Sony HCD-EX770 Service Manual page 130

MAIN BOARD IC401
Pin No. Pin Name I / O
1 DAOUT0 O
2 DAOUT1 O
3 KEY0 I
4 KEY1 I
5 KEY2 I
6 CHACK-IN I
7 PACK-IN I
8 PACK-OUT I
9 I
TIMER
10 I
NC
11 AVSS
—
12 XINT
I
13 PDOWN
I
14
NC —
15 SQSY
I
16 DQSY
I
17
NC —
18
NC —
19
NC —
20 SYS-RST I
21 TEST
I
22 +3.3V
—
23 BACK
I
24 XOUT-T
O
25 XIN-T
I
26 GND
—
27 XOUT
O
28 XIN
I
29 GND
—
30 S1 O
31 O
DOSEL
32 SENS
I
33 SHOCK I
34
NC —
35 O
CD/VIDEO
36 STB O
37 REC-P I
38 PB-P I
RU8X12MF-0010 (SYSTEM CONTROLLER)
Output terminal for the test
Output terminal for the test
Key input terminal (A/D input)
fl, ), 0, p, ENTER/YES, EDIT/NO keys input (S701 to S706)
Key input terminal (A/D input)
§ EJECT, PROGRAM, SHUFFLE, CONTINUE keys input (S711 to S714)
Key input terminal (A/D input)
SCROLL, DISPLAY/CHARACTER, REPEAT, CD SYNC, r REC keys input (S722 to S726)
Detection input from the disc chucking-in detect switch (S685)
Detection input from the disc detect switch
Detection input from the loading-out detect switch (S686)
Power switch (S408) input
Not used (fixed at "L")
Ground terminal
Interrupt status input from the CXD2650R (IC121)
Power down detection signal input from the regulated power supply IC (IC501)
"L": power down, normally: "H"
Not used (connected to AUBK (pin %ª) in this set)
Subcode Q sync (SCOR) input from the CXD2650R (IC121)
"L" is input every 13.3 msec
Digital In U-bit CD format subcode Q sync (SCOR) input from the CXD2650R (IC121)
"L" is input every 13.3 msec
Not used (open)
System reset signal input from the regulated power supply IC (IC501)
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
Input terminal for the test Fixed at "L" in this set
Power supply terminal (+3.3V)
Power supply terminal for the backup (for internal RAM)
Sub system clock output terminal (32.768 kHz)
Sub system clock input terminal (32.768 kHz)
Ground terminal
Main system clock output terminal (12 MHz)
Main system clock input terminal (12 MHz)
Ground terminal
System clock output terminal
Not used (open)
Internal status (SENSE) input from the CXD2650R (IC121)
Track jump detection signal input from the CXD2650R (IC121)
Not used (open)
Selection signal output terminal for the optical-in signal (CD/VIDEO)
Strobe signal output to the regulated power supply IC (IC501)
"H": power on, "L": standby mode
Detection input from the recording position detect switch (S688)
Detection input from the playback position detect switch (S687)
Function
C1 is output when test mode
ADER is output when test mode
Not used (fixed at "H")
(for service)
Almost all, "H" is input
Almost all, "H" is input
Not used (open)
– 65 –
"L": chucking
"L" at a load-out position, others: "H"
"L": reset
"L": CD, "H": VIDEO
"L" active
"L" active