JVC XV-N350B Service Manual page 16

ELECTRICAL TROUBLESHOOTING GUIDE
A
RESET or power on.
Show LOGO?
YES
Does
Tray move inside
when it is not at closed
position?
YES
B
Flash
NO
memory operates
properly?
SDRAM
works properly?
ZR966
VIDEO outputs
properly?
Have TV
signal output?
Check AV cable
connection to TV set.
Normal
NO
TROUT & TRIN
signals?
Normal
TRCLOSE & TROPEN
signal?
Normal LOAD+ &
LOAD signal?
Check the cable connection
between main PCBA and loader.
3-5
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check connection lines
between FLASH & ZR966
and the FLASH access time
whether is suitable or not.
Check connection lines
between SDRAM & ZR966
and the SDRAM is damaged.
Check the related
circuit of ZR966.
Check the filtering and amp
circuit of TV signal.
Check the load OPEN &
CLOSE switch
Check the Tray control IO
pins on ZR966 & AM5890S.
Check the Tray control
amplifying circuit on motor driver.