Akai CFTD2011 Service Manual page 6

TROUBLE SHOOTING FLOW CHART (2)
Audio Issue
No Sound
R or L no sound
Noise
Sound low
TV Check or change U7,U18
Back to default setting
Other Source CheckU18 check U26,U27 output
Check Main Board and wire connecting
all source Check Main Board
Check U7
Check Speaker connecting
one port Check U7,U26,U27
Check Speaker connecting
all source Check U7,U26,U27
Check Speaker
one port Check U7,U26,U27
Check signal input source
all source Check U7,U26,U27
Check U26,U27 power supply
TV check signal source
Back to default setting
Check U7,U26,U27
4
wire U26,U27 output