Not sure I let it sit and did nothing to the amp besides replace the nds9952a's is all I did to the amp.
R848 in the amp i have here is a 91K ohm resistor and it measures 91.2K
replaced U800 LM393
Get the same results.. Low ohms light is on and no pulses anywhere..
The drivers are marked 2C or ZC Can i try replacing them with 1A's to see if that helps anything?
replaced U800 LM393
Get the same results.. Low ohms light is on and no pulses anywhere..
The drivers are marked 2C or ZC Can i try replacing them with 1A's to see if that helps anything?
The ZC and 1A are used in the same location in various amps.
Does R848 appear to be original or has it been replaced?
Does R848 appear to be original or has it been replaced?
Confirm that it's connected to pins 7 and 2 on one end and the 3rd leg of the 5v regulator (U802).
I just noticed, pins 2 and 7 had different voltages in post #79. That means that they may not be constant.
Are the rest of the voltages on that IC the same as in post #79?
Are the rest of the voltages on that IC the same as in post #79?
Replace the 10k jumper resistor with a 1k resistor. Does that pull it up to 5v?
Do you see any corrosion or anything conductive in that area?
If the voltage doesn't get pulled up to very near 5v with the 1k resistor, remove the 393 and re-post the voltages.
Do you see any corrosion or anything conductive in that area?
If the voltage doesn't get pulled up to very near 5v with the 1k resistor, remove the 393 and re-post the voltages.
with the 1k resistor in place and the 393 removed heres what i get
Pad 1:4.91
Pad 2:3.84
Pad 3:0.80
Pad 4:0.00
Pad 5:4.90
Pad 6:0.44
Pad 7:3.84
Pad 8:12.59
Pad 1:4.91
Pad 2:3.84
Pad 3:0.80
Pad 4:0.00
Pad 5:4.90
Pad 6:0.44
Pad 7:3.84
Pad 8:12.59
No
I measured the voltage on both sides of the 1k resistor and the 9.1k where you told me to solder a 1k resistor across it..
1 side i get 3.84 volts
The other side is 4.91 volts..
Should i unsolder both of them and see if i can find a 7.5k resistor and solder it in to see if the voltage goes up?
I measured the voltage on both sides of the 1k resistor and the 9.1k where you told me to solder a 1k resistor across it..
1 side i get 3.84 volts
The other side is 4.91 volts..
Should i unsolder both of them and see if i can find a 7.5k resistor and solder it in to see if the voltage goes up?
Remove the IC and measure the voltage on its pins without the jumper resistor.
You wrote 9.1k here but 91k previously. Which is correct?
You wrote 9.1k here but 91k previously. Which is correct?
- Status
- Not open for further replies.