Sony WM-EX190 - Walkman Cassette Player Manual de usuario
WM-EX190/EX192
US Model
Canadian Model
WM-EX190
AEP Model
E Model
Chinese Model
WM-EX190/192
SERVICE MANUAL
CASSETTE PLAYER
MICROFILM
SPECIFICATIONS
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MT-WMEX192-114
•Power requirements
3V DC batteries R6 (AA) ×2
•Dimensions
82 ×111.5 ×34.5 mm
(w / h/ d) incl. projecting parts and controls
•Mass
Approx. 115 g / Approx. 190 g incl.
batteries and a cassette
•Supplied accessories
Stereo headphones or Stereo earphones (1) / Belt clip (1)
Design and specifications are subject to change without notice.
Photo :WM-EX192
Ver 1.0 2000.01
— 2 —
TABLE OF CONTENTS
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron aroud 270˚ C during
repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
SECTION 1
GENERAL
1. GENERAL ······································································ 2
2. DISASSEMBLY
2-1. Cabinet (REAR) ································································· 3
2-2. Main Board········································································· 4
2-3. Lid, Cassette ······································································· 4
2-4. Mechanism Deck ································································ 5
2-5. “BELT” “MOTOR” “PINCH LEVER” “HEAD,
MAGNETIC” ····································································· 5
3. MECHANICAL ADJUSTMENT ······························ 6
4. ELECTRICAL ADJUSTMENT ································ 6
5. DIAGRAMS
5-1. Block Diagram ··································································· 7
5-2. Printed Wiring Board·························································· 9
5-3. Schematic Diagram ·························································· 11
5-4. IC Block Diagram ···························································· 13
6. EXPLODEDVIEWS
6-1. Cabinet Section································································· 14
6-2. Main Board Section·························································· 15
6-3. Mechanism Section-1 ······················································· 16
6-4. Mechanism Section-2 ······················································· 17
7. ELECTRICAL PARTS LIST ··································· 18
This section is extracted
from instruction manual.
— 3 —
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR)
•This set can be disassembled in the order shown below.
Cabinet (rear)Set Main board
Lid assy, cassette
Mechanism deck Belt
Motor
Pinch lever (N) assy
Head, magnetic
A
1
Two screws (B1.7
×
9
)
2
Open the lid, cassette
3
Cabinet (rear)
(There 16 claws of
A
to
P
are caught.)
B
K
M
L
C
N
O
P
D
E
F
G
H
I
J
— 4 —
2-2. MAIN BOARD
2-3. LID ASSY, CASSETTE
1
Remove the solders.
2
Screw (M1.4
)
Claw
3
MAIN board
(There is a claw.)
2
Spring (torsion)
5
Lid assy, cassette
1
Open the lid, cassette
3
Release the catc
h
4
Release
the catch
— 5 —
2-4. MECHANISM DECK
2-5. BELT, MOTOR, PINCH LEVER (N) ASSY,“HEAD, MAGNETIC”
1
Remove the mechanism dec
k
in the direction of the arrow.
(There two claws.)
Two claws
2
Two screws (M1.4)
5
Two screws (M1.4)
3
Motor (reel/capstan)
6
Head,magnetic (playback)
4
Pnch lever (N) assy
1
Belt
Motor (reel/capstan)
Wheel assy (sp), capstan
Belt threading
Belt
— 6 —
SECTION 3
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. The adjustments should be performed with the rated power
supply voltage (3.0 V) unless otherwise noted.
Torque Measurement
SECTION 4
ELECTRICAL ADJUSTMENT
PRECAUTION
• Supplied voltage : 3.0V
• Switch position
AVLS switch : NORM
MEGA BASS switch : OFF/NORM
Test tape
Tape Speed Adjustment
Procedure :
1. PlaybackWS-48A (tape centerpart) in the REV state andadjust
RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value :
2. Playback WS-48A (tape counter part) in the FWD state.
Check thatfrequencycounterreading is within 1.5% ofreading
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
20 – 30 g • cm
FWD CQ-102C (0.28 – 0.42 oz • inch)
FWD less than 2 g • cm
back tension (less than 0.03 oz • inch)
more than 40 g • cm
FF, REW CQ-201B (more than 0.56 oz • inch)
i
test tape
WS-48A
(3 kHz, 0 dB)
set
jack (J301)
16
Ω
frequency counter
RV601:
Tape speed adjustment
[MAIN BOARD]
WM-EX190/EX192
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM
— 7 — — 8 —
MVREF
34
L10 5 30
28 24 22
RV301
VOLUME
16
R12 7 29
27 25 23 20
LOW
BOOST
V REF
322613
MEGA BASS
GROOVE NORM
MEGA BASS OFF
(EX192)
(EX190)
S503
S305-1
S305-2
NORM LIMIT
18V REF
FWD/REV
OSC
43
1
47
B+
HP901
PLAYBACK HEAD
IN+
35
TH601
RV601
TAPE
SPEED
OPERATION
DET
CURRENT
DET
PULSE
DET
OPERATION
LOGIC
PRE
DRIVE
39
40
41
2 44 45 46
V
U
W
M901
REEL/CAPSTAN
MOTOR
i
J301
21
POWER MUTE
19VCC
3S/S
Q301
10K/47K
TAPE
POWER
S301
BATTERY
DRY
3.0V
D150
(POWER) +B+
AVLS
• Signal path.
E: PB
WM-EX190/EX192
— 9 — — 10 —
5-2. PRINTEDWIRING BOARD
Note on Printed Wiring Board:
•X: parts extracted from the component side.
•b: Pattern from the side which enables seeing.
C344
TP14
RV601
R610
R611
R608
JR18
TP3
JR37
JR35
JR29
JR7
JR28
JR12
JR10
JR14
JR11
JR32
JR26
JR24JR25
JR22
C319
C327
C338
C341
C324
C101
C332
C336
C334
C109
C209
R324
TP4
TP13
TP12
JR27
JR36
JR31
JR30
JR33 JR34
JR17
EX192
MODEL
EX190
MODEL
JR16
JR19
JR20
JR3
JR23
JR1
JR21
R207
R107
JR8
JR4
JR2
R209
R109
JR9
JR15
Q301
D150
C337
IC301
C605
C606
R606
TP1
TP9
TP15
TP10 TP11
TP2
TH601
C335
R327
D302
C342
C321
C333
C325
C105
C205
R103
R205
C203
C107
C108
C208
R203
R204
R150 R206
R106
R105
R609 C608
C603
C602
C601
R601
JR13
JR38
JR5
JR6
C201
C604
R605
C103
R104
R108
R208
R110
R210
C207
TP5
TP7
16
TP8
TP6
1
12
13 24
25
36
3748
R
L
HP901
PLAYBACK HEAD
M901
REEL/CAPSTAN
MOTOR
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS, 3V COM
W
V
U
J301
MAIN BOARD
C204
C104
S305
AVLS
RV301
VOLUME
NORM
LIMIT
(POWER)
S301
(TAPE POWER)
S303
OFF : EX190MEGA BASS
NORM : EX192MEGA BASSGROOVE
11
(11)
E
L
R
REF
GND
1-675-493
C609
C343
R325
EX192 MODEL
12
A
B
C
D
E
F
345678910
Ref. No. Location
D150 F-3
D302 B-2
IC301 D-4
Q301 E-4
• Semiconductor
Location
WM-EX190/EX192
5-3. SCHEMATIC DIAGRAM
— 11 — — 12 —
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
• % : indicates tolerance.
•C: panel designation.
•U: B+ Line.
•H: adjustment for repair.
• Total current is measured with no cassette installed.
• Power voltage is dc V and fed with regulated dc power
supply from external power voltage jack.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : STOP
( ) :PLAY
• Voltages aretakenwithaVOM(Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
E: PB
• Abbreviation
CND : Canadian model
FR : French model
EA : Saudi Arabia model
• Refer to page 13 for IC Block Diagram.
68
15
15
EX190 : E/
EX192 : AEP, E, EA
2.2M
C609
1000p
C343
1000p
R106, R206
150 : EX192: FR
100 : EXCEPT EX192: FR
R104, R204
680 : EX192: FR
470 : EXCEPT EX192: FR
WM-EX190/EX192
NOTE:
• -XX, -X mean standardized parts, so they may
have some differences from the original one.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delayshouldbeanticipatedwhenorderingthese
items.
SECTION 6
EXPLODEDVIEWS
• The mechanical parts with no reference number
in the exploded viewsare not supplied.
• Abbreviation
CND : Canadian model
FR : French model
EA : SaudiArabia model
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑ ↑
Parts of Color Cabinet’s Color
IC301 LB8115W-TLM
5-4. IC BLOCK DIAGRAM
— 13 — — 14 —
1
236
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37
COM
RI
VREF
POWER OUTC
POWER OUT2
VCC
POWER MUTE
POWER IN1
POWER IN2
MIX OUT1
MIX OUT2
LP.2
R. P2
R.P1
DET OUT
MVREF
IN+
VSP
LOW BOOST IN2
LOW BOOST IN1
LOW BOOST SW
M-GND
R.VREF
PRE MUTE SW
(FWD/REW)
POWER OUT1
POWER GND
MVCC
DR
WOUT
MP-GND
VOUT
UOUT
FC
OUT
OSC
UB
VB
WB
3
4
5
6
7
8
9
10
11
12
PRE NF1
PRE OUT2
PRE NF2
PRE FWD IN2
PRE REV IN2
PRE REV IN1
PRE FWD IN1
S/S
PRE GND
PRE OUT1
BIAS
R.F
REF SYS
CONT
DET
VREF
SPEED
LOW
BOOST
PRE DRIVER
OPERATION LOGIC
OSC
PLUSE DET
REF
VOLTAGE
REF VOLTAGE
FOR SPEED CONTROL
CURRENT
DET
OPERATION
DET
FWD/
REV
FREQ
CARC.
+
–
1
2
3
5
4
78
9
6
mechanism
not supplied
6-1. CABINET SECTION
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 X-3378-625-1 LID ASSY, CASSETTE (GRAY)(EX190)
1 X-3378-626-1 LID ASSY, CASSETTE (BLUE)(EX190)
1 X-3378-627-1 LID ASSY, CASSETTE (GREEN)(EX190)
1 3-040-914-01 LID,CASSETTE (GOLD)(EX192)
1 3-040-914-11 LID,CASSETTE (BLACK)(EX192)
1 3-040-914-21 LID,CASSETTE (BLUE)(EX192)
2 3-019-949-01 SPRING (TORSION)
3 3-041-234-01 SPRING (CASSETTE)
4 3-040-908-01 CABINET (FRONT)(EX190)
4 3-040-908-11 CABINET (FRONT)(EX192)
5 3-040-911-01 KNOB(MEGA BASS) (EX190)
5 3-040-915-01 KNOB(GROOVE) (EX192)
6 3-040-909-01 CABINET (REAR)
7 3-040-910-01 LID,BATTERY CASE
8 3-022-346-01 LENS
9 3-318-203-92 SCREW(B1.7X9), TAPPING
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