Technics RS-B105

1
2 3
4
5
Hi MAIN CIRCUIT SECTION
@ ELECTRICAL PARTS LIST @ SCHEMATIC DIAGRAM
Notes: 1. Part numbers are indicated on most mechanical parts. Notes:
Please
use
this
part
number
for
parts
order.
(This
schematic
diagram
may
be
modified
at
any
time
with
the
develop-
L
O
C)
ary
Sie
St-1
51-3
—[=>>-
2.
Important
safety
notice:
ment
of
new
technolgy.)
LINE
IN
a)
line
<>
mic
line
+>
mic
line
«+
mic
line
+>
mic
ey
Components
identified
by
/\
mark
have
special
charac-
*
This
is
the
basic
circuit
diagram
of
this
unit.
Y©
@®
O
©
@
OHH
teristics
important
for
safety.
Note
that
part
of
the
circuit
is
subject
to
change
depending
on
the
A
=
1;
or
When
replacing
any
of
these
components,
use
only
manufac-
areas.
|
pe
turer’s
specified
parts.
¢
$1-1~S1-4
:
Line/mic
select
switch
in
“line”
position,
=
si
tk
ee
3.
Bracketed
indications
in
Ref.
No.
columns
specify
the
area.
©
$200,
S201
:
Tape
select
switch
in
“Normal”
position.
ESA
ONLY)
d
Parts
without
these
indications
can
be
used
for
all
areas.
(S200
=:
Metal,
S201
=:
CrO,,
$200,
$201
:
Normal)
1
DIN
eB
¢
$600
:
Power
switch
in
“on”
position.
|
——————
Area
¢
$800
:
Dolby
NR
in/out
select
switch
in
“out”
position.
!
Qn)
¢
$900
:
Motor
switch
in
“off”
position.
DDO
Ic1
in
“age
A
(2)
AN7014K
..All
European
areas
except
United
Kingdom.
°
$901
:
Play
switch
in
“off
position.
l
+
R
United
Kingdom.
°
$902
:
Mute
switch
in
“off”
position.
Poe
LL
a
PT]
LL
3k
(64
one
*
[EGA]
...-.R.
Germany.
Resistance
are
in
ohms
(Q),
1/4
watt
unless
specified
otherwise.
Gain
hee
1K=1,000(Q),
1M=
1,000
k(Q)
]
SCRE
ee
*
Capacity
are
in
micro-farads
(uF)
unless
specified
otherwise.
B
or
188254
¢ All voltage values shown in circuitry are under no signal condition and
playback mode with volume control at minimum position otherwise
specified.
(Yan
ZN
0808
or 1SS254
3.3
(4.2) ]Cr02/Metai
0 28
Ce | wove [pero
INTEGRATED CIRCUITS
Nl
ow
~
OO Ok
..Voitage values at record mode.
al
:
CrOz..
Voltage
values
at
CrO,
tape
mode.
4
G24
po
cL
C1
AN7014K
Integrated
Circuit
Metal
Voltage
values
at
Metal
tape
mode.
44
NORAL
ION
1C
401
NE657N
Integrated
Circuit
Voltage
values
at
Dolby
NR
mode.
F
IC
700
AN6888
Integrated
Circuit
see
9
y
.
@
For
measurement
use
EVM.
y,
ey
.
indicates
B
(bias).
f
1200P
100
:
: :
Bias
Current
Adj.
Q3,
4
TRANSISTORS
Q3,4 2SK246Y FET
Q 13, 14, 15, 16, 17, 18
2$C3311-Q Transistor
o(
:
)
indicates
the
flow
of
the
playback
signal.
2$J103Y
*
(<=
=>)
indicates
the
flow
of
the
record
signal.
HEAD
SELECT
¢ Important
safety
notice
A
The
shaded
area
on
this
schematic
diagram
incorporates
special
features
important
Cc
Play SW
Meets ene ON with
1C1
Q
ean
PSKasey.
FET
for
protection
from
fire
and
electrical
shock
hazards.
only
.
*,
ser
Q
23,
24
2SD1330R
Transistor
When
servicing
it
is
essential
that
only
manufacturer's
specified
parts
be
used
for
Q
300,
301
the
circuit
components
in
the
shaded
areas
of
the
schematic.
2$C3311-Q Transistor
Q 600 2SD592ANC-Q Transistor
Q 601 2SB621A-R Transistor
Q 800 2SA1309Q Transistor
Q 900 2SD592ANC-Q_ Transistor
Overall Gain Adj.
* Caution!
IC and LSI are sensitive to static electricity.
DIODES & RECTIFIERS Secondary trouble can be prevented by taking care during
D1,2 MA165 Diode repair.
05,6
=
MA165
Diode
*
Cover
the
parts
boxes
made
of
plastics
with
aluminum
foil.
D
D ee ea bos 603 * Ground the soldering iron.
1$R35200
Diode
*
Put
a
conductive
mat
on
the
work
table.
ae * Do not touch the legs of IC or LSI with the fingers directly. Bias
”
SLASeYC
LED
Current
Adj.
D 703, 704, 705, 706, 707, 708
SLRS6URC LED
D 709, 710, 711, 712
@ EQUIVALENT CIRCUIT
SLRS6YC LED
D713 LN846RP LED
D
800,
801,
803,
808
1C700:
AN6888
MA165 Diode
VARIABLE RESISTORS
0
Metal-0.7
2SC3311A
TAPE SELECTOR
VR 1,2 EVND4AA00B24 P.B. Gain Adj. VR
VR 3,4 EVND4AA00B54 Overall Gain Adj. VR
VR
200
EWCS5SA000A54
Input
Level
Control
eer
VR
201
EWHFDAF15G15
Balance
Control
|
PartNo.
|
Part-Nams
8:
Description
VR 301, 302
EVND4AA00B15 Bias Current Adj. VR SWITCHES
$1,800
SSH2097
Push
Switch
oSCaaTtA
(Line/Mic
Selector!
$201-1
$200-1
$200-2
$201-2
Dolby
NR
IN/OUT
Selector)
phe
Se
Normal+>Cr02
Normal<+Metal
Normal+»Metal
Normai+>Cr02
S 200, 201
L
1,2
QLQX0343KWA
Bias
Trap
Coil
SSH3700
Push
Switch
aes
L
401,
402
(Metal/CrO,
Tape
Selector)
SPECIFICATIONS
=
*
Input
level
control...
MAX
SLM1C89-K
—
MPX
Coil
$600
A
SSH1069
Push
Switch
(Power
ON/OFF
Selector)
P|
ck
S/N
ratio
$900
SSP83
Leaf
Switch
hte
tape...QZZCFM
Greater
than
45dB
F
TRANSFORMERS
(Motor
Switch)
pes:
S$
901
SSP83
Leaf
Switch
(Play
Switch)
-
F
T300
SLO9C19-K
_Bias
Oscillation
Coil
$902
SSP83
Leaf
Switch
(Mute
Switch)
Overall
distortion
Normal......
*
Test
tape
Lu
EHEAD
><
ye)
ess
than
3.5%
1)
...QZZCRA
for
Normal
CrO2,
Metal
i]
...QZZCRX for CrO,
...QZZCRZ for Metal
T 600
[EK] A SLT5K236SA AC Power Transformer
T 600 [E]
[EGA] A SLT5K235SA AC Power Transformer
T 600
Metal(4.9)
Cr02(3.0)
~4.9 (0)
Less than 4%
QJA0454ZC Mic Jack
[M]
A
SLT5K237SA
Overall
S/N
ratio
Greater
than
43dB
* Test tape...QZZCRA (without NAB filter)
AC
Power
Transformer
only
SJS6515
DIN
Jack
13
—14—