Kenwood DVF-3400-B, Руководство по обслуживанию

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8
D
VF-3400
3. SYSTEM TEST FLOW
TR
OUBLESHOO
TING
TEST
Replace power PCBA or AC transformer.
YES
NO
Switch on the power PCBA
Repair or Replace power PCBA
YES
NO
Make sure the main PCBA don't
short on VCCs and switch it on.
YES
Check the regulators or related diodes.
YES
NO
Connect to PC RS232 cable and
update the FLASH memory code.
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.
NO
A
YES
Check the AC
Voltage Power PCBA (110V
or 220V)
Update FLASH
successfully?
Is the DC
voltage outputs OK?
(5V, 3.3V, 12V, 5.6V
MOTOR)
Is 3.3V
and 1.8V DC outputs normal
on main PCBA?
RESET or power on.
NO NO
YES
Check connection lines
between FLASH & ZR966
and the FLASH access time
whether is suitable or not.
NO
YES
Check connection lines
between SDRAM & ZR966
and the SDRAM is damaged.
NO
YES
Check the related
circuit of ZR966.
NO
YES
Check the filtering and amp
circuit of TV signal.
Check AV cable
connection to TV set.
NO
NO
YES
Check the load OPEN &
CLOSE switch
NO
YES
Check the Tray control IO
pins on ZR966 & AM5890S.
NO
YES
Check the Tray control
amplifying circuit on motor driver.
Check the cable connection
between main PCBA and loader.
YES
YES
Show LOGO?
Flash
memory operates
properly?
ZR966
VIDEO outputs
properly?
Normal
TROUT & TRIN
signals?
Normal
TRCLOSE & TROPEN
signal?
Normal LOAD+ &
LOAD signal?
Does
Tray move inside
when it is not at closed
position?
SDRAM
works properly?
Have TV
signal output?
A
B