Sony CDX-454RF - Compact Disc Changer System, Service Manual

Page: 36 / 50

36
CDX-454RF/454XRF
7-12. IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC201 CXP740056-011R (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1 to 3 NC — Not used
4 AMUTE O Audio line muting on/off control signal output “H”: muting on
5 CDXLT O Serial data latch pulse signal output to the DSP
6 CDDATA O Serial data output to the DSP
7 CDCLK O Serial data transfer clock signal output to the DSP
8 CDON O D/A converter and servo section power supply on/off control signal output “H”: power on
9 ELVON O Mechanism deck section power supply on/off control signal output “H”: power on
10 to 35 NC — Not used
36 LCDON O
The LCD in remote commander and FM transmitter section power supply on/off control signal
output “H”: power on
37 LCDCE O Chip enable signal output to the LCD driver in remote commander “H” active
38 RESET I
System reset signal input from the reset switch or reset signal generator “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
39 GND — Ground terminal
40 XTAL O Main system clock output terminal (12 MHz)
41 EXTAL I Main system clock input terminal (12 MHz)
42 TEXTSEL I
CD text mode setting terminal “L”: CD text on, “H”: does not display track name
Not used
43 LCDINH O Inhibit signal output to the LCD driver in remote commander
44 LCDDATA O Serial data output to the LCD driver in remote commander
45 LCDCLK O Serial data transfer clock signal output to the LCD driver in remote commander
46 CFSEL I Custom file on/off setting terminal “L” custom file on Not used
47 EEINIT I Initialize signal input for the EEPROM “H”: format Not used
48 EEDATA I/O Two way data bus with the EEPROM Not used
49 EECLK O Serial data transfer clock signal output to the EEPROM Not used
50 VSS — Ground terminal (for A/D converter)
51 AVREF I Reference voltage (+5V) input terminal (for A/D converter)
52 VDD — Power supply terminal (+5V) (for A/D converter)
53 SINGLE I
Setting terminal for the single disc/multiple discs mode
“L”: single mode, “H”: multiple discs mode Not used
54 LDON O The laser automatic power control on/off signal output “H”: automatic power control on
55 AGCHOLD O RF AGC hold on/off signal output “H”: hold on
56 RF AGC O RF AGC level control signal output “L ”: off, center voltage : 40%, “H”: 60%
57 H.TEMP I High temperature sensor input terminal Not used
58 KEYIN I Key input terminal (A/D input) from the remote commander
59 EHS I Elevator height position detection signal input from the elevator height sensor (A/D input)
60 MCK I
Input of signal for the fine adjustment (elevator height (address) adjustment) of elevator position
(A/D input)
61 NC — Not used
62 ACCIN I Accessory detection signal input “L”: accessory on
63 EJECT I Eject switch input terminal “H” active
64 MAGSW I Magazine in/out detection switch input terminal Not used
65 LOAD1 I
Chucking end detect switch input terminal
“L”: When completion of the disc chucking operation
66 LOAD2 I Save end detect switch input terminal “L”: When completion of the disc save operation
67 to 70 NC — Not used