DIY Repair of Marantz SR8015, no audio on any channels

[bo_knows]

** UPDATE ** One month on . . . see below for faulty component tear down. High voltage carnage!

Prompted by a Denon AVR repair I read on another forum, I decided to cut open the ECO relay I replaced. Oh boy, the carnage is real.
Hopefully the Carbon deposits are obvious in the photo (it shouldn't look like that) but they are only a bi-product of the very obvious arcing and destruction of the high voltage contact pair. In comparison, the low voltage side (ECO mode on) look pristine.
I will be sourcing a more robust replacement relay with better contact materials and treatment.
Looks like I get to pull this all apart one more time

View attachment 432840

Excellent work! Please keep us posted.

I'm wondering if the top of the line A1H AVR/AVC contains these sub parts or they were upgraded.

I don't think we have any presence of Denon/Marantz engineers on this forum to chime in.

How could we reach out to provide them with the feedback? I assume they get notified via service centers around the world with this type of issue.

 

[Doodski]

How could we reach out to provide them with the feedback? I assume they get notified via service centers around the world with this type of issue.

When a warranty claim is full filled and the paperwork is sent to the manufacturer the old failed part is tossed in the garbage or sometimes returned but often times it is spot checks in failed parts returns to ensure the depot is not scamming warranty parts.

 

[bo_knows]

I will also assume that parts are carefully chosen to meet the warranty period.

Most of those AVRs have up to 3 years warranty and only A1H has 5 (that I'm aware of).

The engineering sheet for the part will most likely list the life span of the part.

 

[Doodski]

I will also assume that parts are carefully chosen to meet the warranty period.

Most of those AVRs have up to 3 years warranty and only A1H has 5 (that I'm aware of).

The engineering sheet for the part will most likely list the life span of the part.

The service depot might open the relay out of curiosity but mostly they just slap in the new part and test for proper operation and call it a day. They don't concern themselves with data sheets and MTBF specs.

 

[bo_knows]

The service depot might open the relay out of curiosity but mostly they just slap in the new part and test for proper operation and call it a day. They don't concern themselves with data sheets and MTBF specs.

I was thinking more like an engineer who designed the power supply board vs a service center tech.

 

[Doodski]

I was thinking more like an engineer who designed the power supply board vs a service center tech.

That is the thing though. Engineering reports require paperwork and time from the service depot and then follow up and action reports etc. It's a pain in the butt. Easier to just mind one's own business and stay out of politics. Replace the part, toss it and go to the next repair and stay out of the business matters.

 

[Maxpower]

So sorry; looks like Marantz really underestimated the employment/use of this relay. But from your previous postings, it seems like you kind of anticipated this also. Maybe Marantz engineers should have anticipated this deficieny also - maybe they did? - if so, shame on them for not insisting on a more robust relay module. I don't know - please correct if I'm wrong with this idea.

Yeah, thank you . . . and no worries. At least I can pick my timing for the rework over the next month or so.
You raise a good point about the relay choice. What is confusing me a little is, the PCB has an accommodation for a more significant relay, but the Marantz part number is for this 'smaller' relay. Given that unit came out of the factory during COVID . . . I wonder if there was a supply chain issue and they could not obtain the original spec?
We'll never know I guess.

 

[Maxpower]

Excellent work! Please keep us posted.

I'm wondering if the top of the line A1H AVR/AVC contains these sub parts or they were upgraded.

I don't think we have any presence of Denon/Marantz engineers on this forum to chime in.

How could we reach out to provide them with the feedback? I assume they get notified via service centers around the world with this type of issue.

Yeah, I am really hoping that is case. Especially when you're paying for the premium models. When I get a chance, I'll go back and look at the version 1 of the SR8015, before they made the hardware changes for the HDMI 2.1 bug. Maybe the original Relay was larger? COVID supply chains issues may be at the heart of this.

 

[oupee]

If you don't use ECO mode (me), you can throw the relay away completely. I'm attaching the service manual.

MARANTZ SR 8015 SERVICE MANUAL Pdf Download

View and Download Marantz SR 8015 service manual online. AV Surround Receiver. SR 8015 receiver pdf manual download. Also for: Sr8015/u1b, Sr8015/n1b, Sr8015/n1sg, Sr8015/k1b, Sr8015/fb.

www.manualslib.com

 

[AA95101]

Whats the part number for the eco relay? did you end up replacing it with a new single relay or 2x relays? thanks

 

[kenwin67]

I’m doing this right now on a SR8012 (seems to be identical issue and PCB layout).

Any news on the ECO relay?

Recommendations on a substitute to the factory relay?

And the 2 relay solution?

Before tearing down the 8012, would be great to have both Vishay bridge rectifiers and the relay(s) set

Original relay seems to be:
Relay S-6001 (FTR-F1CL01-2R)

https://www2.mouser.com/new/fcl-components/fujitsu-ftr-f1-power-relays/

Great work Maxpower!

PS! Played around with ECO mode ON/OFF. With ECO OFF the DC protection circuit switched 8012 off after 10 mins. ECO ON and SR8012 works flawless (been running it for 7 hours now, both movies and music!). So in my case it seems the ECO relay high AC side (and maybe the high AC bridge rectifier) are bad.
Will replace both bridge rectifiers but the relay I'd be happy if Maxpower or anyone else could guide on a better one than the original!

 

[kenwin67]

Here's the spec on the ECO relay (Fujitsu, FTR-F1CL01-2R, Coil12V, 8A):

https://4donline.ihs.com/images/VipMasterIC/IC/FUJM/FUJMS01744/FUJMS01744-1.pdf?hkey=FB3F1F3F2A09A989A6BF9D772C3B8264

Talked to official Denon/Marantz workshop technician here in Sweden and he said this Fujitsu relay is used in many other products (especially with ECO function) so I guess there's no other (better) alternative.

PS! Anyone aware of which relay is close to the SMPS PCB that clicks when you turn on the unit?
Planning to change that one too, since I'm aware of one other SR8012 user here in Sweden, that can't switch off his unit due to fault with this relay.

 

[kenwin67]

Finally, replaced ECO relay and the 2 bridge rectifiers and now it's back in business again.

Opened up the relay and it was of course burnt out on the high AC contact side.

Note that you can lift out all PCB's in one piece with the back panel (described in the SR8012 service manual page 80-81) and get access to the power/speaker PCB, replacing relay/bridges.
Took only 2 hours to do the complete work

 

[bo_knows]

Here's the spec on the ECO relay (Fujitsu, FTR-F1CL01-2R, Coil12V, 8A):

https://4donline.ihs.com/images/VipMasterIC/IC/FUJM/FUJMS01744/FUJMS01744-1.pdf?hkey=FB3F1F3F2A09A989A6BF9D772C3B8264

Talked to official Denon/Marantz workshop technician here in Sweden and he said this Fujitsu relay is used in many other products (especially with ECO function) so I guess there's no other (better) alternative.

PS! Anyone aware of which relay is close to the SMPS PCB that clicks when you turn on the unit?
Planning to change that one too, since I'm aware of one other SR8012 user here in Sweden, that can't switch off his unit due to fault with this relay.

So this means all of those products will/could eventually face this type of slow death. Well, my Denon AVC 8500H for sure failed because of it.

 

[kenwin67]

According to the relay data sheet...

FTR-F1CL012R

...there's a life curve chart so there's an end of life after a certain amount of operations (dependent on current).

Whether Denon/Marantz miscalculated this in their design or not I can't say, but I've used my SR8012 everyday for 5 years (minimum ~2000 operations) so @ 6A I should have used less than 10% of the operations.
So there's something not right in the design.
Note that with ECO mode set to auto, the operations could be significantly higher.

 

[bo_knows]

According to the relay data sheet...

FTR-F1CL012R

...there's a life curve chart so there's an end of life after a certain amount of operations (dependent on current).

Whether Denon/Marantz miscalculated this in their design or not I can't say, but I've used my SR8012 everyday for 5 years (minimum ~2000 operations) so @ 6A I should have used less than 10% of the operations.
So there's something not right in the design.
Note that with ECO mode set to auto, the operations could be significantly higher.

View attachment 482086

I would assume that damage is caused by the amount of current that the contact sees. The maximum rating is specified as 8Amps. Wondering in what conditions this relay would see current close to or in excess of 8amps.

 

[zexoni70]

According to the relay data sheet...

FTR-F1CL012R

...there's a life curve chart so there's an end of life after a certain amount of operations (dependent on current).

Whether Denon/Marantz miscalculated this in their design or not I can't say, but I've used my SR8012 everyday for 5 years (minimum ~2000 operations) so @ 6A I should have used less than 10% of the operations.
So there's something not right in the design.
Note that with ECO mode set to auto, the operations could be significantly higher.

View attachment 482086

I came across this topic and it interested me because I have a Denon AVC-X6700H manufactured in July 2023 (data from the serial number of the device).

Now, since the beginning of using the device, I have been using ECO mode and I set it to Automatic and as far as I understand you, that mode is the best...?

Wouldn't the problem with the relay and its failure occur if ECO mode were constantly turned off, and is that a better or best option?

Since the first day of purchase, I have installed a Noctua NF-A20 PWM chromax.black.swap fan on the Denon to extract warm air out of the device (I already wrote about it in this thread), so does that possibly extend the life of the device and that ECO relay?

Thanks!

 

[bo_knows]

I came across this topic and it interested me because I have a Denon AVC-X6700H manufactured in July 2023 (data from the serial number of the device).

Now, since the beginning of using the device, I have been using ECO mode and I set it to Automatic and as far as I understand you, that mode is the best...?

Wouldn't the problem with the relay and its failure occur if ECO mode were constantly turned off, and is that a better or best option?

Since the first day of purchase, I have installed a Noctua NF-A20 PWM chromax.black.swap fan on the Denon to extract warm air out of the device (I already wrote about it in this thread), so does that possibly extend the life of the device and that ECO relay?

Thanks!

View attachment 482123 View attachment 482124

I don't think the fan on the top of your AVR will extend the life of THIS device. Your AVR is already sitting on the top of the shelf.

Amir measured the maximum temperature of the largest Denon receiver (A1H) to be 52 °C.

This relay can handle an additional 20 °C (according to the spec sheet).

IMHO, the current is the main culprit of the failure.

Here are the specs again: