Sony CDX-MP450X Service Manual page 20

CDX-MP450X
• IC801 µPD17708GC-618-3B9 (SYSTEM CONTROL)
Pin No. Pin Name
1 SIRCS
2 SELF SW
3 DOOR
4 NOSE
5 NC
6 SYSRST
7 DOOR IND
8 MUTE
9, 10 NC
11 BAND-SW
12 AREA1-SW
13 AREA2-SW
14 NC
15 PARK
16 TEL MUTE
17 POWER IC ON
18 SEEK
19 AMP MUTE
20 NC
21 GND3
22 KEYIN3
23, 24 KEYIN2, 1
25 ROT-IN
26 S-METER
27 TEST-SW
28 AM IFC
29 FM IFC
30 VDD
31 VCOH FM
32 VCOL AM
33 GND1
34 NC
35 EO1 PDOUT
36 TEST0
37, 38 NC
39 LCL/DX
40 BEEP
41 ACC IN
42, 43 RE1, 2
44 NC
45 MONO
46 SD
47 VOL CE
48 VOL CLK
49 VOL DATA
50 NC
51 FM ON
52 AM ON
53 LCD CE
54 ILL ON
55 NC
56, 57 NC
20
I/O
I Wireless remote commander input
I Self switch input
I Front panel open/close detection input
I Front panel with/without detection input
— Not used. (Connect to ground)
O Reset output for slave microcomputer IC.
O CD door open/close detection output
O Mute on/off control output
— Not used. (Open)
I Initial setting switch input (Fixed at H in this set)
I Destination check input 1 (Fixed at L in this set)
I Destination check input 2 (Fixed at H in this set)
— Not used. (Open)
I Parking signal detection input
I Attenuator on/off control input
O Power supply control output to power amplifier IC.
O SEEK output
O Output control to power amplifier IC.
— Not used. (Open)
— Ground
I Key input of A/D converter (Fixed at L in this set)
I Key input of A/D converter.
I Rotary commander A/D value input
I S-meter input
I Initial setting switch input (Fixed at H in this set)
I AM center frequency counter input
I FM center frequency counter input
— Power supply pin
I FM input at VCO is FM.
I AM input at VCO is AM.
— Ground
— Not used. (Open)
O Error out output
I Fixed at L in this set.
— Not used. (Open)
O LOCAL/DX select output
O Beep output
I Accessory input (L: ACC)
I Rotary encoder input 1, 2
— Not used. (Open)
O Monaural output (H: Monaural, L: Stereo)
I SD input
O Chip enable output for Electric volume IC.
O Clock output for Electric volume IC.
O Data output for Electric volume IC.
— Not used. (Open)
O FM system power control output (H: FM ON)
O AM system power control output (H: AM ON)
O Chip enable output for LCD driver IC.
O Front panel backlight control output (H: Illumination ON)
— Not used. (Connect to ground)
— Not used. (Open)
Pin Description