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3. SYSTEM TEST FLOW
TEST
Check the AC
NO
Voltage Power PCBA (110V
or 220V)
YES
Switch on the power PCBA
Is the DC
NO
voltage outputs OK?
(5V, 3.3V, 12V, 5.6V
MOTOR)
YES
Make sure the main PCBA don't
short on VCCs and switch it on.
YES
Is 3.3V
NO
and 1.8V DC outputs normal
on main PCBA?
YES
Connect to PC RS232 cable and
update the FLASH memory code.
NO
Update FLASH
successfully?
YES
A
Replace power PCBA or AC transformer.
Repair or Replace power PCBA
Check the regulators or related diodes.
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal PRD,
RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.
A
RESET or power on.
Flash
NO
memory operates
Show LOGO?
properly?
SDRAM
works properly?
ZR966
VIDEO outputs
properly?
YES
Have TV
signal output?
Check AV cable
connection to TV set.
Does
Normal
NO
Tray move inside
TROUT & TRIN
when it is not at closed
signals?
position?
Normal
TRCLOSE & TROPEN
signal?
YES
Normal LOAD+ &
LOAD signal?
Check the cable connection
B
between main PCBA and loader.
Check connection lines
NO
between FLASH & ZR966
and the FLASH access time
whether is suitable or not.
YES
Check connection lines
NO
between SDRAM & ZR966
and the SDRAM is damaged.
YES
Check the related
NO
circuit of ZR966.
YES
Check the filtering and amp
NO
circuit of TV signal.
YES
Check the load OPEN &
NO
CLOSE switch
YES
Check the Tray control IO
NO
pins on ZR966 & AM5890S.
YES
Check the Tray control
NO
amplifying circuit on motor driver.
YES
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