Yamaha EZ-AG Service Manual page 32

1 2 3
EZ-AG OVERALL CIRCUIT DIAGRAM 1/2 ( DM )
DM TMUTE [0-5]
to MUTE Plate
STRINGS, PIEZO SENSOR
to SE-CN901
SPEAKER 4 Ω
PN DATA I/O
to PN-CN3
INVERTER
MULTIPLEXER
SYSTEM RESET
not used
MASK ROM 32M WAVE
SCSO, SMA [0-20]
EZ-AG
4 5
OP AMP
OP AMP
OP AMP
**
OP AMP
**
**
OP AMP
**
OP AMP
**
OP AMP
MUT [0-5]
INVERTER
INVERTER
SWX00B
SMD [0-15], SOE
REGULATOR +3.3V
6 7
DC-DC CONVERTER
INVERTER
MUTE AMP
INVERTER
** **
INVERTER
** **
DAC
INVERTER
** **
INVERTER
** **
INVERTER
**
**
INVERTER
MASK ROM 16M (PROGRAM)
SRAM 2M (128K x 16)
CMD [0-15]
CMA [1-21], CWE
AND
8 9 10
DC-DC CONVERTER
VCC/LINE OUT/MIDI
OP AMP
IC301 or IC302 are installed.
AND
P2ROM (PROGRAM)
AND
FLASH 4M (256K x 16)
AND
28CC1-8826575
11 12
EZ-AG
A
B
C
to AM-CN801
**: not installed
Note: See parts list for details of circuit board
component parts.
µPC2933AT-E1 (X0638A00) D
PQ1CZ1T (XR404A00)
DC-DC CONVERTER REGULATOR +3.3V
IC503 IC102
2
1: VIN
1
2: VOUT
3
3: OADJ
1: V in
1
2
3 4: ON/OFFcont. 2: GND
4
5
5: COMMON
3: V out
RLS-73 TE-11 (VV925900) SFPB-62V (VZ060500)
DIODE DIODE
D502 D501
E
1
1
2 2
1: ANODE 1: ANODE
2: CATHODE 2: CATHODE
RD2.0S-T1 2.0 (WB426000)
ZENER DIODE
ZD601-606
1
2
F
1: ANODE
2: CATHODE
G
H
2
EZ-AG