– 9 –
SECTION 3
DIAGRAMS
3-1.
IC PIN FUNCTION DESCRIPTION
• PANEL BOARD IC101 MB89193A-157 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I / O
Function
1
MIC-IN
I
Plug in detection signal input of the MIX MIC jack (J201)
Insert the microphone plug with the jack when “H”
2
STANBY
O
Power on/off control signal output terminal “H”: power on, “L”: standby mode
3
K-PON
O
Control signal output to the KARAOKE PON circuit “H”: KARAOKE PON on
4
KEY0
I
Key input terminal (A/D input) POWER key (S101) input
5
VSS
—
Ground terminal
6
RST
I
Power on 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”
7
XIN
I
System clock input terminal (4 MHz)
8
XOUT
O
System clock output terminal (4 MHz)
9
VSS
—
Ground terminal
10
AUB-OUT
O
Output terminal of the audio bus signal
11
AUB-IN
I
Input terminal of the audio bus signal
12
SIRCS-IN
I
Sircs signal input from the remote control receiver (IC102)
13
VOL-UP
O
Motor control signal output to the volume up/down motor driver IC (IC104)
“H”: volume up
14
VOL-DOWN
O
Motor control signal output to the volume up/down motor driver IC (IC104)
“H”: volume down
15
–20dB MUTE
O
Control signal output of the –20 dB mute “H”: –20 dB mute on
16
DIRECT
O
Control signal output to the SOURCE DIRECT circuit “H”: SOURCE DIRECT on
17
DBFB LEVEL
O
DBFB level select signal output terminal “H” : DBFB LOW, “L”: DBFB HIGH
18
MUTE
O
Control signal output of the line mute “H”: line mute on
19
KEY1
I
Key input terminal (A/D input)
–20 dB MUTING, SOURCE DIRECT, KARAOKE PON, DBFB keys (S104 to S107) and rotary
encoder (S110) for the FUNCTION
20
DBFB ON/OFF
O
Control signal output to the DBFB circuit “H”: DBFB off, “L”: DBFB on
21
OPEN
—
Not used (open)
22
VSS
—
Ground terminal
23
VCC
—
Power supply terminal (+5V)
24
ANALOG/
DIGITAL
I
Digital/analog recording mode select input (ANALOG/DIGITAL select switch (S901) input) of
the AUX/VIDEO 2 IN terminal “H”: analog recording mode, “L”: digital recording mode
(TA-EX77 only)
25
FUNCA
O
26
FUNCB
O
Function select signal output terminal *1
27
FUNCC
O
28
VCC
—
Power supply terminal (+5V)
*1
TAPE
“H”
“H”
“H”
VIDEO 2
“L”
“H”
“H”
VIDEO 1
“H”
“L”
“H”
MD
“L”
“L”
“H”
CD
“L”
“H”
“L”
TUNER
“H”
“L”
“L”
Terminal
Function
FUNCA
(pin
@∞
)
FUNCB
(pin
@§
)
FUNCC
(pin
@¶
)
Summary of Contents for CDP-EX770
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