VI.
disc can not be loaded or unloaded; picture is normal
causes: faults may come from loader or power supply parts
solutions:
(i)
Check if VFD display works properly; if no, loader or lines faults; if yes,
loader or 5V power supply faults
VII.
No picture and sound, indicator lights
Causes: faults may come from decoder part
Solutions: (i) check if 27m crystal is vibrant
(ii) check if flash 29f800 is connected
(iii) zr36768 or AT24C02 works improperly
VIII. VDF display does not lights
Causes: faults may come from VFD or drive part
Solutions: (i) Check if lines are connected
(ii) Check power supply and –25 voltage
(iii) VFD does not work
(iv) PT6312 does not work
