Zenith DVT654, Service Manual

Page: 14 / 87

- 2-8 -
A
RESET or Power On.
NO NO
YES
NO
YES
NO
YES
YES
B
NO
NO
NO
YES
YES
NO
NO
YES YES
YES
Show LOGO?
Flash Memory operates
properly?
Check connection lines between FLASH
& MT1389 and the FLASH access time
whether is suitable or not.
SDRAM works properly?
Check connection lines between
SDRAM & MT1389 and the SDRAM
is damaged.
MT1389 VIDEO outputs
properly?
Check the related circuit of MT1389.
Have TV signal output?
Check the filtering and amp circuit of
TV signal.
Check AV cable connection
to TV set.
Does Tray move
inside when it is not
at closed position?
Normal TROUT &
TRIN signals?
Check the load OPEN & CLOSE
switch
Normal TRCLOSE &
TROPEN signal?
Normal LOAD+ &
LOADsignal?
Check the cable connection
between main PCBA and loader.
Check the Tray control IO pins on
MT1389 & IP4504.
Check the Tray control amplifying
circuit on Motor driver.