
=
680p
|
C
29,
30
ECEA1HU010
C
43,
44
ECEA1HU010
1
|
C305
ECQP1393JZ
0.039
ECEAQJU101
100
|
C
31,
32
ECQB1H222sZ
0.0022
|
C
47,
48
ECEA1CU100
10
|
C
401,
402
ECCD1H820K
82p
ECEA1HU2R2
2.2
|
C
33,
34
ECQB1H822JZ
0.0082
|
C
49,
50
ECKD1H102KB
—-0.001
|
C
403,
404
ECQB1H472JZ
—-0.0047
ECEA1CU100
10
|
C
35,
36
ECEA1HU010
C
300,
301
ECFRIE222KAY
0.0022
|
C
405,
406
ECEA1CU100
10
ECQB1H472JZ
(0.0047
|
C
37,
38
ECKD2H331KB
—
330p
|
C
302
ECFD1H682KD
_0.0068
| C
407,
408
ECQM1H473JZ
—_(0.047

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