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6-5. Schematic Diagram MAIN Section (2/3)
1
2
MAIN BOARD
A
B
(RECORD/PLAYBACK HEAD)
(L-CH)
(R-CH)
C
(ERASE)
D
E
MAIN
6
BOARD
(3/3)
F
0
0.7
2SC945
ISS
0.1
SWITCHING
MAIN
4
BOARD
G
(1/3) (3/3)
MAIN
2
BOARD
(1/3)
MAIN
3
BOARD
(3/3)
H
I
• See page 15 for Waveforms.
• See page 28 for IC Block Diagrams.
3
4
5
(2/3)
IC701
IC702
REC/PB
ALC,
SWITCH
REC,PB AMP
0
0
[1.9]
[1.9]
0.6 [0]
2SC945
0
REC/PB
2SC945
[2.5]
AMP GAIN
SWITCH
0
0
CONTROL
0.0012
0
0.001
0
0
1.3
1.4
3.6
0
IC B/D
7.6
IC B/D
0
[8.9]
0
0
1.3
1.4
3.6
0
7.2
0
0.001
0
0
2SC945
0.6 [0]
9
0.012
2SA733
0
[5.9]
8.9
0
0
[8.2]
[0.1]
[8.8]
2
8.9 [0]
0
2SC945
Q716, 717
[0.1]
2SC945
BAIS
REC BIAS
OSC
0
[0.7]
0.1
7.8
7.8
4.7
4.7
4.2
4.2
2SC945
REC AMP
2SC945
3.3k
3.3k
REC AMP
6
7
8
2SC945
REC/PB
0
SWITCH
[0.1]
0 [0.1]
0
[0.7]
Q707, 708
MUTING
3.3k
0 [0.7]
0.6 [0]
0
0
0
2SC945
ALC
10 50v
CONTROL
0 [0.7]
7.3
0
2SC945
3.3k
Q702, 706
Q704
AMP GAIN
REC/PB
SWITCH
CONTROL
0 [0.1]
0 [0.1]
0 [1.9]
0 [1.9]
2SC945
0 [0.7]
2SC945
0 [2.5]
8.4 [0.1]
2SC945
AMP
0
[0.7]
100
16V
3.9
3.7
2SC945
2SC945
1.3
1.3
PB AMP
PB AMP
0.7
0.7
21
21
9
10
11
11.9
11.9
11.8
2SB926
11.8
2SB926
0
0
Q720,721
CAPSTAN/REEL
MOTER DRIVE
0.022
11.8
2SC945
0
Q722,723
TRIGGER
PLUNGER DRIVE
0.1
11.8
2SC945
0
1SS133
0.1
0.1
No mark : FM
[
] : REC
HCD-EP404
12
13
(CAPSTAN/REEL)
M
TAPE PLAY
DETECT SENSOR
(HALF)
(MODE)
(TRIGGER PLUNGER)
(PROTECT(FWD))
C
TO
DISPLAY
BOARD
(Page 24)
D
TO
DISPLAY
BOARD
(Page 24)
1
MAIN
BOARD
(1/3)
5
MAIN
BOARD
(1/3)
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