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MAIN BOARD IC401 RU8X12MF-0010 (SYSTEM CONTROLLER)
Pin No. Pin Name
I / O
Function
1
DAOUT0
O
Output terminal for the test C1 is output when test mode
2
DAOUT1
O
Output terminal for the test ADER is output when test mode
3
KEY0
I
Key input terminal (A/D input)
fl
,
)
,
0
,
p
, ENTER/YES, EDIT/NO keys input (S701 to S706)
4
KEY1
I
Key input terminal (A/D input)
§
EJECT, PROGRAM, SHUFFLE, CONTINUE keys input (S711 to S714)
5
KEY2
I
Key input terminal (A/D input)
SCROLL, DISPLAY/CHARACTER, REPEAT, CD SYNC,
r
REC keys input (S722 to S726)
6
CHACK-IN
I
Detection input from the disc chucking-in detect switch (S685) “L”: chucking
7
PACK-IN
I
Detection input from the disc detect switch Not used (fixed at “H”)
8
PACK-OUT
I
Detection input from the loading-out detect switch (S686) “L” at a load-out position, others: “H”
9
TIMER
I
Power switch (S408) input (for service)
10
NC
I
Not used (fixed at “L”)
11
AVSS
—
Ground terminal
12
XINT
I
Interrupt status input from the CXD2650R (IC121)
13
PDOWN
I
Power down detection signal input from the regulated power supply IC (IC501)
“L”: power down, normally: “H”
14
NC
—
Not used (connected to AUBK (pin
%ª
) in this set)
15
SQSY
I
Subcode Q sync (SCOR) input from the CXD2650R (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 CXD2650R (IC121)
“L” is input every 13.3 msec Almost all, “H” is input
17
NC
—
18
NC
—
Not used (open)
19
NC
—
20
SYS-RST
I
System reset signal input from the regulated power supply IC (IC501) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
21
TEST
I
Input terminal for the test Fixed at “L” in this set
22
+3.3V
—
Power supply terminal (+3.3V)
23
BACK
I
Power supply terminal for the backup (for internal 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
GND
—
Ground terminal
30
S1
O
System clock output terminal Not used (open)
31
DOSEL
O
Not used (open)
32
SENS
I
Internal status (SENSE) input from the CXD2650R (IC121)
33
SHOCK
I
Track jump detection signal input from the CXD2650R (IC121)
34
NC
—
Not used (open)
35
CD/VIDEO
O
Selection signal output terminal for the optical-in signal (CD/VIDEO) “L”: CD, “H”: VIDEO
36
STB
O
Strobe signal output to the regulated power supply IC (IC501)
“H”: power on, “L”: standby mode
37
REC-P
I
Detection input from the recording position detect switch (S688) “L” active
38
PB-P
I
Detection input from the playback position detect switch (S687) “L” active
Summary of Contents for MDS-EX77
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Page 48: ... 51 52 6 6 PRINTED WIRING BOARDS MAIN DISPLAY Section See page 32 for Circuit Boards Location ...