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avatar: Lance
Lance
22 posts
Replied to Lance's post on December 6th, 2012

What exactly does E-29 mean when the Sorvall Legend RT centrifuge shows this in the display?  I've changed the circuit board attached to the bottom of the motor, which is a combination tach sensor/ imbalance detector.  I still saw E-29 after doing the repair, but, was able to run the centrifuge a dozen times after turning off then back on.  Motor bearings feels smooth.

At wits end

Replied to Lance's post on December 10th, 2012

MAybe try to grease the swingging buckets where they attach !

Send me your e-mail.

 

regards

avatar: Lance
Lance
22 posts
Replied to Jonathan Bélanger's post on December 21st, 2012

Funny thing about this machine, it runs fine in the shop.  I checked the ohms on the motor windings.  No shorts to ground.  The ohms would change when testing the tan colored wire against another motor wire.  So, I soldered the brass tips that the factory puts on the end of the motor wires.  Ohms test is steady now.  Machine runs as it did in the shop.  Could that be my problem?  Oxidation under the brass tip on the end of the wire looking like an open winding.

avatar: sani
sani
5 posts
Replied to Lance's post on October 13th, 2013

I have the same problem with my sorvall legend rt. have you settled the problem with removing of brass oxidation? thanks for your reply

avatar: Lance
Lance
22 posts
Replied to sani's post on October 14th, 2013

I ended up replacing the motherboard

 

Lance

avatar: sani
sani
5 posts
Replied to Lance's post on October 14th, 2013

Dear Lance

Thanks for your reply. you mean "oxidation under the brass tip on the end of the wire"  was not the main problem and something is wrecked in the mainboard. Is there any place to buy this mainboard.

 

 

avatar: Lance
Lance
22 posts
Replied to sani's post on October 14th, 2013

Sani,

It turned out that was not the main problem.  The main board was.  I ordered the motherboard from Thermo Fisher.  But the new motherboard might have some different connectors on it for some of the plug-in sensors.  I had to modify either the sensor connector or the new motherboard connectors (which is not really advisable) to make everything work.  It all depends on the age of your centrifuge as to whether the bad motherboard and the replacement board match or not.

I felt that the unstable ohms reading I was getting while checking the motor windings was not right either.  So,  I fixed that by soldering the brass sleeve to the wires, which, was only crimped on.  That way the winding won't intermittently "drop out" during a run.

avatar: LabWrenchSiteAdmin
LabWrenchSiteAdmin
991 posts
Replied to Lance's post on October 15th, 2013

Hi Lance

I have posted a user Manual in the Documents tab of the Sorval Legend RT.  The error codes are listed at the back of the manual.

You can access the manual through the following link.
http://photos.labwrench.com/equipmentManuals/17389-6239.pdf

Respectfully
Ronnie

avatar: sani
sani
5 posts
Replied to LabWrenchSiteAdmin's post on October 17th, 2013

Dear Ronnie

Did you have service manual of sorvall legend RT/T. I have found breakdown drawing of this centrifuge, but there was no service manual in the web.

Regards

Sani

avatar: LabWrenchSiteAdmin
LabWrenchSiteAdmin
991 posts
Replied to sani's post on October 17th, 2013

Hi Sani

The Instruction Manual posted on LabWrench is for the Sorvall Legend T / RT.  Unfortunately we do not post service manuals.

The Instruction Manual is posted under the DOCUMENT TAB of the Sorvall Legend RT product page.  You can access it at the following link.

http://photos.labwrench.com/equipmentManuals/17389-6239.pdf

Respectfully
Ronnie

 

Replied to LabWrenchSiteAdmin's post on October 17th, 2013

Sani, please give me your e-mail address.

Regards

avatar: sani
sani
5 posts
Replied to Jonathan Bélanger's post on October 20th, 2013

Dear Jonathan

my email is  sisi1380@yahoo.com

Regards

avatar: sani
sani
5 posts
Replied to Lance's post on October 23rd, 2013

Dear Lance

We changed power transistor BD234C and  capasitor to remove e-29 error. now everything is ok.

Regrards

Sani

avatar: Lance
Lance
22 posts
Replied to Lance's post on October 23rd, 2013

Sani,

Thanks for the tip! I'll remember that for next time.

Lance

avatar: Ning
Ning
1 posts
Replied to Lance's post on September 13th, 2018

Our Sorvall Legend RT also shows "E-29" and does not run now. I saw over 1,600 reads on this post, so I guess "E-29" is a common problem. Any suggestion to get it repaired? Thanks!!