Akai AX80 Service Manual

//PD781
1G-144
(CPU PCB-IC1)
//PD781G-1
19
(CPU PCB-IC2)
//PD781G-144
KEY BOARD
A-SW INPUT
KEY BOARD
B-SW INPUT
KEY
SCAN
OUTPUT
DATA
ACKNOWLEDGE"
NOT USE
+ 5V
-
POWER
ON
RESET
-
OSCILLATOR
|~~
(l2MHz)|_.
(DIGITAL)GND-
(T)PAo
®
PA
|
VpPA2
®PA3
©PA
4
<6)PA
5
•@PA6
<8)PA
7
©PBq
-<K>)PB
(
OnPBg
•@PB
3
®PB
4
@PB5
•®
PB
6
•®PB
7
-®pc
0
-(l8) PC
i
-@PC
2
^PC
3
-(2l)PC
4
^3)PC
6
g)PC
7
Dnm?
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)MODE
I
})
RESET
>) MODE 2
)X2
<3l) X
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)V
SS
Vcc
pdH
PD6
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PD5
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P0
4
(
P0
3
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PD2
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PD,
I
PD
0
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PF
7
^
PF
6
i
PF
5
(
PF
4
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PF
2
^9>
PP|
PF
0
^
ALE
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WR
RD
AV
CC
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VA
REF^
AN
7
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AN
5
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AN
4
AN
3
£
AN
2
$6>
AN,
$5>
AN
0
(
AVSS6
+
5V<DIGITAL)
+5V {
FOR RAM
)
DATA STROBE
7
BIT
PARALEL
INPUTS
KEY ON/OFF DATA
AND DYNAMICS DATA
7
BIT PARA OUrPUT
KEY
ON/OFF DATA
AND DYNAMICS
DATA
+ 5VUNALOG)
+ 5VU-Q CONVERTER
REF-V)
OCO-I
DCO-2
DATA STROBE
•
p
4
FEET
ON
-
8
FEET ON-
16 FEET ON-
-
32
FEET ON-
-
4
FEET ON
-
8
FEET
ON-
16 FEET ON-
^
32
FEET ON
-
MIDI OUTPUT
*
MIDI
INPUT
-
TAPE
INPUT
-
DATA
ACKNOWLEDGE
-
NEXT
INPUT-
SUSTAIN
INPUT
-
TAPE
OUTPUT-
INTERRUPT
INPUT-
(FROM
JJPD8279)
POWER
ON RESET
-
DATA /ADDRESS
MEMORY
ADDRESS
•
GND (ANALOG)
OSCILLATORf"
(I2MHz)L_
(DIGITAL)
GND
-
(l)PAo
VCC
§4)
+ 5V
(
DIGITAL)
©PAi
V
00
@
+
5V( FOR RAM)
<3)PA
2
P0
7
K2}w*
DO/AO
—
!
•0PA
3
PD
6
fej)<-a*DI/AI
(5)PA
4
POg
D2/A2
<6)
PA5
P0
4
(@K^"
D3/A3
{7)
PAg
PD
3
D4/A4
<8)
PA
7
PD
2
@«*
D5/A6
<9}PB
0
PDl
«6)«-
06
/A6
-@PB|
PD
0
@Hw>D7/A7
<n)PB
2
PF
7
@
—3S-AI5-
<J2)
PB
3
PF
6
AI4
•@PB
4
PF
5
@—
»»AI3
<|4)
PBg
PF
4
m)
AI2
Kf5)PB
6
PF
3
^
—
3»AII
•@PB
7
PF2
©
—
s>
A!0
<H)
PC
0
PFj
@
—
ss»
A9
<|8)PC| PF
0
@
—
**A8
-1
<I9)PC
2
ALE©*s
MEMORY
ADDRESS
ENABLE
}PC
3
WR
@>*
MEMORY
WRITE
STROBE
K2l)PC
4
RD
©•«
—MEMOR
READ
STROBE
|2)PC5 AVCC&3) +5V
(ANALOG)
23)PC
6
VA
REF@
+5V(A-D
CONVERTER REF-V)
(24)
PC
7
AN
7
(4l)<
PARAMETER —
|
)NMI
ANg®« TUNE
INT
I
ANg
(39H*
— MODULATION
)
MODE I
AN
4
B6K
—
VCF
fee)
RESET
AN
3
@<—
DCO
|3lM0DE2
AN
2
&6><
BEND
WIDTH
1X2
AN| BEND
DOWN
,21
'
AN
0
^>*
BEND UP
—1
)Vt3
AV«$(B
6N0
(ANALOG)
ANALOG
INPUTS

Akai AX80 Specifications

General

Brand	Akai
Model	AX80
Category	Synthesizer
Language	English