4-2
The power can not be on or off
Go
Yes
Yes
No
No
The power can’t be
on or off
Yes
Repair the power board
Check the power supply
on the power board is
normal.
Check/Correct
connection
Whether the connection
to K303 is broken.
Correct the connection
Replace U20.
No
No
Yes
Yes
Check if the XS301 on the
front board to XP5
on the
decoder board is in good
contact.
Whether there is 0V and
3.3V voltage difference on
Pin 39 PCON of U20.
Trouble shooting chart
Содержание DVP3880K
Страница 37: ...6 10 6 10 Front Control Board Print layout bottom side ...
Страница 38: ...6 11 6 11 Karaoke and USB board Print layout top side bottom side ...
Страница 39: ...6 12 6 12 Power Supply Print layout bottom side ...
Страница 40: ...6 13 6 13 Main Board Print layout top and bottom sides ...