Sony PMC-MD55 Service Manual page 182

• MAIN BOARD IC405 CXP740096-032Q (SYSTEM CONTROLLER)
Pin No. Pin Name
1 MD
2 RADIO/LINE
3 AC-CHK
4 to 6 NC
7 RDS-DATA
8 NC
9 RDS-CLK
10 CD-TURN
11 M/B
12 CD-OPEN
13 CD-CLOSE
14 to 16 NC
17 MD-H
18 REC-H
19 MD-RST
20 MD-SCTS
21 MD-SRTS
22 MD-PDOWN
23 D/L CON
24 LCD-RST
25 LCD-CE
26 LCD-AO
27 LED-MD
28 LED-RADIO
29 LED-CD
30 NC
31 RADIO-POWER
32 CD-POWER
33 HI-LED
34 CD-12HISP
35 to 38 NC
39 TU-SFT
40 RST
41 VSS
42 XTAL
43 EXTAL
44 SELECT-GND
45 HP-SW
46 LCD-DATA
47 LCD-CLK
48 CD-DOOR
49 JOG-A
50 JOG-B
I/O
O Function select signal output for the MD playback signal "L": MD, "H": other function
Function select signal output for the tuner/line input signal
O
"L": tuner/line in, "H": other function
I AC power supply detection signal input
— Not used (open)
RDS serial data input from the RDS decoder Used for the AEP, UK models
I
(US, Canadian models: not used (fixed at "L"))
— Not used (open)
RDS serial data transfer clock signal input from the RDS decoder Used for the AEP, UK models
I
(US, Canadian models: not used (fixed at "L"))
I CD lid start closing detection signal input
O MEGA BASS on/off control signal output
O CD lid open/close motor (M703) drive signal output
O CD lid open/close motor (M703) drive signal output
— Not used (open)
O MD play control signal output to the A/D, D/A converter (IC603) "L": MD playback mode
O MD rec control signal output to the A/D, D/A converter (IC603) "L": MD recording mode
Power supply on/off control signal output for the MD mechanism controller (IC601)
O
"H": power on
O System controller busy status monitor output to the MD mechanism controller (IC601)
I MD mechanism controller busy status monitor input from the MD mechanism controller (IC601)
O Power down signal output to the MD mechanism controller (IC601) "L": power down
O CD disc illumination lamp (PL550) drive signal output "H": lights up
O Reset signal output to the liquid crystal display (LCD500)
O Chip enable signal output to the liquid crystal display (LCD500)
O Address signal output to the liquid crystal display (LCD500)
LED drive signal output of the fl MD indicator (D550) "H": LED on
O
O LED drive signal output of the BAND TUNER indicator (D552) "H": LED on
LED drive signal output of the fl CD indicator (D551) "H": LED on
O
— Not used (open)
O Tuner system power supply on/off control signal output "L": power on
O
CD servo system power supply on/off control signal output "L": power on
O LED drive signal output of the HIGH SPEED indicator (D555) "H": LED on
O CD spindle motor control signal output
— Not used (open)
O Level shift of the main system clock control terminal
System reset signal input from the reset signal generator (IC404) "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
—
Ground terminal
I Main system clock input terminal (8 MHz)
O Main system clock output terminal (8 MHz)
I Destination setting terminal Fixed at "H" in this set
I Headphone plug in/out detection input "L": plug in
O
Serial data output to the liquid crystal display (LCD500)
O Serial data transfer clock signal output to the liquid crystal display (LCD500)
I
Detection signal input from the CD lid open/close detect switch (S761/762)
I
Jog dial pulse input from the rotary encoder (S556) (A phase input)
I Jog dial pulse input from the rotary encoder (S556) (B phase input)
Description
"L": AC in
"H": start closing
"L": MEGA BASS on
– 112 –
"H": during CD lid open
"H": during CD lid close