Cambridge Audio Azur 650A Protect

[Lynyrd]

Hello.
Need help for CAMBRIDGE AUDIO AZUR 650A Amplifier.
Amplifier is in Protect mode.
CAP5 protect led blink 4 times which means
shorted speakers,but no speakers connected to Amplifier.

Please help me where I need to control.

Regards

 

[Lynyrd]

Service manual

 

[Lynyrd]

Its +5v on pins 1 & 7 of U4 on speaker PCB.
On pins 2...3...4...5....6....8....0v

 

[Lynyrd]

Its ok,U4 was bad, after replacing Amplifier works fine