Sony HCD-EP40 - Main Board Schematic Diagram (2;2) & Headphone Board; System Controller and Audio Circuits

HCD-EP30/EP40
1717
IC B/D
POWER
BOARD
CN402
E
CASSETE
BOARD
B
MAIN BOARD
(1/2)
1
DISPLAY
BOARD
D
DISPLAY
BOARD
C
9P
9P
5.3 4.8 7.8
0
0
3.6
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.9 3.9
3.6
0
0
3.9
0.1
1.9
1.4
2.1
1.9
2.1
1.4
5.66.2
13.5
9.9
9.3
13.7
0
MEGA BASS
ON : 0.1
OFF : 0.7
0
MEGA BASS
ON : 0.1
OFF : 0.7
0.8 (9.5)
13.7
0.8
(10)
0.6 (13.6)
13.7
13.6
(12.9)
13.6
(0)
0
(0.7)
0.6
(0)
13.7
13.7
13
0.3
0.7
0
0 [0.6]
0
0 [0.6]
0
[0.6]
0 [1.1]
0
16.4
0.6
0.6
0
16.1
8.7
8.7
16.1
16.7
8.7
CN201
9P
3.9k
3.9k
50V
+
+
1 50V
Q201, 202
REC AMP
+
+
+
4700p
+
0.1
0.1
0.1
0.0082
0.0039
0.0033
0.047
8.2k
0.027
0.1
0.1
0.1
0.0082
0.0039
5.6k
8.2k
0.027
0.047
0.0033
+
4.7
50V
+
50V
6.8k
0.001
8.2k
4.7
50V
+
+
50V
+
+
50V
50V
4.7
50V
6.8k
8.2k
0.001
4.7k
4.7k
2.2k
3.3k
2.2k
3.3k
50V
+
IC203
FUNCTION SELECT SWITCH,
ELECTRICAL VOLUME
MTZJ-6.2B
Q312
+6V REGULATOR
+
0.022
50V
+
+
10V
MTZJ-10B
Q313
+9V REGULATOR
+
0.022
+
MTZJ-10B
4.7k
Q310, 311
REGULATOR CONTROL
SWITCH
Q305, 306
B+ SWITCH
0.022
+
50V
+
DC_15V
0.1
+
+
50V
Q301, 302
MUTING
Q308, 309
+9V REGULATOR
0.001
+
16V
+
16V
+
50V
0.001
50V
+
Q314
MUTING CONTROL
SWITCH
IC301
POWER AMP
+
25V
+
+
0.15
0.15
++
25V
PHONES
CN301
5P
+
–
+
–
R
L
SPEAKER
IMPEDANCE
USE 4Ω
+
–
+
–
BIAS CIRCUIT,
HEAT OPERATION
PROTECTION CIRCUIT
MAIN BOARD
(2/2)
CN202
4P
M201
(CAPSTAN/REEL)
S201
(PLAY)
0.1
AM FREQ STEP
10 kHz
R
9 kHz
+
Q205, 206
MEGA BASS
ON DRIVE
1N4148TP
1N4148TP
1N4148TP
1N4148TP
1N4148TP
1N4148TP
1N4148TP
U
1
u
U
2
u
U
3
u
U
4
u
BEAT
RL
RR
GND
PL
PR
9V
SYNC
COTR
0.047
2200p
16V
16V
16V
5.6k
2SD1616-L
+
2SD1616-L
2SD1616-L
1N4148TP
1N4148TP
1N4148TP
1N4148TP
2.7k
2.7k
2200p
9P
*
CD
BLOCK
*
SUPPLIED AS THE
ASSEMBLED BLOCK
CDDATA CDCLK CDRS DAT CLK CE DBBS BEAT SYNC
9K/10K MUTE PSW GND LED V+ TU –SW TA –SW CD –SW 6V
6
1
1
2
3
4
5
6
7
5
1
HEADPHONE BOARD
3.3k
3.3k
6-3. SCHEMATIC DIAGRAM – MAIN (2/2)/HEADPHONE Boards –• See page 24 for IC Block Diagram.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : TUNER (FM/AM)
( ) : CD PLAY
[ ] : TAPE PLAY
(Page 19)
(Page 16)
(Page 21)
(Page 21)
(Page
22)
w w w . x i a o y u 1 6 3 . c o m
Q Q
3
7
6 3
1 5 1 5
0 9 9
2
8 9
4 2
9 8
T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3
Q Q
TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com