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Model
CMT-EP303 HCD-EP303
Pages
42
Size
2.19 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-ep303-hcd-ep303.pdf
Date

Sony CMT-EP303 / HCD-EP303 Service Manual ▷ View online

21
21
HCD-EP303
6-3. Printed Wiring Board  MAIN Section
• See page 16 for Circuit Boards Location.
IC203
IC101
IC102
IC301
L110
AM FERRITE-ROD
ANTENNA
A
K
A
K
MAIN BOARD
E
E
E
A
K
TP10
(FMVT)
TP11(AMVT)
1
2
3
A
A
K
K
E
FM 
ANT
ANT1
E
E
AM FREQ
STEP
9 kHz
10kHz
EXCEPT AEP,UK
SPEAKER
(IMPEDANCE USE 4
 )
SPK301
+
+
L
R
A
A
K
K
A
K
A
K
A
A
A
A
K
K
A
K
A
A
K
K
K
A
A
A
K
K
K
A
K
A
A
K
K
K
S201
M201
(PLAY)
(CAPSTAN/REEL)
M
2
1
3
4
B
CASSETTE
BOARD
(Page 24)
C
DISPLAY
BOARD
(Page 25)
D
DISPLAY
BOARD
(Page 25)
A
DISPLAY
BOARD
(Page 25)
E
E
E
E
E
CD
BLOCK
*
*
 SUPPLIED AS THE
      ASSEMBLED BLOCK
E
E
E
E
E
HEADPHONE BOARD
JK401
PHONES
3
4
5
6
1
2
1
5
E
POWER BOARD
CN402
(Page 27)
EXCEPT
AEP,UK
D309
A
B
C
D
E
F
G
H
I
1
2
3
4
5
6
7
8
9
10
11
Ref. No.
Location
D101
C-5
D102
C-5
D103
B-8
D104
C-9
D105
B-6
D306
G-7
D307
H-9
D308
G-8
D310
H-9
D311
I-9
D312
G-7
D314
G-7
D316
G-7
D317
H-9
D331
D-6
D332
D-6
D333
E-7
D334
F-7
D335
G-7
IC101
B-10
IC102
D-9
IC203
E-5
IC301
G-5
Q101
D-10
Q102
C-10
Q104
B-11
Q116
E-11
Q201
D-4
Q202
E-4
Q205
F-5
Q206
D-4
Q301
F-6
Q302
F-6
Q308
H-8
Q309
H-8
Q310
H-8
Q311
H-8
Q312
G-7
Q313
I-8
Q314
G-7
ZD302
H-7
ZD304
I-6
ZD305
G-7
• Semiconductor
Location
22
22
HCD-EP303
6-4. Schematic Diagram  MIAN Section (1/2)
IC B/D
IC B/D
DSIPLAY
BOARD
A
(Page 26)
MAIN BOARD
(2/2)
1
(Page 23)
0
6.4
6.4
6.4
0.7
1.2
1.2
1.2
0
4.5
5.8
0.6
1
0.6
0
5.8
2.8
2.1
0.9
1.2
1.3
6.6
6.4
0
2.3
0
4.7
1
1
1.5
2.3
9.7
9.7
8.9
0
5.1
5
5.3
0.1
0.1
2.3
0
3.7
6.4
6.4
1.3
1.3
1
FM
LEAD
ANTENNA
ANT1
FM ANT
C134
0.001
C104
0.001
C107
0.001
C114
0.01
C111
0.001
Q101
2SC1923-O
FM OSC BUFFER
R104
1.2k
R136
6.8k
R168
6.8k
C119
1u
50V
C108
4.7u
50V
D105
SVC348T
C135
390p
C131
0.047
C130
10u
50V
R135
4.7k
Q104
2SC945TP
AMP
C127
0.047
C161
0.1
L110
AM-FERRITE-ROD
ANTENNA
B P F
C113
0.01
C120
1u
50V
C156
47u
16V
C126
0.01
C112
0.001
C147
0.01
C148
2.2u
50V
R147
2.2k
C151
0.1
C163
100u
16V
Q116
2SA733TP-P
B+ SWITCH
X102
7.2MHz
C114
0.022
R145
4.7K
R118
3.3k
X101
10.7MHz
F101
10.7MHz
R148
5.6k
C145
100p
C146
0.001
C117
0.0068
C129
4.7u
50V
C118
0.0068
Q102
2SC945TP
BAND
SWITCH
C112
0.22u/ 50V
C123
0.47u/ 50V
C124
1u/ 50V
R112
3.3k
C105
0.001
C157
0.1
TP10
(FM VT)
IC101
AM/FM IF AMP,
MIX, MPX, DET, OSC
IC102
FM/AM PLL
C116
0.022
C162
0.022
TP11
(AM VT)
MAIN BOARD
(1/2)
L103, TC101
FM TRACKING
L104
FM FREQUENCY
COVERAGE
T102
L110, TC102
AM TRACKING
AM FREQUENCY
COVERAGE
33p
33p
• See page 17 for Waveforms.
• See page 29 for IC Block Diagrams.
23
23
HCD-EP303
6-5. Schematic Diagram  MIAN Section (2/2)
CASSETTE
BOARD
B
(Page 24)
MAIN BOARD
(1/2)
1
(Page 22)
IC B/D
DISPLAY
BOARD
C
(Page 26)
DISPLAY
BOARD
D
(Page 26)
POWER
BOARD
CN402
E
(Page 28)
5.3
2
1.4
2
1.7
9.7
10.3
15.3
0.7
0
8.6 <0>
15.4 <15>
15.2 <0>
0 <0.7>
0 <0.7>
0
0
9.1
0.6
0.6
17.7
0
0.7
0.6
0
0.7
0
9
16.9
16.9
9
17.3
0.6 <0>
15.4 <9.3>
0 <9.3>
0.9
<9.3>
6.1
5.5
2.1
1.4
2.1
4.7
8.1
0
0
3.8
4
4
4
4
4
4
4
4
0.7
0
4
4
4
4
4
4
4
4
3.8
0
4
0.1
0
SPK301
C306
0.15
C343
10
50V
C341
10
50V
D311  1N4148
D310  1N4148
C317
0.022
Q309
2SA733TP
Q308
KTD2058Y
Q313
SC1383
C327
0.022
D317
1N4148
D307
1N4148
D308
1N4148
D309
1N4148
Q311
2SC945TP-QP
Q310
2SC945TP-QP
Q310, 311
REGULATOR
CONTROL SWITCH
Q308, 309
+8V REGULATOR
Q313
+9V REGULATOR
Q312
+6V REGULATOR
Q312
2SD1616-L
C201
0.1
C329
0.9
C323
0.022
R323
4.7k
ZD302  MTZJ-T-72-9.1B
ZD304  MTZN-T-72-10B
ZD305
MTZJ-T-72-6.2B
1
6
C305
0.15
JK401
1
5
PHONES
IC203
FUNCTION SELECT SWITCH,
ELECTRONIC VOLUME
HEADPHONE BOARD
C250
10u
50V
C240
0.0022
R242  3.3k
D333 1N4148
R265
2.7k
R264
2.7k
R267
10k
R266
10k
C249
0.0022
* CD
     BLOCK
* SUPPLIED AS THE ASSEMBLED BLOCK
R243  3.3k
AM FREQ STEP
EXCEPT AEP,UK
10 kHz
9 kHz
D306
1N4148
D314
1N4148
Q301
2SC3623-LK
Q206
2SC945TP
MEGA BASS
R303
4.7k
C246
0.001
R240
8.2k
R250
10k
R248
2.2k
R234
6.8k
C248
0.1
50V
C242
4.7u
50V
C230
0.0082
C226
0.0033
C220
0.027
C216  0.0082
C222  0.0088
C206  0.1
Q201
2SC945TP
Q202
2SC945TP
R211
3.9k
R210
3.9k
C204
1u
50V
Q201,202
REC AMP
C203
1u
50V
C210  0.1
C208  0.1
C205  0.1
C225
0.0033
C229
0.0082
C241
4.7u
50V
C209  0.1
C207  0.1
R215  5.6k
R219  8.2k
C215  0.0082
C219  0.027
C221  0.0082
C214
2.2u
50V
C214
2.2u
50V
C212  2.2  50V
D316
1N4148
D312
1N4148
C315
10
50V
C301
0.001
C342
10
50V
R343
10K
Q302
2SD1616-L
C302
0.001
Q314
2SC945
TP-QP
Q314
MUTING
CONTROL
SWITCH
R220  8.2K
R216  8.2k
C211
2.2u
50V
C245
0.001
R245
6.8K
R239
8.2k
R304
4.7k
R247
2.2k
R249
10k
Q205
2SC945TP
MEGA RASS
C247
0.1
50V
C213
2.2u
50V
+
+
BIAS CIRCUIT,
HEAT OPERATION
PROTECTION CIRCUIT
IC301
POWER AMP
R
L
SPEAKER
(IMPEDANCE
USE 4
¶)
MAIN BOARD
(2/2)
C251
4700p
Q301,302
MUTING
0.1
EXCEPT
AEP,UK
EXCEPT
AEP,UK
• See page 30 for IC Block Diagrams.
24
24
HCD-EP303
6-6. Printed Wiring Board  CASSETTE Section
• See page 16 for Circuit Boards Location.
6-7. Schematic Diagram  CASSETTE Section
0
1.2
1.4
4.1
0
0
8.1
0
0
4.1
1.4
1.2
0
0.6
0
0.6
0
0
0
0
3.6
9.7
9.7
9.3
No mark:FM
2
R-CH (REC/PB)
L-CH (REC/PB)
(ERASE)
HRPE701
(REC/PB ERASE HEAD)
CN701
4P
0.0018
15k
15k
0.0018
SW701 (4/6)
(REC/PB)
REC
R
PB
SW701 (2/6)
(REC/PB)
REC
r
PB
SW701 (3/6)
(REC/PB)
REC t PB
0.0027
0.022
+
50V
0.022
0.0068
Q706
REC BIAS OSC
SW701 (6/6)
(REC/PB)
REC T PB
Q704
2SC945
MUTING
CONTROL
SWITCH
25V
+
+
+
50V
5.6k
1.2k
0.1
SW701 (1/6)
(REC/PB)
REC
R
PB
0.1
50V
+
+
0.022
50V
+
+
0.1
50V
+
+
0.1
5.6k
1.2k
IN1
NF1
PC1
OUT1
GND
IN2
NF2
PC2
OUT2
VCC
ALC
IN1
ALC
CONST
ALC
IN2
RF
SW701 (5/6)
(REC/PB)
REC
r
PB
50V
+
IC701
ALC, REC/PB AMP
Q701, 702
MUTING
50V
50V
82k
2SC945
2SC945
2SC945
82k
+
+
CASSETTE BOARD
0.0015
0.0015
330
2SD1616-L
50V
100k
1N4148TP
1N4148TP
4.7k
(Page 23)
Q703
2SC945
MUTING
CONTROL
SWITCH
MAIN
BOARD
(2/2)
CN201
B
IC B/D
IC701
CASSETTE BOARD
B
MAIN BOARD
CN201
(Page 21)
1
2
3
4
5
6
E
E
E
E
E
K
A
A
K
SW701
(REC/PB)
REC
PB
HPRE701
REC/PB ERASE
HEAD
A
B
C
1
2
3
4
5
Ref. No.
Location
D701
B-4
D702
B-4
IC701
B-3
Q701
A-4
Q702
B-4
Q703
B-4
Q704
A-2
Q706
C-2
• Semiconductor
Location
• See page 17 for Waveforms.
• See page 30 for IC Block Diagrams.
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