Yamaha KB-180 Service Manual page 46

A B C
KB-180/SKB-180 OVERALL CIRCUIT DIAGRAM (AM, MIDI, PB, DMLCD, PNL, PNR, 61H, 61L)
1
DMLCD
2
LCD
DRIVER
3
XX
4
XX
SYSTEM RESET
C to E-8
5
CPU
(USB)
6
XX
7
to K-5
B
8
XX
XX
RH5RZ25CA-T1-F (X3679A00) BA33BC0FP (X5889A00)
REGULATOR +2.5V REGULATOR +3.3V
DMLCD: IC103 DMLCD: IC102
9
2
1
1
2
3 1. GND 1. INPUT
3
2. INPUT 2. GND
3. OUTPUT 3. OUTPUT
RH5RZ50CA-T1-F (X6959A00) BA60BC0T (X6980A00)
REGULATOR +5V REGULATOR +6V
DMLCD: IC101 AM: IC151
10
1
2
3
1. GND
1: INPUT
2. INPUT
2: GND
1
3. OUTPUT 2
3: OUTPUT
3
DTC123JKA (VY677600)
DIGITAL TRANSISTOR
DMLCD: TR705
3
2
1
R1 OUT
IN
1: GND
R2
11 GND 2: IN
IN
OUT 3: OUT
GND
12
KB-180/SKB-180
A B C
D E F G
P2 ROM 128M
PROG./WAVE
XX
MR27V12852L-103TA0
DRAM 4M
CPU
(SWL01T)
OR
ADC
OP AMP
DAC
XX
A
OP AMP
to J-2
to A-5
C
D E F G
H I J
XX
XX
A
to E-8
XX
XX
XX
XX
FLASH ROM 4M
XX
REGULATOR +5V
REGULATOR +3.3V
POWER SUPPLY
REGULATOR +2.5V
DECODER DECODER
xx
: Ceramic Capacitor
: Mylar Capacitor
61H
: Semiconductive Ceramic Capacitor
(C4~C6)
: MetalFilmResistor
XX : Not installed
Note1 : See parts list for details of circuit board component parts.
Note2 : The large numbers with function are indicated the first digit
of the part reference number.
WARNING
Components having special characteristics are marked
replaced with parts having specifications equal to those originally installed.
28CC1-8822437
H I J
K L M
PNR (PN 1/6)
XX
TRAD.ACD FR.HORN
YANGQIN
VIVES BRASSECT
xx
DIZI1 STRINGS HARP
XX
SUONA1 VIOLIN SQUARELD
ERHUENS SWEETFLT CLASSGTR
GRANDPNO CLARINET ACO.BASS
HARPSI. OBOE SFXKIT1
CHARCHORG SWEETTP
28CC1-2001002847 1
XX
PNR (PN 3/6)
B
to B-8
28CC1-2001002847 1
XX
MIDI
OUT SUSTAIN PEDAL
IN
XX
MIDI
(AMJK 2/6)
EXPRESSION
BYPASS CAPACITORS
28CC1-2001002838 5
AM (AMJK 1/6)
and must be
AM
61L
(AMJK 4/6)
(C1~B3)
MASTER
VOLUME
28CC1-2001002844 6
28CC1-8822436
K L M
N O P Q
KB-180/SKB-180
PNL
(PN 2/6)
XX
LUOGU METRO4/4
ROCK
28CC1-2001002847 1
PNL (PN 4/6)
PB (AMJK 6/6)
PORTAMENTO
PITCH BEND
XX
28CC1-2001002844 6 28CC1-2001002847 1
SPEAKER R
XX
AM (AMJK 5/6)
28CC1-2001002844 6
STANDBY/ON
28CC1-2001002844 6
BACK LIGHT
POWER SUPPLY
XX
REGULATOR +6V
BATTERY
DC IN 12V
XX
POWER AMP. 6W+6W
PHONES/OUTPUT
XX
XX
Flame Proof Carbon Resistor
SPEAKER L
28CC1-2001002844 6
KB-180/SKB-180
N O P Q
1
2
3
4
5
6
7
8
9
10
11
12