Diagrams; Ic Pin Description - Sony CDX-4250 Service Manual

4-1. IC PIN DESCRIPTION

• IC801 µPD17705GC-534-3B9 (SYSTEM CONTROL)
Pin No. Pin Name
1 SIRCS
2 IN-SW
3 D-SW
4 SELF-SW
5 L-SW
6 LM-EJ
7 LM-LOD
8 AMP/ANT-ON
9 MONO
10 SD
11 BAND-SW
12 AREA1-SW
13 AREA2-SW
14, 15 RE1, 2
16 SEEK
17 CD-ON
18 FM-ON
19 TU-ON
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 VDD2
31 VCOH-FM
32 VCOL-AM
33 GND2
34 NC
35 EO1-PDOUT
36 TESTO
37 AM-ON(TU-ON)
38 FM-ON(FM/AM)
39 LCL/DX
40 BEEP
41 ACC-IN
42 SCOR
43 MUTE
44 AMP-MUTE
45 TEL-MUTE
46 NC
47 VOL-CE
48 VOL-CLK
49 VOL-DATA
50 EMPHO
51 PW-ON
52 MD-ON
53 CD-ON
SECTION 4

DIAGRAMS

I/O
I SIRCS input (A/D)
I CD mechanism position detection
I CD mechanism position detection
I CD mechanism position detection
I LIMIT switch
O Loading motor control (Eject direction)
O Loading motor control (Loading direction)
O Power control for amplifier.
O Force MONO output
I SD signal input
I Initialize switch input terminal
I Initialize switch input terminal
I Initialize switch input terminal
I Rotary encoder input 1, 2
O SEEK output
I/O Servo drive power
I/O FM select output
I/O AM select output
— Not used.
— Ground
I Not used (Connect to ground)
I A/D key input 2, 1
I Rotary commander input
I FM and AM common signal meter A/D conversion input
I TEST mode select input
I AM center frequency input
I FM center frequency input
— Power supply (+5 V)
I Local oscillation frequency input (FM)
I Local oscillation frequency input (AM)
— Ground
— Not used.
O Error out output
— Connect to ground
O AM power output (AM select)
O FM power output (FM select)
O LOCAL/DX select ("H" : LOCAL, "L" : DX)
O BEEP output
I Accessory input
I SUBQ data read request
O System mute output
O Power amplifier mute output
O Telephone mute output
— Fixed at "H" in this set.
O Electric volume chip select
O Electric volume serial clock
O Electric volume serial data
O De-emphasis control output
O System power control
O Loading motor power
O Servo drive power
– 19 –
Pin Description