Sony Walkman WM-EX2000, Service Manual

Page: 9 / 23

WM-EX2000
— 9 — — 10 — — 11 —
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM
SECTION 4
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head pinch roller
capstan rubber belt
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (DC 1.3 V) unless otherwise noted.
Torque Measurement
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
• Supplied voltage : 1.3 V
• Switch and control position
VOL switch : NORM
• Remote control position
HOLD switch : OFF
VOL control
: MAX
SOUND mode : NORM
DOLBY mode : OFF
Test tape
Tape Speed Adjustment
Procedure :
1. Playback WS-48A (tape center part) in the FWD state and adjust
RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value :
2. Check that frequency counter reading is within 2% of reading
of step 1.
Adjustment Location :
Digital frequency counter
2,985 to 3,015 Hz
Type
WS-48A
Signal
3 kHz, 0 dB
Used for
tape speed adjustment
Mode Torque Meter Meter Reading
1.47 – 2.45 mN • m
FWD
CQ-102C
(15 – 25 g • cm)
FWD 0.03 – 0.20 mN • m
back tension (0.3 – 2.0 g • cm)
1.47 – 2.45 mN • m
REV
CQ-102RC
(15 – 25 g • cm)
REV 0.03 – 0.20 mN • m
back tension (0.3 – 2.0 g • cm)
more than 3.43 mN • m
FF, REW CQ-201B
(more than 35 g • cm)
+
–
i
test tape
WS-48A
(3 kHz, 0 dB)
set
REMOTE jack (J301)
32
Ω
frequency counter
RV601
AMS IN
DOLBY CTL
BOOST CTL
F/R CTL
SURRUND CTL
MEGA BASS CTL
XT0
XT1
CASSETE SW
PHOTO CTL
PHOTO (T) IN
39
BEEP 36
20
48
8
RV CTL 7
10
9
28
29
5
19
38
PHOTO (S) IN
39
SPEED DTL
18
MOTOR START 41
MOTOR U 47
MOTOR V 46
MOTOR W 45
CTRL 1
44
CTRL 2
43
MOTOR DIR
42
40
X701
32.768kHz
MUTE CTL 12
SURROUND
SWITCH
Q308
SURROUND
SWITCH
Q310
SURROUND
SWITCH
Q313
PLUNGER
DRIVER
Q701
RESET
IC704
MB&RV
CONTROL
Q302
REVIVE
CONTROL
Q304
HI UP
CONTROL
Q307
RIPPLE
FILTER
RIPPLE
FILTER
Q309
VOL MAX
SWITCH
Q311
DOLBY
SWITCH
Q316
VOL MIN
SWITCH
Q312,314
METAL
EQ AMP
Q305(1/2)
T REEL
SENS
PH701
MOTOR
SW
Q601
-1
(TAPE IN)
-2
(ATS)
12
10
41 39 40 42 43 44 46
S REEL
SENS
PH702
INV.
Q703(2/2)
MOTOR
START SWITCH
Q602
RV601
TAPE
SPEED
21
30
29
28
S704
P-SIG
AMP CTL 11
16
17
15
1
36
35 4
5
6
7
8
9
10
31
32
34
19
2
MOTOR SERVO
IC601
9
11
13
2
4
6
8
7
10
12
1
3
5
MOTOR
DRIVE
Q603
9
1
2
SWITCH
MTL DRV
BEEP
BEEP M/N SW F/R SW BST SW PW SW MT SW
AMS
IN
PRE OUT R
PRE OUT L
PRE NF L
PRE NF R
+
–
+
–
7
6
5
4
3
AUDIO AMP
IC301 (1/2)
VREF
FWD L
FWD R
REV L
REV R
L
R
L
R
REF V
ICI1
VI1
VI2
IV
U IN
V IN
W IN
CTRL 1
CTRL 2
DIR
PSIG
UT
VT
WT
UT
VT
WT
WS
VS
US
TU
TW
TV
TU
TW
TV
W
V
U
W
V
U
C
16
WS
VS
US
W OUT
V OUT
U OUT
MCENTER
MC
B+
(BATT)
SYSTEM
CONTROL
IC705
6
PM CTL
DATA/RMUM
1
AUDIO ATT
17
RESET 35
1 2
A/B SW 13
FWD SW
CEN SW
RVS SW
2
BATT DET 15
NOIZE SELECT 14
B+
(DDC)
SURROUND
CONTROL
Q303
9
SURROUND AMP
IC302
VCC
B+
(DDC)
B+
(+2.0V)
S301
MIN
NORM
MAX
PW IN C
PW IN R
PW IN L
PW NF R
PW NF L
26
32
27
28
21
35
22
20
+
–
+
–
METAL
EQ AMP
Q305(2/2)
+
–
PW OUT L
PW OUT R
33
34
17 18
BASE
RF OUT
PW OUT C
AGC IN
AGC
DET
AUDIO AMP
IC301 (2/2)
B+ (BATT)
S702
FWD
CNT
REV
S701
(A/B)
KEY IN 16
4
3
1
2
3
4
7
1 2
8
OUT1
OUT2
OUT3
OUT4
CE
VCC
VOLTAGE DETECT
IC703
STOP
IC702
LX
V OUT
B+
(BATT)
B+ (BATT)
5 1
2
DC/DC CONVERTER
IC701
B+
(BATT)
B+
(DDC)
RECHAGEABLE
BATTERY
NH-14WM(1.2V 1400mA)
BATTERY CASE
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
1PC, 1.5V
GND
REMO
DATA
VCC
J301
CAPSTAN
/REEL
MOTOR
M601
HP701
(PLAYBACK)
L CH
R CH
FWD
L CH
R CH
REV
INV.
Q703(1/2)
• Signal path
: PB
B+ (BATT)
PW
OUT IN
D702
L701
Q702
+ +
F701
0.25A
W702
PM701
(PLUNGER)
16
1
10
7
DOLBY
SWITCH
Q315
DOLBY AMP
IC303
VCC
11
14
4
+
10
5
CUE/REV
CONTROL
Q317
15 14
11
AMS OUT
AMS DET
PW
Q306
INV.
29
JOG
S703 JOG
PUSH
STOP
SW
BST OUT
BST NF
Q301
BUFFER
VOL w
Y/x