Read Sony CDX-CA720X Service Manual online
13
CDX-CA720X
3-1. IC PIN DESCRIPTION
• IC501 MN101C49KCY2 (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
VREF–
—
Ground for A/D converter power supply
2
VSM
I
S-meter voltage detection signal input from tuner unit (TU10)
3
NIL
I
Connect to ground.
4
KEYIN1
I
Key signal input
5
KEYIN0
I
Key signal input
6
RC IN0
I
Rotary commander key signal input from remote in jack (J561)
7
QUALITY
I
Noise detection signal input Connect to ground in this set.
8
NIL/MPTH
I
Connect to ground in this set. Multi path detection signal input
9
DSTSEL/FUNCSEL
I
Destination set up detection signal input
10
VREF
—
A/D converter power supply
11
VDD
—
Power supply (+5 V) input pin
12
OSCOUT
O
High speed clock signal output (18.432 MHz)
13
OSCIN
I
High speed clock signal input (18.432 MHz)
14
VSS
—
Ground for power supply
15
XIN
I
Low speed clock signal input (32.768 kHz)
16
XOUT
O
Low speed clock signal output (32.768 kHz)
17
MMOD
I
Memory mode select signal input (Input to “Low” (single chip mode).)
(Connect to ground.)
18
LCDSO
O
LCD serial data signal output to LCD driver (IC901)
19
LCDCE
O
LCD chip enable signal output to LCD driver (IC901)
20
LCDCKO
O
LCD serial clock signal output to LCD driver (IC901)
21
CD TSO
O
CD servo IC serial data signal output
22
CD TSI
I
CD servo IC serial data signal input
23
CD TCKO
O
CD servo IC serial clock signal output
24
SYSRST
O
System reset signal output to bus interface (IC581)
25
BUS ON
O
Bus on signal output to bus interface (IC581)
26
KEYACK
I
Key acknowledge detection signal input
27
NIL/DAVN
I
Connect to ground in this set. RDS data block synchronization detection signal input
28
BU IN
I
Back up power supply detection signal input
29
SIRCS
I
Remote signal input from remote control receiver (IC971)
30
CD SELFSW
I
CD mechanism self load position detection switch signal input from self switch (SW2)
31
CD PACK
I
CD text pack sync signal input from CD servo (IC1)
32
VDD2
—
Power supply (+5 V) pin
33
RESET
I
microcomputer reset signal input from reset IC (IC551) “L”: reset
34
NOSE SW
I
Front panel attachment detection signal input from nose detect switch (S552) “L”: ON
35
BEEP
O
Beep signal output to power amp (IC751)
36
NCO
O
Not used. (Open)
37
TESTIN
I
Test mode detection signal input
38
ACCIN
I
Accessory power supply detection signal input
39
NCO (VCC)
O
Not used. (Open)
40
TELATT
I
Telephone ATT detection signal input
41
NCO (VCC)
I
Connect to power supply.
42
UNISO
O
Sony-Bus serial data signal output to bus interface (IC581)
43
UNISI
I
Sony-Bus serial data signal input from bus interface (IC581)
44
UNICKO
O
Sony-Bus serial clock signal output to bus interface (IC581)
45
I2C SIO
I/O
I2C bus serial data signal input/output
46
NCO
O
Not used. (Open)
47
I2C CKO
O
I2C bus serial clock signal output
48
NCO
O
Not used. (Open)
SECTION 3
DIAGRAMS
Ver 1.1
Click on the first or last page to see other CDX-CA720X service manuals if exist.