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Microcomputer's Terminal Description - Kenwood KDC-2021SA Service Manual

Kenwood cd receiver service manual

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MICROCOMPUTER'S TERMINAL DESCRIPTION

SYSTEM MICROCOMPUTER uPD780058GC-XXX (IC1:X25)
Pin No.
Pin Name
1
PANEL
2
8EJE SW *1
3
NC
4
AVss
5
L-RST
6
L-CE
7
AVREF1
8
NC
9
PLL-DATA
10
PLL-CLK
11
L-DATAL
12
L-DATAS
13
L-CLK
14
R-DATA
15
R-QUAL
16
CH-DATAC
17
CH-DATAH
18
CH-CLK
19
CH-REQH
TE
L 13942296513
20
PLL-CE
21
AFS
22
LO/DX
23~26
NC
27
SD
28
CH-CONT
29
TYPE REF
30
TYPE2
31
TYPE1
32
TYPE0
33
Vss1
34
IC2TYPE1
35
IC2TYPE0
36
DATA
37
CLK
38
MUTE
39
P-MUTE
40
SVR
41
P-STBY
42
SW5V
www
43
B.U-DET
44
ACC-DET
45,46
NC
.
47~49
PS1-0~PS1-2
50
BEEP
51,52
PS2-0,PS2-1
53
DSI
I/O
Purpose
I
Panel detection
I
8 cm disk eject end detection switch
O
Not used
-
GND potential (for A/D and D/A)
O
LCD driver reset
O
LCD driver chip enable
I
5V power supply (D/A converter reference voltage)
I
Not used
I/O
F/E (IC3) communication data
O
F/R (IC3) communication clock
I
LCD driver communication data (LCD)
O
LCD driver communication data (SYSTEM)
O
LCD driver communication clock
I
RDS DATA
I
RDS QUAL
I
5-wire communication data (CH)
O
5-wire communication data (HEAD)
I/O
5-wire communication clock
O
5-wire CH request (HEAD)
O
F/E chip enable
O
Noise detection time constant switching
O
Local seek switching
O
Not used
I
Station detection
O
5-wire communication CH ON output
O
Destination type and servicing setting 5V output
I
Destination type setting
I
Destination type setting
I
Destination type setting
-
GND potential (for other parts than ports and analog circuitry) -
I
Servicing pin (SEL1), normally "L"
I
Servicing pin (SEL0), normally "L"
I/O
IC2, CD mechanism and F/E communication data
O
IC2, CD mechanism and F/E communication clock
O
Muting control output
O
PWR IC muting output
O
SVR control output
O
PWR IC standby output
O
SW5 control output
I
B.U. detection
I
ACC detection
x
ao
y
O
Not used
i
O
Power supply IC AUD/P.CON/P.ANT SW
O
Buzzer output
O
Power supply IC ILL/AM/FM SW
O
DSI control output
8
Hi-Z
L, L when the 8 cm CD compatibility is not provided.
L
-
H, L when the panel is detached or with 7-segment output.
L, L is output when the panel is detached.
-
Hi-Z
L
L
Hi-Z
L, L is output when the panel is detached.
H, L is output when the panel is detached.
Hi-Z, L when RDS is not available.
Hi-Z, L when RDS is not available.
Hi-Z, L when CH is not available.
L, L when CH is not available.
Hi-Z, L when CH is not available.
Q Q
H, L when CH is not available.
3
6 7
1 3
L
L
L
L
Hi-Z
L, L when CH is not available.
L
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
L
L
L, 15 sec. after power OFF.
H, 15 sec. after power OFF.
L
L
"H" in 10 sec. after power OFF.
Hi-Z
Hi-Z
u163
L
.
L
L
L
L, H/L when panel is detached. FIX output is L.
KDC-2021SA/SG
2 9
9 4
2 8
Processing in STBY Mode
1 5
0 5
8
2 9
9 4
m
co
9 9
2 8
9 9
3

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