Sony PMC-MD55 - Md Boombox, Service Manual

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DG BOARD IC601 RU8X12MF-0031 (MD MECHANISM CONTROLLER)
Pin No. Pin Name I/O Description
1, 2
DAOUT0, DAOUT1 O Not used (open)
3 to5 KEY0 to KEY2
I Key input terminal (A/D input) Not used (fixed at “H”)
6 CHACK-IN
I
Detection input from the disc chucking-in detect switch “L”: chucking
Not used (fixed at “H”)
7 PACK-IN I
Detection input from the loading-in detect switch
“L” at a load-out position, others: “H” Not used (fixed at “H”)
8 PACK-OUT I
Detection input from the loading-out detect switch (S602)
“L” at a load-out position, others: “H”
9, 10 NC
— Not used (fixed at “L”)
11 AVSS
— Ground terminal
12 XINT I Interrupt status input from the CXD2654R (IC121)
13 PDOWN I Power down detection signal input terminal “L”: power down, normally: “H”
14 NC — Not used (fixed at “L”)
15 SQSY I
Subcode Q sync (SCOR) input from the CXD2654R (IC121)
“L” is input every 13.3 msec Almost all, “H” is input
16 DQSY I
Digital In U-bit CD format subcode Q sync (SCOR) input from the CXD2654R (IC121)
“L” is input every 13.3 msec Almost all, “H” is input
17 to 19 NC — Not used (fixed at “L”)
20 SYS-RST
I
System reset signal input from the reset switch (Q604) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
21 TEST I Setting terminal for the test mode Not used (fixed at “L”)
22 +3.3V — Power supply terminal (+3.3V)
23 VBAT I Power supply for the internal real time clock and RAM
24 XOUT-T O Sub system clock output terminal (32.768 kHz)
25 XIN-T I Sub system clock input terminal (32.768 kHz)
26 GND — Ground terminal
27 XOUT O Main system clock output terminal (12 MHz)
28 XIN I Main system clock input terminal (12 MHz)
29 EXMEM
I
Setting terminal external ROM mode or internal ROM mode “L”: internal ROM mode
(fixed at “L”)
30 S1
— Not used (open)
31 NC
— Not used (fixed at “L”)
32 SENS
I Internal status (SENSE) input from the CXD2654R (IC121)
33 SHOCK I
Track jump detection signal input from the CXD2654R (IC121)
34 to 35 NC
— Not used (fixed at “L”)
36 STB O
Relay drive signal output for the power on/off “L”: standby mode, “H”: relay on
37 REC P I
Detection input from the recording position detect switch (S601) “L” active
38 PB P I
Detection input from the playback position detect switch (S604) “L” active
39 LD-LOW
O
Loading motor drive voltage control signal output for the loading motor driver (IC602)
“H” active
40 NC
— Not used (open)
41 MNT2 (XBUSY) I
Busy status signal input from the CXD2654R (IC121)
42 MNT3 (SLOCK) I
Spindle servo lock status monitor signal input from the CXD2654R (IC121)
43
LED0 O LED drive signal output terminal “L”: LED on Not used (open)
44 to 45 NC
— Not used (fixed at “L”)
46 RST-LOW
— Not used (open)
47 GND
— Ground terminal