Lab gruppen 14000 fp+series

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hello, I have a problem with an original lab gruppen 14000 amplifier, you turn on the fans start but there's no sound coming out, it's not in protection, I simply found a micro track burned on the ntc1 and a zener diode of 5.6 I have replaced and redone the burned track, but nothing ... someone in the service manual of this amp ..
thanks for collaboration:)
 
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