Sharp XL-DV60 - Product Maintenance; Cleaning Internal and External Components

XL-DV60
7 – 4
When toc can read out and play normal, but no sound, please check as the following steps:
(4) Others.
Is the waveform correct?
(Waveform drawing Figure 6)
No
Check U9.
Yes
Is U1 output L/R and sub woofer normally?
No
Change U1.
Yes
Is J1 connect correctly?
No
Connect J1 well.
Yes
Check CNP904 if connect well.
Figure 6
Stop