Zenith ZDA311 Series Service Manual page 15

A
Show LOGO?
YES
Does Tray move inside when
it is not at closed position?
YES
B
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NO
Flash Memory operates
properly?
SDRAM works properly?
MT1389D VIDEO outputs
properly?
Have TV signal output?
Check AV cable connection
to TV set.
NO
Normal 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 & MT1389D and the FLASH
access time whether is suitable or not.
Check connection lines
between SDRAM & MT1389D
and the SDRAM is damaged.
Check the related circuit of
MT1389D.
Check the filtering and amp
circuit of TV signal.
Check the load OPEN &
CLOSE switch
Check the Tray control IO
pins on MT1389D & IP9008.
Check the Tray control
amplifying circuit on Motor
driver.