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Akai RC-90 Service Manual page 5

Infrared ray wireless remote control unit

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V.
SCHEMATIC
DIAGRAM
OF
ICs
MS0110P
KEY INPUT
ENCODER
KEY
IN
TIMING
GENERATOR
SCAN SIGNAL
GENERATOR
2)—@)
osc
osc
OUT
IN
ouT
TRANSMISSION
OUTPUT
TRANSMISSION
CODE
(MS5OIIOP
CODE
ii
—» "9"
|
| —» "|"
EXAMPLE
MUU
LULL,
000
1
!
000
0
i
;
:
1 WORD
(10 BIT)
25ms
WAVE
FORM
OF LSi MS5OIIOP
PIN @ (RC-90T/RC-9IT)
ewo HMMM
DAMM _,,
MLL
AA
LILA
NAA
_,, 8
re UL I A
LULL,
LULA
LULL, A
LULA,
REV
STOP
REW
AUTO MUTE
(RC-90T: REC MUTE)
REC PAUSE
.(RC-90T > REC)
AUTO FADER
(RC-90T ; PAUSE)
M50111P
wen Se
OSC OUT
_ _ _ |
AUTO CLEAR
AC
mO
CIRCUIT
ey
RECEPTION
Si ((4)—mO] SIGNAL INPUT | |
CIRCUIT
KLOCK
INPUT
FOR SD/CL
SERIAL DATA
SHIFT REGISTOR
Mae
iNT (12)
PROCESSOR
OUTPUT
TC40H002P
INSTRUCTION
DECODER
E
MULTIPLE
KEY JUDGE
(16) Vpp (2.2 to BV)
(1) Vss (Ov)
PIN ©)
TC4028BP
Voo
BCD
TO DECIMAL
ao
uJ
Q
Oo
S)
ve
Q
Vss
(16) Vpp (4.5 to BV)
TIMING
GENERATOR
(1) Vgg (ov)
ae,
SurRuE
|
a
CIRCUIT
ee
a
(4) D9
DEMODULATOR
©) | ara
|
|
bp | OUTPUT
me
Tt"
MALFUNCTION
PREVENTION
CIRCUIT
a
STA
DECODE
(9) sted ouTPUT
RECEPTION
a
DETECTION
n
RECEPTION
CIRCUIT
IR| INDICATE
OUTPUT
SERIAL-DATA
(10) so laucrur
4A
4yY
3B
3A
3Y
TRUTH
TABLE
INPUTS
SELECTED
po fe | eta
tH
pe tetetetl
a
|
pete tetay
a
Petey atecl
e
|
pete
yet ay] os
peta pete
pete
fet Hw | os |
pe tH [Hie]
oe |
petuiwxtH
|] oe
pHi *® | ete]
oe
pH {etal
Hy] a9 |
%&: DON'T
CARE
Vec
LIMITER |
LEVEL
-
WAVEFORM
SHAPPER
|
PEAK
DETECTOR

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Rc-91