Akai LEA-19V07P, Service Manual

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5
、
Audio Trouble
（
No sound)
No Sound
Check if have audio signal
input
N
Y
Y
N
Check the set of volume, Mute is normal
Check signal output on pin no. 4 & 6 of U13
Is normal
Check power supply (>11V)on pin no. 7 of
U13/1517P
Is normal
Y
N
Check the voltage (>9.2V) on pin no.8
Of U13
N
Y
Y N
Check external
Check the signal output on pin 64 &65 of U12
Y N
Does it has signal input on U12 Check the circuit from U12 to U13
Check external
Audio equipment
Repair the U13 power supply
Rest it
Check external
speaker
Does Q26 has damage
And repair D60 or R257
10