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my05
Joined: Jan 02, 2010 Posts: 26 Location: stockholm, sweden
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Posted: Tue Sep 13, 2011 2:52 am Post subject:
Blofeld with low output and no phones Subject description: low volume / no volume |
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Hi,
I recently acquired a Blofeld with the above problems. I have tried to contact Waldorf (no answer yet) regarding this as i have also searched the net and found other people with similar problems.
Some people claim that the problems started when they upgraded the firmware to 1.15, some other people have had this problem since earlier FW versions.
When trying to find more details, some search-hits points to either a broken transistor or the op-amps that drives the line and phone jacks. What usually "breaks" on the Blofeld?
regards
Daniel |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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Posted: Tue Sep 13, 2011 5:15 am Post subject:
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You might just have a bad output socket. _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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my05
Joined: Jan 02, 2010 Posts: 26 Location: stockholm, sweden
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Posted: Tue Sep 13, 2011 6:34 am Post subject:
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v-un-v wrote: | You might just have a bad output socket. |
Hi,
I assume that would be possible, but there is sound coming from the line outs (low, but still). When i crank the mixer up, the sound is chrystal clean without glitches or any other bad things). I've heard that the Blofeld output volume is low, but not this low.
I will take the Blofeld apart and start to measure in/out signals on the two op-amps.
(apparently a LM1877 for the head-phones and a NE5532 for the line outs) |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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Posted: Tue Sep 13, 2011 7:00 am Post subject:
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HOw much noise is present on the output?
It may be that the Blofeld has a really wide dynamic range. I had the same problem with this with my old Yamaha AN1x.
It's something I need to check with my own Blofeld. I still havent had the time to play with it. _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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my05
Joined: Jan 02, 2010 Posts: 26 Location: stockholm, sweden
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Posted: Tue Sep 13, 2011 9:22 am Post subject:
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v-un-v wrote: | HOw much noise is present on the output?
It may be that the Blofeld has a really wide dynamic range. I had the same problem with this with my old Yamaha AN1x.
It's something I need to check with my own Blofeld. I still havent had the time to play with it. |
No noise at all tbh. I guess it was not supposed to leave THAT much headroom either ( ) since i really need to adjust both the volume and gain to the max to get a normal (clean) signal from it.
If you would have the time to check your Blofeld, i would really appreciate to hear your opinion regarding the the output.
regards
Daniel |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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Posted: Tue Sep 13, 2011 10:54 am Post subject:
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Now there's a really good excuse to plug mine in!
I'll try tomorrow. _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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my05
Joined: Jan 02, 2010 Posts: 26 Location: stockholm, sweden
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Posted: Tue Sep 13, 2011 11:05 am Post subject:
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Appreciate it |
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my05
Joined: Jan 02, 2010 Posts: 26 Location: stockholm, sweden
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Posted: Wed Sep 14, 2011 2:14 am Post subject:
Update - What probably causes this |
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After getting in touch with another Blofeld owner/electro engineer and getting some indirect information from Waldorf, i now can assume that the resistor sitting between the psu and the op-amps is to blame.
Apparently, this resistor (6.8 ohm, 1/4 watt SMD) is also used as a fuse to protect the hardware and when it blows, the result is just like this (i.e low/no sound). |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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Posted: Wed Sep 14, 2011 6:39 am Post subject:
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That's good to know.
Thanks Daniel! _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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dougt
Joined: Jun 16, 2007 Posts: 42 Location: Silicon Valley, CA, USA
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Posted: Tue Oct 02, 2012 5:20 pm Post subject:
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Same thing happened to me. Can you tell me the board location of that resistor? Is it the one by itself between the Shift button and Mix 1 pot?
Thanks _________________ http://www.synthparts.com |
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dougt
Joined: Jun 16, 2007 Posts: 42 Location: Silicon Valley, CA, USA
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Posted: Mon Oct 15, 2012 3:14 am Post subject:
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OK so I replaced that resistor and it's working fine again. For future reference for anyone else who might encounter this problem it is the resistor located between the Shift button and the Mix 1 pot. _________________ http://www.synthparts.com |
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wishniak
Joined: Jan 05, 2009 Posts: 27 Location: berlin, germany
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Posted: Thu Feb 21, 2013 6:02 am Post subject:
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hmm - glad to find this post - just picked up a blofeld and it seems to have this problem too. anyone else made this repair? know of the top of their head the value of the resistor (before i crack this thing open?). thanks.. |
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wishniak
Joined: Jan 05, 2009 Posts: 27 Location: berlin, germany
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Posted: Mon Feb 25, 2013 6:29 pm Post subject:
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ooops - finally re-read and realized my thread reading comprehension sucks sometimes.
but ouch SMD... anyone tried this to any success? |
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dougt
Joined: Jun 16, 2007 Posts: 42 Location: Silicon Valley, CA, USA
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Posted: Tue Feb 26, 2013 4:30 am Post subject:
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Yes I used a regular sized resistor... _________________ http://www.synthparts.com |
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Tue Feb 26, 2013 6:09 am Post subject:
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thanks all ... mine was a bit quiet when i got it (free!) and seems to have got worse.
ill have a look
cheers
Ben |
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urbanspaceman
Joined: Feb 26, 2008 Posts: 77 Location: italy
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Wed Feb 27, 2013 2:54 am Post subject:
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Thank you very much Urban
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Sat Jul 06, 2013 8:28 am Post subject:
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So i finally got round to doing this, i used regular sized 10r as it was the nearest i could find and it works great again, thanks all!
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gus green
Joined: Jul 12, 2013 Posts: 1 Location: la
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Sat Jul 13, 2013 12:07 pm Post subject:
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no thats far too big, and not fusible.
you need a 6.8 ohm, that 6;8k ohm - 6800 ohms!
theres not really any on ebay i can easily find.
I had to buy 5 anyway, so if you pm me your address ill send you one.
cheers
ben |
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alanzo
Joined: Jan 14, 2009 Posts: 13 Location: Burlington, VT
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Posted: Tue Sep 30, 2014 6:46 pm Post subject:
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I think mine is having the same problem after spilling some liquid on it. Anyone have a suggestion as to whether I should attempt the fix myself, or find a shop to do it for me? I've never soldered anything before, but have at least opened up synths for battery replacement and cleaning. _________________ http://www.youtube.com/alanmarcero
Sounds for your Virus TI, Alesis A6 Andromeda, Prophet '08, Nord Lead 3, and JP8000 / JP8080:
http://www.alanmarcero.com |
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chaosbc
Joined: Jan 03, 2015 Posts: 3 Location: France
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Posted: Sat Jan 03, 2015 12:28 pm Post subject:
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Hello there.
I purchased a 2nd hand blofeld yesterday.
It seems I have the same low output issue as everybody.
Can't find any fuse resistor from 4.7 to 6.8 ohms (it seems that's what Waldorf advocate according to =>http://www.waldorf-forum.com/pipermail/user-forum/2012-October/027758.html)
If someone know a site selling such a resistor fuse even a through hole one will fit...I tried mouser, aliexpress and many others with no luck |
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chaosbc
Joined: Jan 03, 2015 Posts: 3 Location: France
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Posted: Sat Jan 03, 2015 1:07 pm Post subject:
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I eventually found 5 on ebay (USA) but they are 10 ohm 1/4 watt
If if worked for Paradigm X, it may work for me.
Still...Warldorf could have made it with a resettable fuse or a regular fuse and a daisy chained classical resistor...but consumer society won again I guess |
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Sun Jan 04, 2015 2:04 pm Post subject:
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if you are worried, you could put two in parallel to make about 5 ohms
Mines still working fine fwiw
Good lcuk |
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chaosbc
Joined: Jan 03, 2015 Posts: 3 Location: France
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Posted: Thu Jan 08, 2015 6:54 am Post subject:
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So obvious I did not think about it...
Thanks ! |
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