6-8. Ic Pin Function Description - Sony ICF-CD873 Service Manual

6-8. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC401 µPD753012AGC-F17-3B9 (SYSTEM CONTROLLER)
Pin No. Pin Name
1 to 10 SEG12 to SEG21
11, 12 SEG22, SEG23
13 to 16 KS0 to KS3
17 VERSION1
18 VERSION2
19 ALARM
20 BASS ON
21 to 23 COM0 to COM2
24 COM3
25 BIAS
26 to 28 VLC0 to VLC2
29 CD ADJ
30 CLOCK
31 XLT
32 DATA
33 VSS
34 X-RESET
35 POWER ON
36 CD ON
37 R-LAT
38 AC IN
39 CK
40 DATA
41 SQSI
42 SENS
43 CIN
44 SCOR
45 AUTO/MANU
46 DATA
47 CLK
48 LAT
49 BUZZER
50 V-RESET
51 NAR
52 V MUTE
I/O
O Segment drive signal output to the liquid crystal display (LCD401)
O Segment drive signal output terminal Not used (open)
O Key strobe signal output to the key matrix
O Initialize destination output terminal
O Initialize destination output terminal Not used (open)
O Alarm data output terminal Used for the US model only
Mega bass on/off selection signal output to the mega bass power amplifier (IC351)
O
"L": mega bass on
O Common drive signal output to the liquid crystal display (LCD401)
O Common drive signal output terminal Not used (open)
O Bias output for the liquid crystal display drive
— Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
At initial mode: Setting terminal for the test mode (manual mode) "L": manual mode
I/O
At normal mode: E-F balance control signal output to the CXA1782BQ (IC501) "H" active
O Serial data transfer clock signal output to the CXD2508AQ (IC502)
O Serial data latch pulse signal output to the CXD2508AQ (IC502)
O Serial data output to the CXD2508AQ (IC502)
— Ground terminal
System reset signal output to the CXA1782BQ (IC501), CXD2508AQ (IC502) and BA6196FP
O
(IC503) "L": reset
O Front side speaker on/off selection signal output terminal "L": speaker on
At initial mode: Setting terminal for the test mode (auto mode) "L": auto mode
I/O At normal mode: Power on/off control signal output for the CD +5V power supply
"L": CD power on
O PLL serial data latch pulse signal output to the FM/AM PLL (IC50)
I Power failure detection input terminal "L": power failure, "H": power on
At CD mode: Subcode Q data reading clock signal output to the CXD2508AQ (IC502)
O
At tuner mode: PLL serial data transfer clock signal output to the FM/AM PLL (IC50)
O PLL serial data output to the FM/AM PLL (IC50)
I Subcode Q data (80 bit serial) input from the CXD2508AQ (IC502)
I Internal status signal (sense signal) input from the CXD2508AQ (IC502)
I Track jump count detect signal input from the CXA1782BQ (IC501)
I Subcode sync (S0+S1) detection signal input from the CXD2508AQ (IC502)
Setting terminal for the CD adjustment mode (auto mode/manual mode)
I
"L": auto mode, "H": manual mode (fixed at "L")
Serial data output to the CSV (Computer Sound Voice) processor (IC601)
O
Used for the US model only Except US model: Not used (open)
Serial data transfer clock signal output to the CSV (Computer Sound Voice) processor (IC601)
O
Used for the US model only Except US model: Not used (open)
Serial data latch pulse signal output to the CSV (Computer Sound Voice) processor (IC601)
O
Used for the US model only Except US model: Not used (open)
O Buzzer sound drive signal output terminal
Reset signal output to the CSV (Computer Sound Voice) processor (IC601) "L": reset
O
Used for the US model only Except US model: Not used (open)
"H" is input when CSV (Computer Sound Voice) processor (IC601) sends data
I
Used for the US model only Except US model: Not used (open)
O Voice muting on/off selection signal output terminal "H": muting on
Description
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