3-14
ELECTRICAL TROUBLESHOOTING GUIDE
RESET or power on.
NO
NO
YES
Check connection line
between Flash & Mpeg and
the Flash access time
whether is suitable or not
NO
YES
Check connection RAM address and RAM
data between SDRAM & Mpeg and check if
the SDRAM is damage
NO
YES
Check connection Video
output line to Jack
NO
YES
Check the filtering and
amp circuit of TV signal.
Check AV cable
connection to TV set.
NO
NO
YES
Check the load OPEN &
CLOSE switch
NO
YES
Check the Tray control signal IO
pins on Mpeg and Servo IC
NO
YES
Check the Tray control
amplifying circuit on Motor driver.
Check the cable connection
between main PCBA and loader.
YES
YES
Show LOGO?
Flash
memory operates
properly?
Is the Mpeg
Video outputs
properly ?
Is TROPEN
& TRCLOSE signal
outputs properly?
Normal
OPEN & CLOSE
signal?
Is LOAD+
& LOAD-signal outputs
properly?
Does
Tray move inside
when it is not at closed
position?
SDRAM
works properly?
Have TV
signal output?
A
B
jomi