I checked all resistors on 1 board so far and the diodes they all test fine .
Now I’m testing the caps and transistors .
Could the MIC4420 on the board be bad or not likely since I have good drive signal
Now I’m testing the caps and transistors .
Could the MIC4420 on the board be bad or not likely since I have good drive signal
Not likely but I don't have much information on this board. I drew a diagram for it at one time but I can't find it.
So either 1 of the transistors is leaking electronically since they test good or the A2611 is defective .
I have new A2611’s here I will try to find some new transistors . Or is there a good sub for them do you happen to know ?
C3027 A1070
I have new A2611’s here I will try to find some new transistors . Or is there a good sub for them do you happen to know ?
C3027 A1070
IT's not likely that the 2611 is defective.
Did you check the transistor on ohms for reverse leakage in all lead configurations?
Did you check the transistor on ohms for reverse leakage in all lead configurations?
Yes checked the transistors in ohm setting on all configurations the readings were in the mega ohms between the legs
The transistors checked fine I also found a junk board and replaced the transistors on both driver boards .
Problem is still there I have 50 volts of dc measured directly across the speaker terminals
Problem is still there I have 50 volts of dc measured directly across the speaker terminals
If you connect the lamp across the speaker terminals, what's the DC voltage from each terminal to ground and what's the DC voltage across the lamp?
Is there a good replacement for the A1070 and C3027? That’s the only thing left on the boards I didn’t replace with new parts and have the same issue with voltage on the speaker terminals so either those transistors are defective some how or the mic 4420’s on theirs boards are defective .
Or the problem is on the main board .
I have no clue where the voltage is coming from .
With the boards out there is no voltage across the speaker terminals . And soon as I solder the boards back in the amp the voltage returns
Is there anyway to check the 4420’s on the board like the 21844’s?
Or the problem is on the main board .
I have no clue where the voltage is coming from .
With the boards out there is no voltage across the speaker terminals . And soon as I solder the boards back in the amp the voltage returns
Is there anyway to check the 4420’s on the board like the 21844’s?
If you connect the lamp across the speaker terminals, what's the DC voltage from each terminal to ground and what's the DC voltage across the lamp?
With the lamp connected across the speaker terminals I get
97.4 volts from positive speaker terminal to ground
97.6 from ground speaker terminal to ground
And 0.00 volts measured directly across speaker terminals when lamp is connected across them
97.4 volts from positive speaker terminal to ground
97.6 from ground speaker terminal to ground
And 0.00 volts measured directly across speaker terminals when lamp is connected across them
There may not be a problem. I've never measured the DC voltage on the speaker terminals unless the amp was up and running.
Did you order the right gate resistors when you ordered the new outputs?
Did you order the right gate resistors when you ordered the new outputs?
Yes I ordered the 22.1 ohm resistors .
I still have used outputs for this amp can I put them in the amp for testimony to see if I have any other issues ?
And I have 2 different date codes on the used outputs .
The low side outputs are Q500,501 and 506,507?
I still have used outputs for this amp can I put them in the amp for testimony to see if I have any other issues ?
And I have 2 different date codes on the used outputs .
The low side outputs are Q500,501 and 506,507?
I’m gonna set this amp aside I’m back to square one with it .
I installed the outputs back in the amp the used ones which I fully tested before installing them .
The outputs get hot after a few secs and the amp draws current .
I guess I will wait til the new outputs come in and look at the drive signal before installing them
I installed the outputs back in the amp the used ones which I fully tested before installing them .
The outputs get hot after a few secs and the amp draws current .
I guess I will wait til the new outputs come in and look at the drive signal before installing them
I got the amp to power up and produce clean audio finally .
I noticed the power led doesn’t light up now .
Any ideas what transistor or diode controls this ?
The led is fine I tested it and it works so something in the amp is not working
I noticed the power led doesn’t light up now .
Any ideas what transistor or diode controls this ?
The led is fine I tested it and it works so something in the amp is not working
