Haier MT5311 Manual page 83

6. Audio Trouble no sound 6. Audio Trouble no sound
N
N
Check external
audio equipment
Check
External
speaker
Reset it
No Sound
Check if there is audio signal input
volume, Mute is normal volume Mute is normal
Y
N
Check pin No.AA8 Check pin No AA8
Change
of UM1/5311
and circuit of R1830
Y
Check if the set of
Y
Check signal output of C0N1
Y
Check if pin No.25 of U38 is 0V Check if pin No 25 of U38 is 0V
Check the signal input
Y Y
Check the signal output on
pin No.1,4,39,36of U38.
N Y
Check the signal input
of UM1 audio
toAD25/AD22PIN
Y
Change
UM1 UM1
Check the circuit
from U38 and to
U38
C0N2
-82-
N
Check if power supply of
pin No.2,3,34,35of U38 is 24V
Y
on pin,No.22 of U38
N N
Check the signal output on
pin No.H24of UM1
N
g p
N
Check the network from
Check the
UM1(pin No.H24)
circuit from circuit from
to U38 (pin No.22) to U38 (pin No 22)
audio input
terminal to
UM1
N
Check the
power
Y
Control
circuit of
amplifier