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[Fernando Lucchesi]

Hey, guys. How are you doing?

So, recently an old Sennheiser EW135 of mine starting to give me a headache.

It works fine for some time, then it randomly starts to re-sync, it does that for about 10 seconds, re-sych, then it starts all over again and keeps doing that infinitely. I tried changing batteries, turning if off and on, but the only way to fix it is to let it sit for the night and voilà, it works fine the next day until it starts doing that all over again. When it starts doing that it won't allow me to change between banks or to scan for new frequencies, it just keeps syncing and syncing non stop.

It's not a position related problem since it happened in venues 500 miles apart from each other, plus, my other Sennheiser EW135 works just fine simultaneously under the same conditions.

Do you guys have any thoughts on what could it be?

Thanks!

[Scott Holtzman]

Do you guys have any thoughts on what could it be?

Thanks!

It's broken?

[Fernando Lucchesi]

Nope. It is working fine right now. But eventually it'll start the sync loop



Enviado de meu Lenovo A6020l36 usando Tapatalk

[Scott Holtzman]

Nope. It is working fine right now. But eventually it'll start the sync loop



Enviado de meu Lenovo A6020l36 usando Tapatalk

Clearly the humor didn't translate.  Working sometimes is still broke.  It could be anything from transient interference to a marginal power supply.

[Fernando Lucchesi]

Clearly the humor didn't translate.  Working sometimes is still broke.  It could be anything from transient interference to a marginal power supply.

So I'm pretty much screwed? Would it be within the reach of an average electronic  technician's knowledge or should I Just sell it as scrap since there's not a sennheiser's maintenance shop in a 3,000 miles radius?

Enviado de meu Lenovo A6020l36 usando Tapatalk

[Scott Holtzman]

You don't even know it's broke.  Could just be interference.  What troubleshooting steps have you taken?

What is your role in all of this?

This is a forum, professionals helping professionals.  It's not free tech support.


Sent from my SM-N930V using Tapatalk

[Fernando Lucchesi]

You don't even know it's broke.  Could just be interference.  What troubleshooting steps have you taken?

What is your role in all of this?

This is a forum, professionals helping professionals.  It's not free tech support.


Sent from my SM-N930V using Tapatalk

I tried changing frequecies, Banks, antennas, Power cord, position, af values, squelch, pilot tone. I rent and operate these equipments. Unfortunately my maintenance skills don't Go  far beyond replacing a busted capacitor, so I'm trying to assess wheter this is a common occurence among these products and if its repair would be a logistical nightmare.

Enviado de meu Lenovo A6020l36 usando Tapatalk

[Scott Holtzman]

I tried changing frequecies, Banks, antennas, Power cord, position, af values, squelch, pilot tone. I rent and operate these equipments. Unfortunately my maintenance skills don't Go  far beyond replacing a busted capacitor, so I'm trying to assess wheter this is a common occurence among these products and if its repair would be a logistical nightmare.

Enviado de meu Lenovo A6020l36 usando Tapatalk

Ok, I was being a bit frívolo in my replies.  "Actitud divertida" is one of the first things that gets lost in translation.  You didn't provide much data in your first post so I was trying to coax more out of you.


It sounds like you have more than covered your options and a trip back to Sennheiser may be inevitable.

[Fernando Lucchesi]

It's alright. I'm Sorry if I Look like a bum jumping in and asking for free tech support. Like I Said, my maintenance skills don't Go very far and I thought maybe I was missing something simple, so why not asking before sending my mic on a 9 month trip? Lol. I'm at bit Lost, I had a partner Who's an old friend of mine that used to take care of the most technical side of things. Unfortunately I had to let him Go last month after he developed a bad habit of getting drunk and sleeping during gigs, so I'm a little overwhelmed right now by the ammount of unfinnished work he left under the rug. I wish I could help more in the forums, but I still got a lot of Rust to scrape before I can do anyone any good. Well, anyway, thanks a lot for the help. I'll make sure to update the Post about the outcome of the mic, in case someone stumbles Upon the same issue

Enviado de meu Lenovo A6020l36 usando Tapatalk

[Scott Holtzman]

It's alright. I'm Sorry if I Look like a bum jumping in and asking for free tech support. Like I Said, my maintenance skills don't Go very far and I thought maybe I was missing something simple, so why not asking before sending my mic on a 9 month trip? Lol. I'm at bit Lost, I had a partner Who's an old friend of mine that used to take care of the most technical side of things. Unfortunately I had to let him Go last month after he developed a bad habit of getting drunk and sleeping during gigs, so I'm a little overwhelmed right now by the ammount of unfinnished work he left under the rug. I wish I could help more in the forums, but I still got a lot of Rust to scrape before I can do anyone any good. Well, anyway, thanks a lot for the help. I'll make sure to update the Post about the outcome of the mic, in case someone stumbles Upon the same issue

Enviado de meu Lenovo A6020l36 usando Tapatalk

Not a problem at all.  Sounds like you are not having fun at all.  Just because I could not think of anything doesn't mean someone else might not have an idea.

I was just the first responder

[Fernando Lucchesi]

It has began, after a couple of hours turned on



Enviado de meu Lenovo A6020l36 usando Tapatalk

[Fernando Lucchesi]

Given the time is takes to start failing, could it be related to some component overheating?

Enviado de meu Lenovo A6020l36 usando Tapatalk

[Fernando Lucchesi]

So I decided to take a peek under the Hood and this is what I found

[Jason Glass]

You might want to try re-flashing the firmware before sending it in for repair.

Sent from my mobile phone. Please excuse the inevitable spelling and grammatical errors.

[Cameron Stuckey]

Side-bar: Sennheiser really does not want you knowing what those chips are, those look to be scraped by hand.

[Ike Zimbel]

Given the time is takes to start failing, could it be related to some component overheating?

Enviado de meu Lenovo A6020l36 usando Tapatalk

I would open another one and see if that component that looks like it leaked goo all over the board looks the same or similar. I can't quite make it out but is most likely an electrolytic cap that went bad. A picture of a good board would help clarify things (or, you may find that you have other units that are on the verge of the same failure).
On the repair side, you can try and clean the goo off with a some isopropyl alcohol and a cotton swab (probably many swabs), Between that and figuring out what that component is, you might have a chance of fixing it. If not, those 700MHz systems are all illegal in North America, so there may be folks here who would happily sell you a replacement. I had a client just a couple of months ago who had one...said he was going to toss it but maybe he never got around to it.

[Fernando Lucchesi]

Here it is. The fine working fellow.



Enviado de meu Lenovo A6020l36 usando Tapatalk

[Fernando Lucchesi]

Enviado de meu Lenovo A6020l36 usando Tapatalk

[Scott Holtzman]

Enviado de meu Lenovo A6020l36 usando Tapatalk

Clean the board with some flux stripper and replace that cap.  It will probably work gooder.

Hard to believe that tiny cap had that much goo in it. (maybe they used a Tardes cap by accident)

[ProSoundWeb Community]