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Author Topic: Schoeps VMS 5U external power problem  (Read 11787 times)

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Offline jbell

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Schoeps VMS 5U external power problem
« on: August 10, 2015, 04:35:40 PM »
I can't seem to get the external power to stay on for an entire show.  I use internal AA's as well so I haven't lost a show.  What happens is after about 10-15 minutes of having the external power on the power light starts to flicker and then shuts off and it switches to internal batteries.  It isn't a cable I have 3 different cables and it happens with all of them.  Could this be a problem with one of the fuses??  Where is the best place to have it worked on state side?? 

Edit: I'm using Tekkeon batteries 3450 and 3300.  The problem occurs not matter which battery I use so I've ruled those out as well.
« Last Edit: August 20, 2015, 06:07:35 PM by jbell »
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Offline StuStu

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Re: Schoeps VMS 5U external power problem
« Reply #1 on: August 10, 2015, 05:36:28 PM »
I can't seem to get the external power to stay on for an entire show.  I use internal AA's as well so I haven't lost a show.  What happens is after about 10-15 minutes of having the external power on the power light starts to flicker and then shuts off and it switches to internal batteries.  It isn't a cable I have 3 different cables and it happens with all of them.  Could this be a problem with ons of the fuses??  Where is the best place to have it worked on state side?? 

Edit: I'm using Tekkeon batteries 3450 and 3300.  The problem occurs not matter which battery I use so I've ruled those out as well.


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Offline H₂O

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Re: Schoeps VMS 5U external power problem
« Reply #2 on: August 10, 2015, 10:12:26 PM »
Have you run it off the wall wart or an external 12v AC adapter?



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Offline jbell

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Re: Schoeps VMS 5U external power problem
« Reply #3 on: August 10, 2015, 10:14:16 PM »
Don't have one

Have you run it off the wall wart or an external 12v AC adapter?
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stevetoney

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Re: Schoeps VMS 5U external power problem
« Reply #4 on: August 11, 2015, 10:22:48 AM »
I can't remember the voltage range for the 5U, but if you're setting your Tekkeon's at the low end of the range, I'd suggest using the voltage more towards the high end of the range.  That's how I run my VMS's to make sure that I don't go below the lower voltage limit in case the batteries sag at all.

Might want to get your meter out and check voltage the tekkeons are giving you when the vms switches over.  Alternatively, the meter on the front of the unit is also a volt meter, so check to make sure your voltage is staying well up in the green zone the whole time before it switches over.  If it dips down towards the red zone before it switches over it's an indication that your external battery is your issue.

Finally, though highly unlikely they're loose, go under the battery cover and make sure the fuses are securely seated.  I suppose in some theoretical way, the fuse in the external circuit could lose continuity when the VMS warms up.

« Last Edit: August 11, 2015, 11:12:43 AM by tonedeaf »

Offline jbell

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Re: Schoeps VMS 5U external power problem
« Reply #5 on: August 11, 2015, 12:29:50 PM »
I'm running the tekkeons at 12V which is recommended, but you can run it as low as 5V so it isn't a battery issue.  A fully charged tekkeon shouldn't sag below 5V after 15 minutes of run time.
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Recorders: Sound Devices Mixpre-10 II | Sony PCM A10

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Offline kingkita

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Re: Schoeps VMS 5U external power problem
« Reply #6 on: August 11, 2015, 01:05:30 PM »
I'm running the tekkeons at 12V which is recommended, but you can run it as low as 5V so it isn't a battery issue.  A fully charged tekkeon shouldn't sag below 5V after 15 minutes of run time.

I seriously doubt your vms is messed up, Tekkeons are nice but not trustworthy, I've had plenty of them work great and ones that where cracp and there plenty of horror stories out there of frying gear. Pop the battery cover off and see if the fuses are still in place.Another thing is the vms pulls power even if you have it on the off position. That's why on some tekkeons you have to set the battery then plug it into the vms then turn the unit on.those where the auto select ones.

Offline jbell

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Re: Schoeps VMS 5U external power problem
« Reply #7 on: August 11, 2015, 01:09:16 PM »
I've used 3 different tekkeons and have had the same issue, but not all the time.  I have it running in front of the stereo now and it is working fine.  At ARU in Athens I had one tekkeon with a full charge that had the low battery light flashing red even though the battery was fully charged.  Maybe I should try my Naztech battery. 

Edit: Been running it for about 45 minutes at home with the tekkeons and can't get the problem to occur.   :hmmm:

I'm running the tekkeons at 12V which is recommended, but you can run it as low as 5V so it isn't a battery issue.  A fully charged tekkeon shouldn't sag below 5V after 15 minutes of run time.

I seriously doubt your vms is messed up, Tekkeons are nice but not trustworthy, I've had plenty of them work great and ones that where cracp and there plenty of horror stories out there of frying gear. Pop the battery cover off and see if the fuses are still in place.Another thing is the vms pulls power even if you have it on the off position. That's why on some tekkeons you have to set the battery then plug it into the vms then turn the unit on.those where the auto select ones.
« Last Edit: August 11, 2015, 01:26:34 PM by jbell »
Mics: DPA ST4011ER & 4018ER
Preamps: DPA MMA 6000 | Audioroot Femto
Recorders: Sound Devices Mixpre-10 II | Sony PCM A10

-20        -12         -6        TDS   (32/48)     
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|Record|  Runtime: 4:19.99  {|||] 75%

Offline kingkita

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Re: Schoeps VMS 5U external power problem
« Reply #8 on: August 11, 2015, 01:37:36 PM »
I've used 3 different tekkeons and have had the same issue, but not all the time.  I have it running in front of the stereo now and it is working fine.  At ARU in Athens I had one tekkeon with a full charge that had the low battery light flashing red even though the battery was fully charged.  Maybe I should try my Naztech battery. 

Edit: Been running it for about 45 minutes at home with the tekkeons and can't get the problem to occur.   :hmmm:

I'm running the tekkeons at 12V which is recommended, but you can run it as low as 5V so it isn't a battery issue.  A fully charged tekkeon shouldn't sag below 5V after 15 minutes of run time.

I seriously doubt your vms is messed up, Tekkeons are nice but not trustworthy, I've had plenty of them work great and ones that where cracp and there plenty of horror stories out there of frying gear. Pop the battery cover off and see if the fuses are still in place.Another thing is the vms pulls power even if you have it on the off position. That's why on some tekkeons you have to set the battery then plug it into the vms then turn the unit on.those where the auto select ones.

Sounds like its the power cable your using then.

Offline jbell

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Re: Schoeps VMS 5U external power problem
« Reply #9 on: August 11, 2015, 01:50:49 PM »
It has happened with 2 different cables!!  Could it be an old fuse causing this behavior?? 

I've used 3 different tekkeons and have had the same issue, but not all the time.  I have it running in front of the stereo now and it is working fine.  At ARU in Athens I had one tekkeon with a full charge that had the low battery light flashing red even though the battery was fully charged.  Maybe I should try my Naztech battery. 

Edit: Been running it for about 45 minutes at home with the tekkeons and can't get the problem to occur.   :hmmm:

I'm running the tekkeons at 12V which is recommended, but you can run it as low as 5V so it isn't a battery issue.  A fully charged tekkeon shouldn't sag below 5V after 15 minutes of run time.

I seriously doubt your vms is messed up, Tekkeons are nice but not trustworthy, I've had plenty of them work great and ones that where cracp and there plenty of horror stories out there of frying gear. Pop the battery cover off and see if the fuses are still in place.Another thing is the vms pulls power even if you have it on the off position. That's why on some tekkeons you have to set the battery then plug it into the vms then turn the unit on.those where the auto select ones.

Sounds like its the power cable your using then.
« Last Edit: August 11, 2015, 02:58:25 PM by jbell »
Mics: DPA ST4011ER & 4018ER
Preamps: DPA MMA 6000 | Audioroot Femto
Recorders: Sound Devices Mixpre-10 II | Sony PCM A10

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|Record|  Runtime: 4:19.99  {|||] 75%

Offline tgakidis

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Re: Schoeps VMS 5U external power problem
« Reply #10 on: August 11, 2015, 02:52:46 PM »
Sounds like its the power cable your using then.

Fucking cable makers  >:(
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Offline jbell

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Re: Schoeps VMS 5U external power problem
« Reply #11 on: August 11, 2015, 02:59:31 PM »
I'm pretty sure it isn't the cable you made Ted.  It was happening with the stock tekkeon cable as well.  I do also realize you're being sarcastic. 

Sounds like its the power cable your using then.

Fucking cable makers  >:(
« Last Edit: August 11, 2015, 03:55:30 PM by jbell »
Mics: DPA ST4011ER & 4018ER
Preamps: DPA MMA 6000 | Audioroot Femto
Recorders: Sound Devices Mixpre-10 II | Sony PCM A10

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|Record|  Runtime: 4:19.99  {|||] 75%

stevetoney

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Re: Schoeps VMS 5U external power problem
« Reply #12 on: August 11, 2015, 02:59:41 PM »
Jon.  Can you get the issue to happen if you wiggle the cable connect ion on the socket?. I've had the socket on one of my recorders go bad on me in the past where one of the connectors inside the socket sorta loosened up so that it wouldn't make reliable connection with both poles.

Offline kingkita

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Re: Schoeps VMS 5U external power problem
« Reply #13 on: August 11, 2015, 04:00:22 PM »
Sounds like its the power cable your using then.

Fucking cable makers  >:(

You know I love ya Ted!

Jon pull the fuse and put another one in it. I've replaced a few it's a pain in the ass I used some small tweezers to do it.Ive just stole the fuses from the battery Side I never run internal batteries with the 5u.Til you get some new ones see if that helps.
« Last Edit: August 11, 2015, 04:05:16 PM by kingkita »

Offline jbell

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Re: Schoeps VMS 5U external power problem
« Reply #14 on: August 11, 2015, 04:01:44 PM »
Today during testing I tried that and it stayed connected.  When the battery has lost connection during a show The battery is setting in the bag not being moved.  Once it loses connection I have done exactly what you are suggestion without success.  If I unplug the battery and then reconnect it the battery kicks back in and then eventually loses connection.  The DC input on the VMS looks solid and doesn't appear to be lose or show signs of damage.  I have had several shows where this doesn't occur and then it randomly does it again.  Very strange and annoying
Mics: DPA ST4011ER & 4018ER
Preamps: DPA MMA 6000 | Audioroot Femto
Recorders: Sound Devices Mixpre-10 II | Sony PCM A10

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__________________________
|Record|  Runtime: 4:19.99  {|||] 75%

 

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