I checked R265,R266,R267,R250,R279
R274,R275,R268,R252,R280
Is there something i missed?
No I do not have a scope yet.
For Q220,Q221,Q222,Q223 do I test for voltage passing through? or iam I checking for the one leg of the diode?
You test to make sure that there are no shorted junctions and no open junctions just like any other BJT transistor.
I belive that Q222, and Q223 are bad. They are open both ways on both legs.
Would these be good replacements?
MMBT 3906 LT1 Infineon Technologies | Mouser
SMMBT3904LT1G ON Semiconductor | Mouser
Perry,
I replaced Q220,Q221,Q222,Q223, and iam still getting distortion on the right channel.
The only thing that I havent replaced in the red box's Is C225 and C226. Could these be causing the distortion/static?
I replaced Q220,Q221,Q222,Q223, and iam still getting distortion on the right channel.
The only thing that I havent replaced in the red box's Is C225 and C226. Could these be causing the distortion/static?
Without seeing the distorted waveform on a scope, it makes it difficult to know where to check. At this point, you're left to compare readings between the two channels.
Do you have an amp meter on your 12v power supply?
Do you have an amp meter on your 12v power supply?
No I do not I was looking at new power supplies for something that has one built in but at this time I do not have one.
Do you have any kind of current limiter that you could install in series with the supply?
A large 2 ohm resistor, an old car headlamp...
A large 2 ohm resistor, an old car headlamp...
You will connect the resistors in parallel to each other then the group in series with the B+ wire going to the amp. You will then connect your voltmeter (set to DC volts) across the resistor.
The voltage across the resistor will give you an indication of the current through the resistors.
What is the DC voltage across the resistors at idle?
The voltage across the resistor will give you an indication of the current through the resistors.
What is the DC voltage across the resistors at idle?
Am I trying to see the amperage coming into the amp? Can I put my DDM in series with the B+ wire to get that reading?