Printed Wiring Board Cassette Section; Schematic Diagram Cassette Section - Sony HCD-EP303 Service Manual

HCD-EP303

6-6. Printed Wiring Board CASSETTE Section

1 2
CASSETTE BOARD
E
A
1
HPRE701
REC/PB ERASE
2
HEAD
B
3
4
5
6
E
C
SW701
(REC/PB)
REC
PB
• Semiconductor
Location
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
• See page 16 for Circuit Boards Location.
3 4 5
E
A
K
IC701
K
E
A
E

6-7. Schematic Diagram CASSETTE Section

• See page 17 for Waveforms.
• See page 30 for IC Block Diagrams.
CASSETTE BOARD
SW701 (4/6)
(REC/PB)
REC
R
HRPE701 PB
(REC/PB ERASE HEAD)
15k
L-CH (REC/PB)
MAIN BOARD
B
CN201
0.0018
(Page 21)
CN701
4P
0.0015
0.0015
R-CH (REC/PB)
15k
0.0018
(ERASE)
SW701 (2/6)
(REC/PB)
REC
r
PB
SW701 (3/6)
(REC/PB)
REC t PB
24 24
82k
82k
SW701 (5/6)
(REC/PB)
IC701
REC
0.1
5.6k
r ALC, REC/PB AMP
+
PB
1.2k
IC B/D
Q701, 702
50V
MUTING
2SC945
+ +
50V
+
50V
0.6
0.1
1.4 0 0
IN1 NF1 PC1 OUT1 ALC ALC GND
IN1 CONST
ALC
0.022
IN2 NF2 PC2 OUT2 IN2 RF VCC 0.6
0
0 1.2 0 8.1
+
1.4
+ 0.1
+
+
50V 2SC945
50V
1N4148TP
+
+
SW701 (1/6)
1.2k
25V
(REC/PB)
REC
50V
R 1N4148TP
0.1
5.6k
PB
100k
2SC945
Q706
330
0.0027 REC BIAS OSC
2
CONTROL
9.7
3.6
0.0068 2SD1616-L Q703
9.7
0
2SC945
9.3
MUTING
CONTROL
+
SWITCH
0.022 50V
0.022
SW701 (6/6)
(REC/PB)
REC T PB
50V
+
+
50V
B
MAIN
BOARD
(2/2)
CN201
(Page 23)
0
0
0
0
Q704
2SC945
MUTING
SWITCH
No mark:FM