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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 IDigital/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 @¶)
