Read Sharp HT-M700H (serv.man7) Service Manual online
HT-M700H
7 – 3
• The CD disc is not recognised. (When the laser beam does not
go on)
go on)
Is the voltage of 3.4 V being applied to the emitter of QQ2 ?
No
Check the A_5 V line.
Yes
Is the voltage of 2.3 V being applied to the pin 15 of JJ1 ?
Yes
Check connection of optical pickup cable.
If it is normal, replace the optical pickup mechanism unit.
If it is normal, replace the optical pickup mechanism unit.
Place the disc on the tray and close it.
Yes
When checked, disc starts rotating?
Yes
Refer to "Disc does not turn."
No
Is the level of RF signal which is output from
pin 57 of U9, normally ?
pin 57 of U9, normally ?
Yes
Check for contamination of objective lens of optical pickup.
No
No
Replace the DVD servo PWB unit.
Replace the optical pickup mechanism unit.
No
check the DVD servo PWB unit.
Yes
Both picture and sound do not operate normally. (1)
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