Roadstar DVR-9100, Service Manual, Page: 17 / 76

15
TROUBLE SHOOTING
C. No sound in R/L audio inputs or abnormal sound.
R/L audio error
Check the flat cable
connected to the main
board to see if it’s secured
to the right socket.
Check
positions J3,J45,
U12~U15,U20,U21,U24
on the main board or any resistors
or capacitors nearby for short
circuit or bad
soldering.
Check if the main board and I/O board are
properly connected together (check if the
pin assignments are correctly connected.)
Check
positions J1 & J36 on
the I/O board or any resistors
or capacitors nearby for short
circuit or bad soldering
or damage.
OK
Change I/O board
Change main board
No
Yes
No
Yes