HT-M700H (serv.man7). Flowchart - Sharp Audio Service Manual (repair manual). Page 2

HT-M700H

7 – 2

When removing disc and applying load to spin motor (by stop-
ping with hand, etc.), objective lends moves up and down ? 
(Checking item to symptom)
Note: If load is not applied to spin, lens does not move and 
becomes NO DISC immediately.

No

Refer to "The "No Disc" indicator. (In case focus servo does not 
function.)".

       

       

Replace U9.

             

Yes

       

Yes

Is FE signal output to pin 40 of U9 when the disc is set ?

No

Is there input signal on the pins 13, 14, 15 and 16 of U9 ?

             

Yes

                                      

No

Is FE signal inputted into the pin 142 of U1A ?

  

  

Check the connection of optical pickup cable.
If it is normal, replace the optical pickup.

 

 

Yes

  

  

 

Check or replace U1A.

In case of CD.
For DVD, pins 9, 10, 11 and 12 of U9 ?

No

Yes

Check the line between the U1A and U9.

Is there focus control signal at output pin 172 of U1A ?

No

Check the U9DAC power source periphery circuit.
If it is normal, replace U9.

     

Yes

Is the focus control signal from the pin 172 of U1A input into the 
pin 1 of U10A ?

No

Check the focus control signal (FOD) line between the U1A and 
U10A.

Check M_5 V line.

     

Yes

No

Is the focus control drive voltage output from the pins 13 and 14 
of U10A ?

No

Is 5 V voltage applied to the pin 8 of U10A ?

Yes

Replace U10A.

      

Yes

Focus control drive voltage applied to pins 1 and 2 of JJ1 (focus 
actuator terminal) ?

No

Check the line between the U1A and the focus actuator terminal.

     

Yes

Check the connection of optical pickup cable.
If it is normal, replace the optical pickup mechanism unit.