Zenith DVT654 Service Manual - page 14

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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.