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Search: Posts Made By: jason123
Forum: Troubleshooting Audio Equipment 06-27-2022, 11:48 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

BD3471KS2 seems to be pin-compatible. Rohm is not much of a help. So it's a chance.

I don't have a datasheet for the original part BD3470KS2, except the schematic sheet in the manual for the...
Forum: Troubleshooting Audio Equipment 06-23-2022, 09:54 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Unfortunately, IC400 has been removed off the board. The good news, it was removed successfully. Awaiting a replacent
Forum: Troubleshooting Audio Equipment 06-20-2022, 10:21 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Thank you so much again!

So here are the videos with BoxDrop links earlier in the thread, very shrunk with removed audio. Let's hope they upload
Forum: Troubleshooting Audio Equipment 06-20-2022, 05:44 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

I went for it. BD3471KS2 seems to be pin compatible and available from Aliexpress... will be a month before it gets here but i will keep you posted!

As for heating / freezing the IC, It's on the...
Forum: Troubleshooting Audio Equipment 06-20-2022, 05:38 AM
Replies: 87
Views: 1,614
Posted By jason123
Forum: Troubleshooting Audio Equipment 06-19-2022, 01:21 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

I am ok with soldering. As for the channel levels i am not sure what you mean? I never really used the unit, so i have to hit the manual.

Yes the IC400 IS BD3470KS2... not available anywhere it...
Forum: Troubleshooting Audio Equipment 06-19-2022, 08:32 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Ok,
So hopefully this takes care of things:

People preferred images rather than video so I'm attaching an image. Still amplitude jitter is occurring on pin 14 of IC400

Channel 1 input (large...
Forum: Troubleshooting Audio Equipment 06-19-2022, 07:59 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Probe set is fairly new. Just to confirm I just swapped existing setup, and the amplitude jitter is there. It's audible with speakers and headphones and referred to it as a "Distortion" as I didn't...
Forum: Troubleshooting Audio Equipment 06-18-2022, 10:19 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Thank you... i understand now. I will try to tap into those in the morning
Forum: Troubleshooting Audio Equipment 06-18-2022, 02:45 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

I attempted to upload! Max video aize allowed is too small for all conversion formats . All uploads resulted in failures. I will keep trying
Forum: Troubleshooting Audio Equipment 06-18-2022, 12:30 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

I've looked at pin 75 and 76.. they're labeled ADCRout, ADCLout... I know the sine waves are not "digital" output :) bad assumption on my part.. But I'm referring to pin 75 and 76.

Is there a...
Forum: Troubleshooting Audio Equipment 06-18-2022, 11:54 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Not sure I'm clear on the ask here.

I think I've exhausted the resistance measurement and visual inspection - if something is wrong, I'm just not seeing it.

As to the IC400... BD3470KS2... Any...
Forum: Troubleshooting Audio Equipment 06-18-2022, 11:14 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Ok, here is the scope capture video of the 75 (Channel 3) and 76 (channel 4) pins. Tapped into the C546 / C547 caps vs. actual pins - just for clarity.

DAC outputs seem good ? ? just sine wave,...
Forum: Troubleshooting Audio Equipment 06-18-2022, 10:31 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

I don't mind drilling further.. I'll tap into 75 / 76 pins of IC400.

My comment on Volume control is based on page 17 of the manual and block diagram of the IC. Seems volume data & Volume clock...
Forum: Troubleshooting Audio Equipment 06-18-2022, 09:53 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

I have selected straight through (A. Direct ?) and same result. Just for my understanding, IC400is what adjusts gain of signal going to amplifier. So if IC400 gain adjustment jumps from zero to...
Forum: Troubleshooting Audio Equipment 06-18-2022, 09:32 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Confused a bit here.. are you suggesting that input is not coming to the proceesor right, maybe? Due to damage in the SA-CD / CD circuit? So i can test this by testing a different input path (Say TV...
Forum: Troubleshooting Audio Equipment 06-17-2022, 09:33 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Ok...removed c710 and tapped into the IC400 Pin 14. Though amplitude unloaded is lower, it shows the same amplitude jitter and no change to amplitude with Volume up.

Seems IC400 needs to be...
Forum: Troubleshooting Audio Equipment 06-17-2022, 08:36 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

C710 replaced no change.
Removing it now
Forum: Troubleshooting Audio Equipment 06-17-2022, 06:40 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Source is a function generator into 50 ohm load routed to SA-CD/CD. note the signal gets to all channels fine except FL (Bad channel)
Cap tested ok with a cap meter. Would a bad cap result in no...
Forum: Troubleshooting Audio Equipment 06-17-2022, 06:06 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

So I tapped into the following pins of IC701:
FL bad Channel:
Pin 2 Vout1+
Pin5 NF1
Pin 6 IN1 (directly from the microprocessor IC400 Pin 14 FLOUT, page 32)

FR Good Channel:
Pin 12 Vout2+...
Forum: Troubleshooting Audio Equipment 06-17-2022, 05:36 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Ok, so here is a movie of what's happening. Channel 1 is a beautiful sine wave 300 mV pk.

Channel 2 is connected to FL (Bad Channel) + pin (speaker out +)
Video starts at Volume level 1 out of...
Forum: Troubleshooting Audio Equipment 06-17-2022, 02:23 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

So scope lead is looking at + pin of a speaker and the ground lead connected to chassis of the amplifier. We're not looking at the - speaker out, but I'll just run the test twice one with positive...
Forum: Troubleshooting Audio Equipment 06-17-2022, 01:35 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Working on this. Just a quick clarification question.. the speaker output is what I was going to connect to the oscilloscope. The - output is not connected to ground / Com on the amplifier. Is it...
Forum: Troubleshooting Audio Equipment 06-17-2022, 08:44 AM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

Started with impedance measurement around IC701. All impedance measurements were referenced to pin 7 (gnd). No significant differences between IC601. Some pins had caps so impedance was...
Forum: Troubleshooting Audio Equipment 06-16-2022, 05:59 PM
Replies: 87
Views: 1,614
Posted By jason123
Re: Sony STR-DN1030 Distorted audio when Volume adjusted

So, one additional observation that may mean something to you: when the system is playing, Volume level 1 for this FL channel is very high compared to the other channels that you can barely hear...
Showing results 1 to 25 of 500

 
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