Yamaha Silent SB Series Service Manual page 49

SILENT SB SERIES OVERALL CIRCUIT DIAGRAM (MN, KEY SENSOR, HP-UPS, MN POWER SUPPLY)
Damper pedal
Soft pedal
PHOTO
COUPLER
PHOTO
COUPLER
OPEN
N.C
PHOTO
COUPLER
OPEN
About 4.3V
REGULATOR +12V
OPEN
MOTOR DRIVE
Vcc is +12V or +20V.
POWER
SUPPLY
OP AMP
SILENT SB SERES
NAND
CPU
ROM WAVE L 64M
DRAM 4M
ROM WAVE L 64M
REGULATOR +3.3V
DAC
OP AMP
DAC
REGULATOR -5V
REGULATOR +5V
OP AMP
N.C
Transistor
Array
Photo Coupler
DRAM 4M EPROM 8M
SWP30
N.C
CPU1
N.C
INVERTER
SYSTEM RESET
OP AMP
INVERTER
KSN05A-V858590
REGULATOR
V798670 1
AC Adaptor
PA-300
FL Coil X5
SBT Coil X5
NJM78L05UA (XJ598A00) NJM79L05UA (XN086A00)
REGULATOR +5V REGULATOR -5V
MN :IC103
1: OUTPUT
2: COMMON
3: INPUT
µPC2412AHF (XR833A00) M5237ML (XP154A00)
REGULATOR +12V REGULATOR +3.3V
MN-PS :IC001
1: INPUT
1
2: COMMON
2
3
3: OUTPUT
SI-8050S (XT442A00) NJM7812FA (XJ608A00)
REGULATOR +5V REGULATOR +12V
MN-PS :IC003
1
3
5
1: V in
2
4
2: SW out 3
2
1
3: GND
4: V os
5: S.S
Semiconductive Cera. Cap.
Ceramic Capacitor
Metal Oxide Film Resistor
Carbon Resistor (Chip)
Parts inside of are not installed.
Note: See parts list for details of cicuit board component parts.
SILENT SB SERES
DC-DC CONVERTOR
+ 12V
µPC2412AHF
REGULATOR
+ 5V
V438930
(HP1/2)
VOLUME
HEADPHONES
Rotary SW (Pitch) SW1 or SW2
REVERB
(HP2/2)
MN :IC104
1: COMMON
2: INPUT
3: OUTPUT
MN :IC024
1: COMMON
2: INPUT
3: OUTPUT
MN :IC115
1: OUTPUT
2: INPUT
3: COMMON
SILENT SB SERES