A
8
c
D
E
F
G
H
J
WM-DDm
WM-DDm
1
2
3 4
5
6
7
9
10
11
12
13
14 15
3-2.
SCHEMATIC DIAGRAM
PB
HEAD
HP901-1
r------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
~
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
[
MAIN
BOARD
1
RVIOI
2.
2k
IOBl
.n
1.
_i
I
'•
16
1"',.'--1.._
4
_._---Jif----,
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LEVELj
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12.
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3
0.
0039
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1.4
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R104
33k
39k-I1
t----+-1•.
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13
R105
~
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C102
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C301
T ' I
C301
2
r
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86
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_
5
(PRE
AMPl
12
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02
6
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Cl04
3. 3
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16
R106
47k
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15
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13
12
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I
C302
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AM
IDOLBY
AMPl
;
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..............................
;
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4
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r
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(
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~
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1.4
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,.
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,.,.,..,
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IC303
TA7688F
CHEAD
PHONE
AMPl
+
C317
1
16V
.__
___
.......
-e-___.:AV~
J301-2
1m
~
.......................................................................................................
:
I 2
6 7
I
C312
o.
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I
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4
5
~0
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(
CHASSIS)
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R303
22k
R212
3. 9
PB
HEAD
7
10~.
4 33k
R202
•
4V
R204
Cf.
0
3
4
'JL
HP901-2
C20~201
•
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•• ••••
R203
Rl~k5
150k
R206
47k
4---i
1--+--i
p+~
C207
R
20
k
9
C209
B~~~
0. 0047
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0. 0068
20
V
RV301-2
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I.
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36
+
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220
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47k
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680k
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l+~f=o~-.tr-=""*'=*--....__==f=l
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8
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R301
C208
o. 033
D302
R215 R115
1S2r-83_7__,..--~471r-k--r-lf?~
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47k
R21
6
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l
;;.
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I
I
I
I
9
·~1.
35
C203
~
8302 lk
'-----'
o. 0039
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c
202
IDOLBY
NRI
R602
2.
2k
.n
1e
'------R-IV2~0-I
...__+...t,.f--J
IQITJ-
[illj]
R601
!OK
2.
2k
IOBl
o.
65
R207
430k
R208
3.
3k
.-----+---+--+----_._-+-----'C210
C303
+
C304
C321
0.1 , g
lOOp
Q60
1
2SB798
C
6
l o
SWITCHING
Jv
+
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R
611
0
3
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C616
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5.
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R610
lOOK
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1
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45
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t----~~~~
R612
220k
...
R609
150k
C612
o.
01
C61~
o.
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3. 3
25V
R614
!OK
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R302
Q302
lOOk
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MUTING
~
0.
16
9
8 7 6 5
R605
15
U
13 12
II
10
Q703
1M
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2SC1623
R304
lOOk
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C309
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DC-DC
L701
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s
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IC602
MSM58141RS
IC601
CX20084
NOTE
R701
RECTIFIER
I
1
2Vp-p
CPLLl
PLL
ON/OFF
AP
CSERVO
AMP>
:.·
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8
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2.
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MUTING
D301
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Q303
2SB624
REGULATOR
2.
2 5
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R308
330
R307
22k
R309
47k
R310
2.
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RV601
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~
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6
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1
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~~--~----[DC
IN
3VI
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./_..--PLAY
76mA
""
FF
SOmA
REW
65mA
I
C
16
~P
1
WP
2
~
630
P
3
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+
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+
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1160
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6
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BATTERY
L
'----..._
_
___.
__
...._
_ ___..,___f-----+-----41-----f---.--_.
_____
.._l _
_.
__________
--+---------
.....
----t_-..._
__
_.
___
c
__
_.
___
--4.,___.._-t----_..---
..
Ao-U-T_o_oF_F_._+---<;r---'T
SIZE"AA''
L....---------1-------l------l------+----------------------------------------~----------------------------------------------------~
(IEC
DE~:NATION)
-
------
-
------
-
------
-
------
-
----~--~r--~r---¢----
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
------
-
-----~
2PCS
3V
l®--
M901
MNR-1601A
MOTOR
L@-
FG901
FG
COl L
*1
All capacitors
are
in
,uF
unless
otherwise noted.
pF:
.u.uF
50WV
or
less
are not indicated except
for
electrolytics
and tantalums.
•
-=
B+bus.
c=J
:
adjustment
for
repair.
Power
voltage
is
3 V
and
fed
with
regulated de
power
supply
from
Waveforms
are
taken
to
ground
in
PLAY
mode
by
using
oscilloscope.
Voltage
variations
may
be
noted
due
to
normal
produc-
tion
tolerances.
• Touching the pin No.
11
of
IC601 with the tester probe
causes
an
extra vibration inside the IC, which will
be
heard from the phones
as
a high-pitched sound.
All
resistors
are in n and
1/
4
W or
less
unless
otherwise
specified.
L-CH signal
path
-•
......
: R-CH signal
path
-11-
Voltage
variations
may
be
noted
due
to
normal
produc-
tion
tolerances.
Switches:
Ref.
No.
S301
S302
S901
Switch
TAPE
DOLBY
NR
POWER
Positi n
NORM
OFF
ON
•
If
the pin No.
11
of
IC601
is
touched
with
the tester
probe, the
voltage there will increase, and after about 1
seco11d
it
will
get
higher than O.SV,
so
that
the motor
M901 will stop.
-12-
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