Zenith DVB413, Service Manual

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3-5
Show LOGO
A
yes
Reset or Power on
Flash
Memory operates
Properly?
Check connection on lines between FLASH
& M3355 and the FLASH access time
whether is suitable or not.
SDRAM
works properly?
Check connection lines between
SDRAM(IC503) & M3355 and the
SDRAM is damaged.
M3355
VIDEO outputs
properly?
Check the related circuit of M3355.
(IC501 PIN 2.3.7.8 check)
Have
TV signal output?
Does
Tray move inside
when it is not at closed
position?
Check the filtering and amp circuit of
TV signal .(IC604)
B
No No
YES
YES
YES
YES
No
NO
NO
Normal
TROUT & TRIN
signals?
NO
Check the load OPEN &
CLOSE switch
Normal
TRCLOSE &TROPEN
signal?
NO
Check the Tray control IO pins
on M3355.
Normal
LOAD+ & LOAD
signal
NO
Check the Tray control amplifying
circuit on Motor driver.(IC201)
Check the cable connection between
main PCBA and loader. (MECHA)
Check AV cable
connection to TV set
NO
YES
YES
YES