Akai LEA-16S02P, Service Manual

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No Sound
Check if have audio signal
input
Check external
Audio equipment
Check power supply (>11V)on pin no. 7 of
U21/TDA1517P
N
Y
Y
N
Check the voltage (>9.2V) on pin no.8
Of U21
Repair the U21 power supply
Check the set of volume, Mute is normal
Rest it
Check signal output on pin no. 4 & 6 of U1
Is normal
Y
N
Check external
speaker
N
Y
Does Q28 has damage
And repair D47 or R257
Check the signal output on pin 50 &51 of U14
Y N
Y N
Does it has signal input on U14
Check the circuit from U14 to U21
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