Zenith XBV323 Series Service Manual page 49

A
RESET or Power On.
NO
Show LOGO?
YES
Does
Tray move inside NO
when it is not at
closed position?
YES
B
Flash
NO
Memory operates
properly?
YES
SDRAM
NO
works properl y?
YES
MT1379
NO
VIDEO outputs
properly?
YES
Have
NO
TV signal output?
YES
Check AV cable
connection to TV set .
Normal
NO
TROUT & TRIN
signals?
YES
Normal
NO
TRCLOSE &
TROPEN signal?
YES
Normal
NO
LOAD+ & LOAD-
signal ?
YES
Check the cable connection between
main PCBA and loader. (MECHA)
Check connection lines between FLASH
& MT1379 and the FLASH access time
whether is sui table or not.
Check connection lines between
SDRAM(IC502,IC503) & MT1379 and the
SDRAM is damaged.
Check the related circuit of MT1379.
(IC501 PIN 161,166, 168 check)
Check the filtering and amp circuit of
TV si gnal .(IC604)
Check the load OPEN &
CLOSE switch
Check the Tray control IO pins
on MT1376 & MT1379.
Check the Tray control amplifying
circuit on Motor driver.(IC202)
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