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RXD-501/551/571/A5/701/751/771/A8
QQ
3 7 63 1515 0
6. Input expander IC (parallel-serial)
• X28, IC6 (TC74HC166AP)
Pin No.
Name
1
–
2
–
3
DPSS
4
A-PLAY
5
A-PACK
6
–
7
CD CLK
8
GND
9
–
10
B-PACK
11
B-PLAY
12
R REC
13
PS IN
14
F REC
15
PS LOAD
16
Vcc
7. Key matrix
TE
L 13942296513
FL driver u-COM (uPD780204-038)
• X14, IC1
VOLTAGE (V)
0 ~ 0. 82
0. 84 ~ 1. 64
1. 66 ~ 2. 52
2. 54 ~ 3. 38
3. 40 ~ 4. 18
4. 20 ~ 4. 78
VOLTAGE (V)
0 ~ 0. 82
0. 84 ~ 1. 64
1. 66 ~ 2. 52
2. 54 ~ 3. 38
3. 40 ~ 4. 18
4. 20 ~ 4. 78
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12
CIRCUIT DESCRIPTION
I/O
I
+5V
I
N. C.
I
DECK DPSS DETECTION
I
A DECK PLAY SW
I
A DECK PACK DETECTION
I
GND
I
CD CLOCK INPUT
I
GND
I
+ 5V
I
B DECK PACK DETECTION
I
B DECK PLAY SW
I
REVERSE REC DETECTION
I
PS IN
I
FORWARD REC DETECTION
I
PS LOAD
I
+5V
AD0 (33pin)
POWER
EX. BASS
–
–
–
DISPLAY
–
INPUT
–
MODE / DEMO
–
TIMER
AD4 (29pin)
CD 4
A / B
CD ¢
TAPE ¡
CD 7
TAPE £
CD 6
TAPE 7
CD 0
TAPE ™
TAPE ¶
TAPE 1
x
ao
y
i
8
Description
H = MUSIC
H = NOT PLAY
H = PACK OUT
H = PACK OUT
H = NOT PLAY
H = REC PROHIBITION
H = REC PROHIBITION
Q Q
3
6 7
1 3
AD1 (32pin)
AD2 (31pin)
CD PGM
DUBBING
SRS
SOUND
SET
–
AD5 (28pin)
AD6 (27pin)
DOLBY NR
REV MODE
DISC 1
DISC SKIP
DISC 2
DISC 3
u163
.
2 9
9 4
2 8
L = NO MUSIC
L = PLAY
L = PACK IN
L = PACK IN
L = PLAY
L = REC PERMITTED
L = REC PERMITTED
1 5
0 5
8
2 9
9 4
AD3 (30pin)
TUNING UP
TUNING DOWN
BAND
AUTO
ENTER
–
m
co
9 9
2 8
9 9
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