Read Sharp DV-HR480H (serv.man2) Service Manual online
16
DV-HR400S/H
DV-HR450S
DV-HR480S/H
7. TROUBLESHOOTING
P
o
wer On Pr
ocess 1
External power supply start (AC outlet
connection)
T
urn on
TT
microprocessor IC501 and
remote control light sensor
TT
microprocessor IC501 (14 MHz) starts
to oscillate
TT
microprocessor IC501 imports
E2PROM IC503 data and communicates
This pass is followed
when backup is
retained.
T
urn on power temporarily to
perform this process.
TT
microprocessor
initialization start
IC7508 startup & communication & stop
process
Standby after
-- : --
in the LCD display flashes
DISC information
acquisition
Cancel power-saving mode
This pass is followed
when backup is not
retained.
T
urn on power with remote control
or main unit
LCD display start/HDD and DVD LED
flash
TT
microprocessor IC501 sets PCON to
ON
Cancel IC7508 reset after approximately
160 msec from PCON
Startup operation start
P
o
wer On Pr
ocess 2
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