Read Sony CMT-EP303 / HCD-EP303 Service Manual online
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
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
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
4700p
Q301,302
MUTING
0.1
EXCEPT
AEP,UK
EXCEPT
AEP,UK
• See page 30 for IC Block Diagrams.
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