Hello diyaudio family
Can anyone tell me what the voltage regulators that drive the irs21844 driver of the 3000.1D device are?
The 21844 uses a 12v supply. Are those un-marked/unreadable?
Are you sure those feed the 21844 ICs?
Are you sure those feed the 21844 ICs?
this is the driver card
The internals were installed as 21844, but one of the regulators in the area I marked was KIA7805 and the other was 7812, I do not think these are correct.
There appears to be a damaged via on the driver board header. This needs to be addressed before the amp is powered up after reassembling the amp.
Are the regulator outputs connected to the supply pins of the 21844s?
Or do their outputs connect to the power supply pins of the TL072 and LM211 on the driver board?
Are their output terminals directly connected to each other?
Do their solder connections appear to be OEM/flow-soldered?
Are the regulator outputs connected to the supply pins of the 21844s?
Or do their outputs connect to the power supply pins of the TL072 and LM211 on the driver board?
Are their output terminals directly connected to each other?
Do their solder connections appear to be OEM/flow-soldered?
TL072 LM211 LM2903 on the driver card all changed
One of the regulator goes to the supply pin of 21844
Does the 5v regulator power the TL072?
Does that 12v regulator feed both 21844s?
What are the components, directly across, on the other side of the board?
Does that 12v regulator feed both 21844s?
What are the components, directly across, on the other side of the board?
I will report back after making the necessary checks. Also, should there be -12v on the com pin of 21844 or should it be gnd?
5v regulator powers TL072
12v regulator feeds both 21844s
The components on the other side of the card feed 7915 7815 TL084CN and they are working properly.
ho and lo are actively working
both relays turn on
The problem is that I can't get any sound.
12v regulator feeds both 21844s
The components on the other side of the card feed 7915 7815 TL084CN and they are working properly.
ho and lo are actively working
both relays turn on
The problem is that I can't get any sound.
Unfortunately, I need an oscilloscope to see the waveform, and I don't have it.
After connecting the RCA connection, I hear the scratchy bass sound when I touch the components around the TL084 with my finger.
After connecting the RCA connection, I hear the scratchy bass sound when I touch the components around the TL084 with my finger.
ho and lo are actively working
^^^ What did you mean by that? I assumed that you meant the high and low-side drive from the driver board.
What test equipment do you have?
^^^ What did you mean by that? I assumed that you meant the high and low-side drive from the driver board.
What test equipment do you have?