Sony TA-N9000ES power amp went in protection mode

adb3da

My Sony TA-N9000ES 5 channel amp went into protection mode today. I think it got too hot in my poorly ventilated cabinet. I want to try leaving the door open while I use it. Is there any way to get this thing out of protection without taking it in to a tech? Any help would be great, I'm stranded at the moment!

tonyb

Unplug it and let it sit for awhile. Cabinets are the absolute worst for electronics. I know they look spiffy and nice, but audio electronics need to breath.
Not sure if there is any fuses on that model, but check anyway.

halo71

I found this....might be helpful....

"The amp I use for my home theater setup (not my primary listening rig) is a Sony TA-E9000ES. Yesterday, I cranked it on and the standby led started flashing indicating protect mode. I disconnect every input and output to confirm there was no shorts across any of the speaker outputs etc. The problem remained. After doing some digging, I came to discover that the common fault in this amp that causes this symptom are 1 of two resistors on the main amplifier pcb, R220 and R221. Both are 1 watt 1 ohm resistors. I measured them in place (which could effect the measurement of course) and found them to be nominally 1.5 ohms. Is it even plausible that a .5 ohm drift (granted, its a huge drift out of tolerance) could cause this thing to go in to protect mode?"

adb3da

halo71 wrote: »

I found this....might be helpful....

"The amp I use for my home theater setup (not my primary listening rig) is a Sony TA-E9000ES. Yesterday, I cranked it on and the standby led started flashing indicating protect mode. I disconnect every input and output to confirm there was no shorts across any of the speaker outputs etc. The problem remained. After doing some digging, I came to discover that the common fault in this amp that causes this symptom are 1 of two resistors on the main amplifier pcb, R220 and R221. Both are 1 watt 1 ohm resistors. I measured them in place (which could effect the measurement of course) and found them to be nominally 1.5 ohms. Is it even plausible that a .5 ohm drift (granted, its a huge drift out of tolerance) could cause this thing to go in to protect mode?"

Thanks, where did you find this? I wonder if replacing those two resistors would get it out of protection?

adb3da

Actually, don't worry about it. I found that thread on diy audio. Unfortunately no replies or follow ups. I'll keep digging the interwebs!

Glen B

R220 and R221 in the TA-N9000ES are 1W fuse resistors in the protection circuit. E-mail me if you want a copy of the service manual.

adb3da

Glen B wrote: »

R220 and R221 in the TA-N9000ES are 1W fuse resistors in the protection circuit. E-mail me if you want a copy of the service manual.

Thanks for the offer but I found that as well. It took a while, but I located those two resistors and have the amp pulled apart to replace them. I also found a place to order the parts. I'm leaving in a few days so I will have to get to this later. Debating on attempting the solder job myself or getting someone more experienced to do it.

mr3klax

Hello. I just joined. My SONY TA-N9000ES goes into protect mode too! Just want to ask if anyone had success in resurrecting their Sony by just replacing the 2 above-mentioned resistors. Thank you very much for any help.

adb3da

mr3klax wrote: »

Hello. I just joined. My SONY TA-N9000ES goes into protect mode too! Just want to ask if anyone had success in resurrecting their Sony by just replacing the 2 above-mentioned resistors. Thank you very much for any help.

I have not gotten around to doing this but it's on my list of things to get done. I found the part online but I haven't ordered it yet. I hope to get it done in the next month or so, but I am going to have someone else do the soldering for me. I did take the top and bottom covers off and was able to locate them. They seems accessible enough for anyone with decent soldering skills.

bollio

So it's a REALLY old thread, but it's one of the few results that come up regarding this. Since no one has posted an actually result to the standby blinking issue I thought I'd share my experience.

I was getting the issue above and figured I'd put a multimeter on the resistors suggested as the problem. Sure enough one was done for (one was showing 1ohm, but the other wasn't showing any resistance). I went to frys electronic around the corner and picked up a pair of 1w 1 ohm resistors for $1.50 and replaced both resisters at r220 and r221, may as well do em both if they're a weak point.

Somehow didn't end up with any extra screws when I put it all back together (always a good sign). Powered the amp up and it started blinking... But this time it stopped after the normal warmup period! Hooked it all up and tested it out and I'm pleased to report this did actually fix the issue!

OldGuy1966

In my case, r220 was open (no continuity). R221 tested OK, but as bollio suggests, might as well replace them both as long as you're there since both seem to be problematic. Back in business...

mrloren

Those are nice amps. I drooled over them when they had them in the Sony family store, just never had the coin to get one.

Viking64

mrloren wrote: »

....just never had the coin to get one.

https://www.youtube.com/watch?v=iZYozMeo7dQ