DHC-EX880MD, DHC-MD717, TA-EX880, TA-MS717 - Sony Audio Service Manual (repair manual). Page 7

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4-5.
IC  PIN  FUNCTION  DESCRIPTION
 PANEL BOARD   IC101   
µ
PD78082GB-A293BSMTX (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Function
1 to 3
I
Not used (fixed at “L”)
4
DESTINATION
I
Input terminal for the destination setting (fixed at “L”)
5
AC3 VOL
I
Detection input of the VOLUME (RV204) position    “L”: minimum, “H”: maximum
6
I
Not used (fixed at “L”)
7
FUNCTION/C
O
Function select signal output terminal (C)     *1
8
FUNCTION/B
O
Function select signal output terminal (B)     *1
9
FUNCTION/A
O
Function select signal output terminal (A)     *1
10, 11
I
Not used (fixed at “L”)
12 to 15
DATA 0 to
DATA 3
I/O
Two-way data bus with the system control bus
16
LED-CLK
O
Serial data transfer clock signal output to the LED driver (IC102)
17
VSS
Ground terminal
18
LED-DATA
O
Serial data output to the LED driver (IC102)
19
LED-LATCH
O
Serial data latch pulse output to the LED driver (IC102)
20
LED-RESET
O
Reset signal output to the LED driver (IC102)    “H”: reset
21
LINE-MUTE
O
Line muting on/off control signal output terminal    “L”: line muting on
22
DIRECT
O
Source direct function on/off control signal output terminal   “H”: source direct on
23
GND
Ground terminal
24
DBFB-SW
O
DBFB function on/off control signal output terminal   “L”: DBFB on
25
DBFB-LEVEL
O
DBFB sensibility selection signal output terminal   “L”: DBFB high, “H”: DBFB low
26
MUTE–20dB
O
Attenuator control (–20 dB) signal output terminal    “L”: attenuate (–20 dB) on
27
VOL-LOUD
O
Motor control signal output to the volume control motor driver (IC104)   “H” active
28
VOL-WEAK
O
Motor control signal output to the volume control motor driver (IC104)   “H” active
29
AC3
O
Dolby surround (AC-3) system control output terminal   “L” active
30
AC-CUT
I
AC off detection signal input terminal    “L”: AC off
31
Y-BUS-CLK
I/O
Bus data transfer/reading clock signal in/out terminal for the system control bus
32
Y-BUS-BUSY
I/O
Busy signal in/out terminal for the system control bus
33
I
Not used (fixed at “L”)
34
GND
Ground terminal
35
RESET
I
System reset signal input from the reset signal generator (IC103)    “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
36
GND
Ground terminal
37
X2
O
Main system clock output terminal (5 MHz)
38
X1
I
Main system clock input terminal (5 MHz)
39
VDD
Power supply terminal (+5V)
40
AVDD
Power supply terminal (+5V) (for A/D converter)
41
AVREF
I
Reference voltage (+5V) input terminal (for A/D converter)
42
GND
Ground terminal
43
KEY 1
I
Key input terminal (A/D input) (S101 and S102)    FUNCTION 
>, FUNCTION . keys input
44
KEY 2
I
Key input terminal (A/D input) (S103 to S105)
–20dB MUTING, SOURCE DIRECT, DBFB keys input
*1 Function select control
Function  
  Terminal
FUNCTION/A (pin 9)
“H”
“L”
“L”
“H”
“L”
“H”
“H”
FUNCTION/B (pin 8)
“L”
“H”
“L”
“H”
“H”
“H”
“L”
FUNCTION/C (pin 7)
“L”
“L”
“H”
“H”
“H”
“L”
“H”
(  ): TA-MS717
TUNER
CD
MD
TAPE
VIDEO 1
(CS/BS)
VIDEO 2
(LD/DVD)
VIDEO 3
(VIDEO)
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