View Single Post
  #2   Report Post  
Posted to sci.electronics.repair
Emanuele Girlando Emanuele Girlando is offline
external usenet poster
 
Posts: 17
Default Sharp HT-M700 DVD player - need help with pickup not driven...

On 1 Ott, 23:46, Emanuele Girlando
wrote:
Inserting disks you obtain "READING" message for a long time. Then "NO
DISK".

Inside inspection (as per FAQ):
the spindle motor correctly runs.
Sled doesn't move unless you manually move it to a different location;
it correctly comes back to the original position. It is correctly
driven.
Neither attempt to focus nor laser light up are performed (dead
pickup).
Removed/cleaned/remounted the pickup flat cable: no change.
The lens servo works if manually powered (lens goes up and down)
The laser lights up if manually powered.
Power supply voltages are as per onboard indications.

Seems a problem with the pickup driver circuitry.
I published a snapshot of the main board @http://www.qsl.net/iw1dhi/pickup-driver.JPG.
Any idea about what to check further? Any information about test
points?
Any picofuse around??

Thanks in advance.
Emanuele.


nobody out there ??