Read Sony CMT-EP30 / CMT-EP40 / HCD-EP30 / HCD-EP40 Service Manual online
HCD-EP30/EP40
19
19
6-5.
PRINTED WIRING BOARD – CASSETTE Board –
•
See page 15 for Circuit Boards Location.
6-6.
SCHEMATIC DIAGRAM – CASSETTE Board –
•
See page 23 for Waveforms.
•
See page 24 for IC Block Diagram.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : TAPE PLAY
(
no mark : TAPE PLAY
(
) : RECORD (ISS 1)
[
] : RECORD (ISS 2)
IC701
+
A
K
+
+
+
+
+
+
+
+
+
+
+
BC
E
EC
B
EC
B
BC
E
EC
B
E C B
+
A
K
HPRE701
REC/PB/ERASE
HEAD
–1
–2
–3
–4
–5
–6
SW701
(REC/PB)
REC
PB
CASSETTE BOARD
B
MAIN BOARD
CN201
A
B
C
1
2
3
4
5
• 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
Q705
B-2
Q706
C-2
1
2
3
3
MAIN
BOARD
(2/2)
CN201
B
IC B/D
0
1.2
1.4
3.9
0
0
7.8
7.7
0
3.9
1.4
1.2
0
0 (0.7)
0
0 (0.7)
0
0
(3.5)
(3.5)
0.7 (0)
0.7
0
9.3 (0.8)
9.3 (0.8)
8.9 (0.3)
0.4 (0)
[21.4]
[21.4]
0 (0.7)[0]
R-CH
L-CH
ERASE
HRPE701
RECORDE/PLAYBACK
ERASE
CN701
4P
0.0015
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
Q705
ISS SWITCHING
0.0027
0.022
0.022
+
50V
0.022
0.0068
Q706
REC BIAS OSC
SW701 (6/6)
(REC/PB)
REC T PB
MUTING
CONTROL
SWITCH
Q704
REC ON SWITCH
25V
+
1SS133T
-77
+
+
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
+
+
CASSETE BOARD
0.0018
0.0018
330
2SD1616-L
50V
100k
1N4148TP
4.7k
(Page 18)
(Page 17)
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