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A-711/711L
CIRCUIT DESCRIPTION
Pin functions
Pin No.
a
Pin name
10
Symbol
Description
1
RESET
]
RESET
<
Reset input {H: Reset)
2
CLI
i ek ere
ee
System clock terminal
3
i CL2
.
aise
| System
clock terminal
4
VPRE
_
-
No use.
(GND)
5
| Vos
=
-
No use. (GND)
6
P53
ie)
VOL, DOWN
Motor volume down drive
7
| P§2
ie)
VOL.
UP
Motor voiume
up drive
8
4
i P51
ie)
VOL.
LED
Volume
indicator
LED drive
9g
+ PBO
fe)
S.WOOFER
| Super woofer mute
Hae
10
+ P23
|
0
BASS UP
N.B. circuit volume up drive
VW
: P22
10)
BASS
DOWN
N.B. circuit volume
down
drive
12.
| P2? TOUT
ai
No use. (OPEN)
13
1 P103
fc)
MUTE
Mute
es
14
| P102—
_
0
| POWER
Power relay drive
15
} pio:
She
No-use. (GND)
16
| pice
fe)
SP ON/OFF
Speaker ON/OFF conversion
HON
17
| Ptt3
fi
| vouuir in
Volume position detection input
1B
| PI2
|_|
REMOCON IN
Remote contro! input
19
Pit?
110
DATA
Serial data input/output
20
}
P11d
vO
BUSY
Serial busy input/output
21
Voo
-
_
Power supply pin
22
P93
ie)
S.WOOFER
Super woofer
LED drive
23
P92
0
SURROUND
Surround ON/OFF and LED drive
toh.
24
Pg}
—
-
No use. (OPEN)
25
P90
fe)
TAPE
TAPE LED drive
27
| a2
0
28
| P8i
?
6)
cb
CD LED drive
29
| P8c
4
-
-
| No use.
(OPEN)
30
| Pas
i
SP OFF
Speaker OFF detection input
Tun St OFF het
31
| P42
me
-
No use. (GND)
32.
«Pat
a
es
| No use. (GND)
33.
—«| PAO
[ -_|-
T No use. (GND)
34
| P33
-|-
No use. (OPEN)
35
| P32
eens
Recs
[No use. (OPEN)
36
| P34
Q
KS1
Key scan
output signal 1
37
| P3C
L
Q
KSO
[ Key scan
output signal 0
33
t POSS!
i
\
KR3
_| Key return input signal 3
39
| poziso
\
KR2
Key return input signal 2
40
| POWSCK
1
| KR
Key return input signal 1
a4
F POCHINTO
1
KRO
| Key return input signal 0
42
| vss
i
GND pin
24
A-AWUAIL
CIRCUIT DESCRIPTION
Timing chart
(1) POWER KEY ON
t
1
1
500ms
Ss
=!
MUTEW3 ar
elas
a
aaa
|
ee
KEY ON
LED data output
(2) SELECTOR, SURROUND,
SUPER WOOFER
KEY ON
1
i
|
LED data output
t
1
1
* When the switching of POWER ON/OFF or selector is executed in the con-
dition of SUPER WOOFER
ON, S. WOOFER
MUTE will have the same tim-
ing as MUTE
(The logic is reverse}.
Test mode
initial status
a) Setting method
Item
Condition
While pressing the ''CD'' key and tuning ''DOWN"' key, insert
the AC plug into the outlet and simultaneously touch off the
key; then the amplifier and tuner simultaneously enter the TEST
SURROUND
MODE. When you wish to enter only the amplifier into the TEST
SUPER WOOFER
MODE, pull out the AC plug from the outlet in the POWER ON
condition and insert the AC plug into the outlet while pressing
MUTE
the "CD" key.
b) Clearing method
\n order to simultaneously clear the amplifier and'tuner, press
either the ten keys, ''BAND'' key or UP/DOWN"
key.
In order to clear the amplifier, press either ''TUNER'' key or
pull out the AC from the outlet. In order to clear the tuner, refer
to the tuner microprocessor (page. 22).
c) Contents of operation
@ POWER is turned ON and all the LEDs are lit on.
@ By pressing ''S-WOOFER", both the VOLUME and N.B. CIR-
CUIT are simultaneously up, and remain to be UP for 12 se-
conds. Then, they go DOWN
and STOPS after about 12
seconds.
@ Even if the "CD'", 'TAPE', ''DAT/LD'', "SURROUND" and
""POWER" keys are pressed, they are not accepted.
a
ae
OFF (STAND BY)
2
ON
MOTOR VOLUME CONTROL
OFF
LEO
OUT LIGHTS
Initialization: Pull the AC plug from the outlet and then insert again.
25
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