Read Harman Kardon HK 3470 Service Manual online
2. Pin Description
Pin No.
Pin Name I/O ACTIVE
PORT NAME
REMARK
1
Vdd
-
H
+5V
System power supply
2
P37
I
H
KR4
Key read 4
3
P36
I
H
KR3
Key read 3
4
P35
I
H
KR2
Key read 2
5
P34
I
H
KR1
Key read 1
6
P33
-
-
-
Not used
7
P32
-
-
-
Not used
8
P31
O
H/L
PWR_LED(RED)
L:AMBER L:GREEN H:RED
9
P30
O
H/L
PWR_LED(GRN)
L:STBY H:OPER L:PROT
10
RESET
I
L
System reset
Low reset
11
X2
-
-
OSC
Main system osc.
12
X1
I
-
OSC
-
13
Vpp
-
-
Conneced to Vss
14
XT2
-
-
-
Not used
15
P04/XT1
I
H/L
OPT_RDS
Rds on/off
16
Vdd
-
H
+5V
System power supply
17
P27
-
-
Not used
18
P26
-
-
Not used
19
P25
I
L
PWR DOWN
Detect power off
20
P24
O
H
PWR_RLY
Power Relay on/off
21
P23
O
H
VR_UP
Volume up
22
P22
O
H
VR_DOWN
Volume Down
23
P21
I
L
PROTECT
Detect protection
24
P20
O
H
PWR_MUTE
Power Mute
25
AVss
-
L
GND
Analog ground
26
P17
O
H
PRE_MUTE
Pre mute
27
P16
O
H
TUNER_MUTE
Tuner mute
28
P15
I
H/L
IF_IN
IF conter in
29
P15
O
H
PLL CE
30
P13
O
H
PLL CLOCK
31
P12
O
H/L
PLL DATA
32
P11
I
L
TUNED
Tuned in on : L
33
P10
I
L
STEREO
Stereo in on : L
34
Avdd
-
H
+5V
Analog power supply
35
Avref
-
L
GND
36
P03
-
-
Not used
37
INTP2
I
L
RDS CLK
Rds clock in
38
P01
I
H
RDS DATA
Rds data in
39
P00
I
L
REMOCON IN
Remocon data in
40
Vss
-
L
GND
Ground
41
P74
O
H/L
78211 CLK
42
P73
O
H/L
78211 CE
43
P72
-
-
Not used
44
P71
-
-
Not used
45
P70
-
-
Not used
46 Vdd - H +5V
uPD780204GF QFP Type
HK3370 / HK3470
9
76
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