I do not get any rail to rail oscillation on the outputs .
I checked all of the regulators and all seem to work fine .
I checked all the 47mh inductors all are fine .
I get both positive and negative rail voltages .
Any ideas or common issues with this design of amp as to why it won’t oscillate
I checked all of the regulators and all seem to work fine .
I checked all the 47mh inductors all are fine .
I get both positive and negative rail voltages .
Any ideas or common issues with this design of amp as to why it won’t oscillate
Attachments
I’m gonna try replacing the smd transistors on the audio driver board since some appear a brownish color from heat
Black probe on the negative rail, what's the DC voltage on terminal 2 of the 21844s?
Do you have signal reaching the driver board?
Do you have signal reaching the driver board?
The muting transistor is defective .
It’s marked K30A
So I’m assuming it’s a KSC30A
Do you happen to know if any good replacements for that transistor ?
It’s marked K30A
So I’m assuming it’s a KSC30A
Do you happen to know if any good replacements for that transistor ?
K30A is a jfet. It doesn't read like other transistors.
What do you read 1-2, on ohms?
Then read 2-3 on diode check. Reverse probes and read again.
What do you read 1-2, on ohms?
Then read 2-3 on diode check. Reverse probes and read again.
Any ideas on what I might be able to use ?
Legs1-2:Ol
Legs2-3:1.455
Proves reversed
Legs1-2:OL
Legs2-3:1.455
Legs1-2:Ol
Legs2-3:1.455
Proves reversed
Legs1-2:OL
Legs2-3:1.455
Post a photo of the circuit around the transistor, good enough to read the circuit board designations.
Some similar amplifiers use a J111 in that location. I don't know if this amp will be OK with it. You need to confirm that the muting circuit is working properly.
The rail voltage needs to build to full voltage before the drive begins. See attached.
http://www.bcae1.com/temp/ampstartup01.mkv
http://www.bcae1.com/temp/ampstartup01.mkv
I installed it and amp has no output again .
So either it won’t work in the amp or something is wrong in the muting circuit
So either it won’t work in the amp or something is wrong in the muting circuit