Sony SLV-7700KME, Service Manual

Page: 85 / 135

6-5
6-7.
A
V
CONTROL
– INPUT SELECTION BLOCK INTERF
ACE (MB-77 BOARD IC705)
*2, *3.
T
he output select switc
hes g
iv
en in 6 and 7 are used f
or selecting f
iv
e sources and as well for the f
ollo
wing
switching;
6. L-ch Output Selection
*2
(0:
0V
, 1: 9V)
Q8 (A
OUTC)
Q9 (A
OUTB)
Q10 (A
OUT
AL)
IC705
!™
IC705
!£
IC705
!¢
0
0
0
L-c
h of
VCD
0
0
1
R-ch of
VCD
0
1
0
L-ch of surround
0
1
1
Not used (R-ch of surround)
1
0
0
L-c
h of
VHS PB
1
0
1
L-c
h of KARA
OKE (e
xcluding surround)
1
1
0
L-c
h of EE (e
xternal input)
1
1
1
Not used (mute = GND)
7. R-ch Output Selection
*3, *4
(0:
0V
, 1: 9V)
Q8 (A
OUTC)
Q9 (A
OUTB)
Q11 (A
OUT
AR)
IC705
!™
IC705
!¢
IC705
!∞
0
0
0
L-c
h of
VCD
0
0
1
R-ch of
VCD
0
1
0
Not used (L-ch of surround)
0
1
1
R-ch of surround
1
0
0
R-ch of
VHS PB
1
0
1
R-ch of KARA
OKE (e
xcluding sur
round)
1
1
0
R-ch of EE (e
xternal input)
1
1
1
Not used (mute = GND)
*4. Q8 and Q9 in common with L-ch.
1. Self Duet
(0:
0V
, 1: 9V)
Q0 (S.D.)
IC705
4
0
Self duet ON & KARA
OKE OFF
1
Self duet OFF
2. B. B.
Audio DAC Emphasis
(0:
0V
, 1: 5V)
Q1 (EMPH)
IC705
5
0
Emphasis ON
1
Emphasis OFF
3. External Input Selection
*1
(0:
0V
, 1: 7 to 8V)
Q2 (INB)
Q3 (IN
A)
IC705
6
IC705
7
0
0
LINE-1 IN
0
1
LINE-2 IN
1
0
VCD REC (onl
y KARA
OKE mode)
1
1
Not used
*1.
V
ideo and audio ar
e common and controlled a
t the same time.
4. Microphone direct sound mixer ON/OFF
(0:
0V
, 1: 9V)
Q4 (MICDR
Y
ON)
IC705
8
0
Mixes direct sound. (when KARA
OKE ON)
1
Does not mix dir
ect sound
.(w
hen KARA
OKE OFF)
5. Surround Setting
(0:
0V
, 1: 3V)
Q5 (SURR1)
Q6 (SURR2)
Q7 (B. B.)
IC705
9
IC705
!º
IC705
!¡
0
0
1
Pseudo stereo
0
1
0
Surround (A)
1
1
1
OFF