R-V251
4
CIRCUIT DESCRIPTION
Active
Pin. No.
Pin Name
I/O
Description
H
L
1,2
G1,G2
O
FL grid control.
3
PULL UP
-
Connected to VCC(+5.0V).
4
POWER DOWN
I
AC selector.
5
VOL. UP
I
Volume encoder A(CW) signal.
6
RDS CLK
I
RDS IC(IC703) clock input control.
7
VOL. DOWN
I
Volume encoder B(CCW) signal.
8
RMC
I
Remote control signal input.
9
RDS DATA
I
RDS IC(IC703) data input control.
10,11
NC
-
Unused.
12
PROTECTION
I
Detection input port of protection.
ON
13
STEREO
I
Detection input port of stereo signal for TUNER.
STEREO
14
PLL CE
O
PLL IC(IC402) CE signal output.
15
RCVR CLK
O
SEL. IC(IC601,602,106) clock signal output.
16
RCVR DATA
O
SEL. IC(IC601,602,106) data signal output.
17~19
KEY3~1
I
Key return 3~1.
20
S. DATA
I/O
Serial communication data.
21
S. BUSY
I/O
Serial communication busy.
22
E.VOL CK
O
E.volume IC(IC107) clock control.
ACTIVE
23
E.VOL DT
O
E.volume IC(IC107) data control.
24
E.VOL ST
O
E.volume IC(IC107) strobe control.
ACTIVE
25
PLL DO
I
PLL IC(IC402) DO signal.
26
RCV CE
I
Receiver chip enable signal.
ENABLE
27
DSP CE
O
DSP IC(IC105) XLAT.
28
AVREF
-
Analog power 5.0V).
29
H/P DETECT
I
Detection input port of headphones jack.
30
SD
I
Detection input port of SD signal for TUNER.
TUNED
31
S. LEVEL
I
A/D input port of signal level.
32
DSP READY
O
DSP IC(IC105) ready.
33
DSP DATA
O
DSP IC(IC105) data.
34
DSP CLK
O
DSP IC(IC105) clock.
35
OPT
I
Discrimination port of model.
E,T
X
36
CH.SPACE
-
Unused.
37
AVSS
-
Analog ground.
38
RESET
I
u-COM reset.
39
EXTAL
I
Main clock(10MHz).
40
XTAL
-
Main clock(10MHz).
41
VSS
-
u-COM ground.
42
TX
-
Sub clock(32.768kHz).
43
TEX
I
Sub clock(32.768kHz).
44
VDD
-
Power 5.0V).
45
VFDP
-
FL power supply(-33V).
46
T. MUTE
O
Muting control of TUNER.
ON
47
MAIN MUTE
O
Muting control of main output.
ON
48
H/P MUTE
O
Muting control of headphones.
ON
49
VCR MUTE
O
VIDEO IC(IC108) control.
ON
50
DSP RESET
O
DSP IC(IC105) reset.
51
RCV. CE
I
Receiver chip enable signal.
52
-
-
Unused.
53
F. RLY
O
Front speaker relay control.
ON
54
S. RLY
O
Surround speaker relay control.
ON
55
C. RLY
O
Center speaker relay control.
ON
1. Microprocessor : (FRONT PCB,IC701)
1-1. Pin description
