Yamaha KB-180 Service Manual page 45

A B
KB-180/SKB-180 BLOCK DIAGRAM
TOUCH RESPONSE
Keybord 61KEY (16N)
61L 61H
(C1~B3) (C4~C6)
PC0-5,PD0-5 PC0-5,PD0-5
SW1-36
SW37-61
CN2 (5P) CN1 (12P)
CN5 (7P)
CN402 (7P) CN403 (5P) CN401 (12P)
DMLCD
+3.3D
DECODER 16 16 DECODER LED DRIVER
74LV138A VCC VCC 74LV138A
PF0
TR705
IC401 (16P) IC402 (16P)
117
VDD
+2.5V 15,46,89,119
IOVDD
24,47,66,90,120
+3.3D
37,121
CPU
+5D
SWL01(T)
IC302 (5P)
YMW767-VTZ
5
32
RESET
4 40
16
+3.6V 50ms
IC301 (128P) 42-44
41
X301
16.9344MHz
12
Crystal SMD-49
13
F Tolerance±100PPM
32,34-36 67,68,123
IRQ0
TXD0
MA01-23
RXD0
MD00-15
PC7
MA02-23
MD00-15
P2 ROM
128M
PROG./WAVE
IC202
(56P)
VCC
43
RESET
28CA1-2001002836 1
C D
PB PNL PNL
(AMJK 6/6) (PN 4/6) (PN 2/6)
VR751
PA6
SW771
PA6
PB6 PB6
LED
PITCH BEND
LD753
1PCS
AIN1
+3.3D
+5D
LED DRIVER
PA0-PA7
VDD
TR701-704
PA0-PA7
RS, ENB
36,38
+6A
REGULATOR +5V
IC101 (3P)
+5D
+5A
PB0-PB7 REGULATOR +3.3V
PA0-PA7
IC102 (3P)
+3.3D
RS, ENB
REGULATOR +2.5V
IC103 (3P)
+2.5D
+6A
+5A
14
PC7
5 11
L
DAC
BUFFER/
2,3
SD0
12
3
24bit
LPF
1,2,4
9 R
BCLK 5,6
IC502 (8P)
IC501 10
WCLK
(16P)
SYSCK
fc=27KHz
+3.3D
/UWR, /LWR, /CAS
2
ADC AIN1
BCLK 7
WCLK 8bit
AIN4
4
1,10
IC801
SDI
9
(10P)
MA01-18 MA01-09
MD00-15 MD00-15
+3.3D
1,2,4
FLASH DRAM 14
/UCAS
/LCAS OR
ROM 4M
8,11
74LV32A
4M
30,31
IC206 IC204
IC207 (14P)
(48P) (44P)
12 VCC VCC
37 1,6,22
+3.3D
E
PA4
PA4,PA6,PA7,PC6
SW MATRIX
LED
( SW 25PCS )
PB0-PB7
LD752
SW746~770
1PCS
CN774 (16P)
CN703 (16P)
LED
PB0-PB7
PA0-PA7
33
LCD
LCD
DRIVER
DISPLAY
IC601
(80P)
BACK LIGHT
LED: 2PCS (Blue)
+6A
+V
L
R
AM (AMJK 4/6)
VR551
8 MASTER
VOLUME
L
1
A5KΩ
R
7
MIDI SUSTAIN
OUT IN PEDAL
JK851
JK852
JK853
I/F
DGND
IC851,TR851,852
RXD0
TXD0
PC7
IRQ0
R+
R-
MIDI (AMJK 2/6)
F G
PNR
SW MATRIX
(PN 1/6)
PA0
( SW 39PCS )
SW701-739
(PN 3/6)
LED
LD751
PB0-PB5
PB0-PB5
1PCS
PA6
LED
CN771 (16P)
AM (AMJK 1/6)
REGULATOR +6V
IC151 (3P)
+V
14
L-
13
L+
11
L
1
POWER AMP.
6W + 6W
R R+
6 8
BTL R-
9
LA4625
IC551 (14P)
AGND
R-
R+
AM (AMJK 5/6)
SW151
STANDBY/ON
DGND
SPEAKER R
4Ω 12cm
KB-180/SKB-180 BLOCK DIAGRAM
H
KB-180/SKB-180
1
PNR
SW MATRIX
( SW 6PCS )
PA6
SW740-745
2
+
SPEAKER L
-
4Ω 12cm
3
L+
L+
PHONES /
R+
OUTPUT
R+
JK551
DC IN 12V
AC adaptor
PA-5D
JK151
4
-
BATTERY
+
1.5V x 6
EXPRESSION
JK856
5
6