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6-3.
SCHEMATIC DIAGRAM – MAIN (2/2)/HEADPHONE Boards – •
U
U
U
1
2
3
u
u
u
MAIN BOARD
CN201
9P
BEAT
RL
RR
GND
B
PL
CASSETE
PR
BOARD
(Page 17)
9V
SYNC
COTR
0.047
3.9k
3.9k
Q201, 202
REC AMP
+
16V
S201
0.1
(PLAY)
M201
(CAPSTAN/REEL)
CN202
4P
See page 22 for IC Block Diagram.
MAIN BOARD
(Page 14)
1
(1/2)
U
4
u
(2/2)
+
2200p
0.0033
0.047
+
2.1
1.9
50V
1.4
0.0082
0.027
1.4
3.9
1.9
0.027
0.0082
+
2.1
1 50V
0.0033
0.047
+
+
16V
4700p
16V
MTZJ-6.2B
(Page 19)
C
DISPLAY
BOARD
9P
IC203
FUNCTION SELECT SWITCH,
ELECTRICAL VOLUME
IC B/D
+
50V
0
4.7
1N4148TP
3.3k
6.8k
50V
+
MEGA BASS
1N4148TP
ON : 0.1
2.2k
8.2k
+
OFF : 0.7
50V
+
0.001
50V
4.7k
Q205, 206
MEGA BASS
ON DRIVE
3.9
4.7k
3.9
+
50V
8.2k
+
MEGA BASS
4.7
ON : 0.1
2.2k
50V
0.001
OFF : 0.7
+
3.3k
6.8k
4.7
0
50V
+
50V
0.8 (9.5)
1N4148TP
1N4148TP
13.7
6.2
5.6
9.3
9.9
13.5
+
2SD1616-L
+
+
+
+
0.022
+
0.022
50V
10V
Q312
+6V REGULATOR
Q313
+9V REGULATOR
15
15
(Page 19)
DISPLAY
D
BOARD
* CD
* SUPPLIED AS THE
BLOCK
ASSEMBLED BLOCK
9P
9P
2200p
2.7k
2.7k
Q314
MUTING CONTROL
SWITCH
0 [1.1]
0
[0.6]
IC301
+
1N4148TP
POWER AMP
8.7
50V
0
+
16.1
+
+
0 [0.6]
0.6
–
8.7
25V
0
+
50V
2SD1616-L
16V
BIAS CIRCUIT,
HEAT OPERATION
+
PROTECTION CIRCUIT
0
16V
+
0.6
8.7
–
2SD1616-L
+
0
+
16.1
+
0 [0.6]
Q301, 302
16.7
MUTING
50V
16.4
+
0.1
Q308, 309
+9V REGULATOR
1N4148TP
13.7
13.7
13.7
13.7
0.6 (13.6)
13
0.8
(10)
13.6
13.6
(0)
4.7k
(12.9)
0.3
0
(0.7)
+
0.6
(0)
50V
Q305, 306
B+ SWITCH
Q310, 311
REGULATOR CONTROL
SWITCH
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : TUNER (FM/AM)
(
) : CD PLAY
[
] : TAPE PLAY
HCD-E301
HEADPHONE BOARD
1
2
3
4
5
6
7
PHONES
5
1
CN301
5P
+
R
SPK301
–
SPEAKER
IMPEDANCE
–
USE 4
L
+
+
0.15
0.15
+
25V
6
DC_15V
+
E
POWER
BOARD
1N4148TP
CN402
(Page
20)
1
1N4148TP
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