hi all
I have this amplifier p600.2.
It is having 4v from terminal ground to the rca ground. Due to that I think the relay is not coming on and amp even though comes on led remains in protection. Once relay is removed protection goes and has good output on the relay points. Pictures attached.
I have this amplifier p600.2.
It is having 4v from terminal ground to the rca ground. Due to that I think the relay is not coming on and amp even though comes on led remains in protection. Once relay is removed protection goes and has good output on the relay points. Pictures attached.
Attachments
Did you reinstall the relay?
Do you have rail-rail oscillation in all of the output FETs?
If so, do you have modulation on that oscillation when you drive a signal into the amp?
Do you have rail-rail oscillation in all of the output FETs?
If so, do you have modulation on that oscillation when you drive a signal into the amp?
Yes I installed the relay. This is using using IRFI4019H 5pin dual Moffets. Yes it has good oscillations on gates of these dual fets.
But gate oscillations are not modulating on signal. This is using irs2092s ic.
But gate oscillations are not modulating on signal. This is using irs2092s ic.
Do you have rail-rail oscillation?
Do you have signal reaching thew resistor that feeds terminal 3 of the irs2092s?
Do you have signal reaching thew resistor that feeds terminal 3 of the irs2092s?
Yes I have rail to rail oscillations. I am seeing signal reaching the IC only if relay is removed.
Are you saying that audio is reaching the IC but there is no modulation of the rail-rail oscillation?
The signal reaching ic is not stable. After I removed the relay I checked the oscillations and it has modulation. But the signal that reaching ic is not stable at all. But I am having good sinewave output before relay that is just after coils
The 'unstable' audio is a product of the error correction of the IC.
Jump one channel at a time to see if it's one or both channels causing the amp to go into protect.
What's the DC offset of each channel at the input to the relay?
Jump one channel at a time to see if it's one or both channels causing the amp to go into protect.
What's the DC offset of each channel at the input to the relay?
Amp goes into protect even without signal. So both channels is same. Black probe on terminal ground it has -4.3v on relay input side. Same on both channels.
With black probe on shield without having rca jacks it is -0.015v one channel and 0v on another channel.
The RCA shield isn't a reliable reference from one amp to another. Measure the offset directly across the speaker terminals for each channel.
Check with the RCA source (grounded shield) plugged in and not plugged in.
Check with the RCA source (grounded shield) plugged in and not plugged in.
With and without the shields grounded?
What's the resistance between the primary ground and the non-bridging speaker terminals?
What's the resistance between the primary ground and the non-bridging speaker terminals?