Sony CDX-L250 - Fm/am Compact Disc Player, Service Manual

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CDX-L250/L430X
4-1. IC PIN DESCRIPTION
• IC801 µPD780024AGK-B26-9ET (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Pin Description
1 D SW I Down switch detection input
2 IN SW I Disc in switch detection input
3 PH3 I PH3 detection input (Not used in this set)
4 LM LD O Loading motor drive output (Loading)
5 LM EJ O Loading motor drive output (Eject)
6 A ATT O Power amplifier mute control output
7 ATT O Line out mute control output
8 BEEP O BEEP output
9 VSSO — Ground
10 VDDO — Power supply pin (+5 V)
11 VOL CLK O Electric volume clock output
12 VOL DO O Electric volume data out output
13 VOL CE O Electric volume chip enable output
14 AM ON O Tuner AM power supply control output
15 FM ON O Tuner FM power supply control output
16 NOSE I Front panel attachment detection input
17 PLL DI I PLL IC data input
18 LCD DO O LCD data output
19 LCD CE O LCD chip enable output
20 LCD CLK O LCD clock output
21 PLL CLK O PLL IC clock output
22 PLL DO O PLL IC data output
23 PLL CE O PLL IC chip enable output
24 VDD1 — Power supply pin (+5 V)
25 AVSS — Ground
26 ST IND I FM STEREO detection input
27 FUN SEL I Function select input
28 S METER I S meter signal input
29, 30 KEY0, 1 I A/D key input 0, 1
31 TEL ATT I Attenuator signal input
32 DST SEL I Destination select input
33 TEST I Force test mode input
34 AVREF — A/D converter power supply pin (+5 V)
35 AVDD — A/D converter power supply pin (+5 V)
36 RESET I Reset input
37 XT2 O Sub clock output (32.768 kHz)
38 XT1 I Sub clock input (32.768 kHz)
39 IC — Connect to Ground in this set.
40 X2 O Master clock output (8.38 MHz)
41 X1 I Master clock input (8.38 MHz)
42 VSS1 — Ground
43 KEY ACK I Key acknowledge detection input
44 SIRCS I SIRCS input
45 SELF SW I Self switch detection input
46 BU IN I Backup power supply detection input
47 AD ON O Key power supply control output
48 ILL ON O Illumination power supply control output
49 AMP ON O Amplifier remote power supply control output
50 CDM ON O CD mechanism deck power supply control output
51 XCD ON O CD DSP IC 16 MHz X’tal ON/OFF control output
52 TU ON O Tuner power supply control output
SECTION 4
DIAGRAMS
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