Yamaha DXR15 Powered Speaker Fault LED On

[MobileXT]

Another updates: I install the parts I get sound but another problem. I don't have high I test the tweeter is good.

[CapLeaker]

check if there is audio going to the TDA8922. Maybe the mute is on somehow, no VSS, no oscillator, something open in the output, etc.

[R_J]

I have a shorted on the IC713 and IC715 both on PIN 6 & 7 so I ordered the parts from Mouser NJM2068M-D hopefully will get here by next week. Once I get the parts I will update you guys.

IC713 has a 0Ω resistor (R897) across pins 6 & 7, IC 715 pin 6&7 are connected together (section of ic not used)

[MobileXT]

check if there is audio going to the TDA8922. Maybe the mute is on somehow, no VSS, no oscillator, something open in the output, etc.

That's what I thought it could be mute somewhere so I am looking at Q256 and Q257 as well as the IC724.I am still waiting for my oscilloscope. I already did replaced the TDA8922 that from China it could be faulty that's why have the same problem no audio output.

[MobileXT]

I check the Audio output at IC724 at Pin 1 and Pin 7 and I don't get any audio output. I did also replaced the IC724 and still have the same problem no audio output. The power supply is okay I have +15v at Pin 8 and -14.84v at PIN 4 Look Like DSP IC702 is no audio output at PIN 34,33 & 35 ,36 . I do have audio output @ PIN 29,30 & 31,32 which is the LF output.

[MobileXT]

check if there is audio going to the TDA8922. Maybe the mute is on somehow, no VSS, no oscillator, something open in the output, etc.

No Audio going to the the TDA8922.

[CapLeaker]

Oyyy… it went as far as the DSP? Dayum! That sux!

[MobileXT]

Updates: I replaced the the DSP IC702 from mouser.com and still have the same problems. Still no audio going out to the HF. So the problem is not the DSP IC it could be on the input but I do have output for the LF. Is not the Amp board because I installed the brand new one. Any suggestions greatly appreciated.

[CapLeaker]

This doesn’t make any sense to me. If no HF is coming out of the DSP, it’s either damaged, not programmed or something turned off. I suppose you could disconnect some traces and jumper in the LF out of the DSP over to the HF. Usually you just can’t swap a DSP out and call it good. It needs to be programmed or a firmware update done. The HF enable is having the same status as the LF enable (PA boards)?
Problem can’t be in the input if LF is working. Look at the diagram.

[MobileXT]

I know this is not make sense to me either. I was planning that too jumper from the LF I plan to removed the IC724 and run a jumper. Yes! you can replace the IC702 without programming because I did that with my other speakers and working good so far and everything working HF, LF and D-contour. The IC701 is the one controlling all the programing into this DSP. So I am guessing that the IC701 is also defective but this one need to re-program for sure. So my last options is to run a jumper from the LF to the HF.

[MobileXT]

I am also planning to swap the DSP from the DXR10 to DXR15 since the DSP have all the switch to specific switch to every model. IF I swap the DSP from the DXR10 and turn-on the switch from DRX10 to DXR15 model. What yo guys think?

[madan1]

Do you have to correct sw701 settings and "model type resister" value on pin30/ic701? I guess if the CPU thinks it is a subwoofer, it will not output any HF signal from the dsp..

IF I swap the DSP from the DXR10 and turn-on the switch from DRX10 to DXR15 model. What yo guys think?

Should work even without changing the switch settings.

[MobileXT]

Thanks madan1 I will look into that one but for sure I didn’t touch the sw-701 before but it’s good to know maybe I can turn on turn off the switch 701 maybe some bad connection there. Thanks for confirming the DSP board swap from Dxr8,10 or 12 to dxr15 that will work I don’t have the parts right now but definitely I will look forward on this options and I saw some parts online for the dxr series for parts.

[CapLeaker]

I know this is not make sense to me either. I was planning that too jumper from the LF I plan to removed the IC724 and run a jumper. Yes! you can replace the IC702 without programming because I did that with my other speakers and working good so far and everything working HF, LF and D-contour. The IC701 is the one controlling all the programing into this DSP. So I am guessing that the IC701 is also defective but this one need to re-program for sure. So my last options is to run a jumper from the LF to the HF.

I think you got lucky there. Usually DSP’s including this one are programmable.