Casio A-10 - 25 V Circuit; Voltage Line

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VOL
V25LCD (To LCD)
(25 V)
Contrast
Dial
D10
Q17
Q30
3.77 V
Q31
Q32
V3SYS
VDD
EXT
U23
VOUT
DC/DC
Converter
(Generates 25 V)
PLCDB
V3 Circuit
U1
HD6417096
CPU
U3
MB87A908
SYSTEM
U301
32M-MASK
ROM
U4
MBCG25942
3 V 5 V
J10
3P Jack
Connector
PCMCIA
U601
LA5312V
LCD D/D
LCD
D601/602
LED
Q3 ~ Q7
Touch Panel
U7/U8
UPD42S16160
D-RAM
U6
MAX3241
RS232 C
U5
MC34119
Audio IC
U18
TFDS3000
IRIC
Memory Slot
V3SYS
V3ROM
V3RAM
V3AUD
V5SYS
V5CARD
V25LCD
V3IRDA
25 V Circuit
DC-DC converter RN5RY202 (U23) generates +25 V and it makes up 25 V system for LCD.
V25LCD : +25 V source for LCD.
VOL : Connect to Contrast Dial on Z305-LD PCB.
PLCDB : Controls ON/OFF of V25LCD. From pin 167 of SYSTEM LSI.
V3SYS : +3.3 V source.
Voltage Line