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LCD BACKLIGHT
1
HMBV26BG1W63N/AZ
CFL1
When voltage CVDD is supplied, transistors Q501 and 502 start oscillation.
From the oscillation voltage, transformer T501 generates about 600 V which is necessary for lighting the
backlight.
RESET CIRCUIT
When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The
CPU then initializes its internal circuit, and clears the working storage RAM.
When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU sends APO
signal to the power supply circuit, also sends a reset signal to the DSP.
Battery set
VDD
Reset IC
IC2
RN5VD40AA
From power switch
NT-07
10
9
DE0405-979SL180J2K
2
1
2
8
C502
7
5
(Bottom View)
VDD
RESET
PLE
CPU
LSI1
GT-913F
SCKO
POWER
NMI
— 6 —
1
2
3
4
5
T501
LHL08TB101K
Reset signal
APO
To power supply circuit
1
2
L501
VDD
DSP
LSI2
HG51B277FB-1
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