Sony DHC-EX77MD / DHC-MD77 / MHC-EX66 / TA-EX66 / TA-EX660 / TA-EX77 / TA-EX770 Service Manual ▷ View online
– 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”
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”
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
“H”: volume up
14
VOL-DOWN
O
Motor control signal output to the volume up/down motor driver IC (IC104)
“H”: volume down
“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 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)
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
(pin
@∞)
FUNCB
(pin
(pin
@§)
FUNCC
(pin
(pin
@¶)
– 10 –
•
IC Block Diagrams
IC104
BA6208
1
2
3
4
5
6
7
8
9
NC
OUTPUT 2
Vcc
GND
NC
INPUT 2
INPUT 1
NC
MOTOR
DRIVE
MOTOR
DRIVE
REG
SWITCH
SWITCH
OUTPUT1
IC105
SN74HC138AN
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
GND
Y7
G1
G2B
G2A
C
B
A
A
B
C
G2A
Y7
G1
G2B
Y6
Y5
Y6
Y5
Y4
Y3
Y2
Y1
Y0
16
VCC
DATA OUTPUTS
OUTPUT
ENABLE
SELECT
Y4
Y3
Y2
Y1
Y0
IC203, 503
MC14052BCP
12
14
15
11
9
16
13
10
1
5
2
4
3
6
7
8
V
DD
SELECT A
SELECT B
3
2
1
0
3
2
1
0
INH 7
V
EE
V
SS
– 11 –
IC701
µPC1237HA
1
2
3
4
5
6
7
8
OVER LOAD DET
F/F
OFFSET DET
LATCH/
AUTORESET
V
CC
ON
MUTE
AC OFF
DET
V
CC
•
Waveforms
1
IC101
7
(XIN)
5.5 Vp-p
4 MHz
2
IC101
8
(XOUT)
5.7 Vp-p
4 MHz
– 12 –
•
Circuit Boards Location
PRIMARY board
SECONDARY board
PANEL board
VOL board
MAIN board
SW board
(EX77)
(EX77)
CONNECTOR board
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