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1
CASSETTE
MECHANISM
(D40-1618-05)
A-HEAD
WH2
1
Lch
L-PLAY
2
COM
R-PLAY
Rch
3
2
WH3
L-PLAY
3
B-HEAD
1
Lch
2
3
Rch
4
L-REC
5
ERASE
6
R-REC
R-PLAY
GND
TE
ERASE
L 13942296513
4
5
B
A
MTR
6
+
www
The DC voltage is an actual reading measured with a high impedance type voltmeter with a cas-
7
sette loaded at playback mode. The measurement value may vary depending on the measuring
instruments used or on the product. Bias circuit DC voltage is measured while in the record mode.
AA
RECORD/PLAYBACK UNIT (X28-298X-XX)
CAUTION: For continued safety, replace safety critical compo-
nents only with manufacturer's recommended parts (refer to parts
list).
indicates safety critical components. For continued pro-
tection against risk of fire, replace only with same type and rating
fuse(s). To reduce the risk of electric shock, leakage-current or
resistance measurements shall be carried out (exposed parts are
E2
acceptably insulated from the supply circuit) before the appliance
is returned to the customer.
DOLBY and the double-D symbol are trademarks of Dolby Labo-
ratories Licensing Corporation. Noise reduction circuit made
under license from Dolby Laboratories Licensing Corporation.
1
2
3
IC3
PLAY/REC
HEAD SW
E1
1
2
3
4
Lch
5
6
R63
5.6K
Q13
Q15
R64
5.6K
Q14
Q16
BEAT
CANCEL
CONTROL
C
1
A
2
B
3
PLAY SW1
4
+5V
5
COLLECTOR 1
6
MTR +
SOL
7
SOL 1
SOL
8
SOL 2
9
R-REC
10
COLLECTOR 2
11
PACK 1
12
PLAY SW2
13
COM
14
PACK 2
x
ao
15
F-REC
16
CrO2 1
17
CrO2 2
.
i
AB
12.2V
C51 10u16
+
+
L1 10mH
C33 220P
L2 10mH
C34 220P
Rch
R/P
Q Q
Q21
CONTROL
3
6 7
BIAS
CURRENT
8.9V
10 1/4W
+B
Q12
L5
Q11
+
BIAS OSC
SENSOR OUT B
SENSOR OUT A
u163
y
AC
2 9
9 4
8
Q23,24,28,29
A PB VR
ON/OFF CONTROL
Q25-27
B PB VR
ON/OFF COMTROL
+
IC1
12.3V
R35
C31
15K
10u16
+
R36
C32
15K
10u16
+
1 3
1 5
0 5
8
2 9
Q22
+12V
+12V
+B
+B
R55
9.3V
+12V
Q1
BIAS AVR
REC:
D4
9.9V
+
NOR: 4.7V
CN3
MTR SPEED A
1
A/B
R73
TAPE SPEED
16K
MTR SPEED B
2
VR5 4.7K
B PLAY SW
3
+5V
4
+5V
5
MTR+
6
B SOL
7
A SOL
8
R.REC
9
12
10
B PACK
11
11
A PLAY SW
12
10
m
GND
13
A SOL
CONTROL
co
A PACK
14
5
.
F REC
15
4
B CrO2
16
3
A CrO2
17
2
AD
2 8
9 9
+
+
+
+
+
IC1
PLAYBACK/REC
EQ.
5.7V
+
9 4
2 8
9 9
Q2
Q3
Q8
Q6
R76
R74
47K
47K
Q7
Q5
B SOL
CONTROL
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