Hi all, I have a Denon 760BL on the bench with odd output issues.
When set to 4ch mode Unbalanced
Channel A input
Output is as follows
Ch A
Left is low distorted,
Right is normal
Ch B
Left is low distorted
Right is normal
When set to 4ch mode Unbalanced
Channel B input
Ch A
Left is normal
Right has no audio
Ch B
Left is high vol distorted
Right is high vol distorted
Turning up input sensitivity on input B causes the amp to trip the relays and it won't turn back on unless the gain is turned down.
I've removed the veritcle boards, cleaned the pots and switches with deoxit and no difference.
The amp idles at around 2 amps
Turning up the gain on input b causes it to draw excessive current then it trips the fuses.
Any help appreciated. Thanks
When set to 4ch mode Unbalanced
Channel A input
Output is as follows
Ch A
Left is low distorted,
Right is normal
Ch B
Left is low distorted
Right is normal
When set to 4ch mode Unbalanced
Channel B input
Ch A
Left is normal
Right has no audio
Ch B
Left is high vol distorted
Right is high vol distorted
Turning up input sensitivity on input B causes the amp to trip the relays and it won't turn back on unless the gain is turned down.
I've removed the veritcle boards, cleaned the pots and switches with deoxit and no difference.
The amp idles at around 2 amps
Turning up the gain on input b causes it to draw excessive current then it trips the fuses.
Any help appreciated. Thanks
Hello Perry
I've discovered the issue isn't output level or gain level associated.
I swapped the source unit for another just incase the input signal was bad and no change.
When I use input A and set the amp to 2ch mode bridging the speaker outputs on ch A and ch B causes the amp to trip and shut down, in fact it makes the relays vibrate/buzz they're tripping so fast.
I've discovered the issue isn't output level or gain level associated.
I swapped the source unit for another just incase the input signal was bad and no change.
When I use input A and set the amp to 2ch mode bridging the speaker outputs on ch A and ch B causes the amp to trip and shut down, in fact it makes the relays vibrate/buzz they're tripping so fast.
Is the 12v power supply sufficient to power the amp at the power levels you're testing at?
Does the amp shut down at the exact same output voltage (at the speaker terminals) whether the amp is driving one channel or two?
Or can you drive one channel alone to a higher output before the amp shuts down?
Does the amp shut down at the exact same output voltage (at the speaker terminals) whether the amp is driving one channel or two?
Or can you drive one channel alone to a higher output before the amp shuts down?
My bench supply is 13.8v 30 amp has no trouble powering most amps
I don't know how to test the speaker voltage when it shuts down, I tested with meter set to DC and it read open circuit when the amp shut down.
When driving one channel it will play at low volume it goes higher if I turn it up thennit cuts out.
The audio has a distinct echo on channel A right spk and a strange bass tone on channel B right speaker
I don't know how to test the speaker voltage when it shuts down, I tested with meter set to DC and it read open circuit when the amp shut down.
When driving one channel it will play at low volume it goes higher if I turn it up thennit cuts out.
The audio has a distinct echo on channel A right spk and a strange bass tone on channel B right speaker