Wurlitzer 4000

[Northern.Glenn]

I recently become the proud owner of a Wurlitzer Organ Model 4000 . As I had worked as a Xerox Service Agent in Canada, I am comfortable working on electronic devices. I am looking for a Service Manual pdf file for this unit, if someone may have a copy?
I would greatly appreciate it. Everything works but "Middle-C" & the last key on the top top set of keys. I am new at piano/organ playing. My wife & I are looking forward to learn to play it. But, very challenging without the'MIDDLE-C' key working. I was told by previous owner, the contacts on the pcb needs cleaning. I rather wait until I get a service manual & follow procedure. We live on MILE 300 on the famous Alaska Highway! The Next community is some 4 hours drive away!
Any help would be greatly appreciated.

GLENN

[andyg]

They used the 4000 number twice! However the one from 1958 was a single manual instrument.

That means that this is one of the re-badged Hohner instruments distributed by Wurlitzer in their final years. Your 4000 is actually a Hohner D-94. So it's that service manual you need if you can't find one that says Wurlitzer.

Your issue with the keys is most likely just key contacts. Open up and see if you can access them. You usually find that once the top panel is removed or hinged up, the fascia and manuals will also hinge up once you've removed some screws or bolts. Two types of contact used at this time. One is simple metal to metal whiskers and these can bend or sometimes simply tarnish. The other type comprises strips of rubber and carbon contacts. Dirt can esaily get trapped in these. Once you have access, you can clean the carbon part of the contact with denatured alcohol.

I've moved your post into a better section of the forum - Andy G, Moderator

[Northern.Glenn]

Thank you much in helping us newbies.
Mae appreciate you placing our request in the right place. Plus, letting us know the true model we own. 😊

Glenn

[andyg]

You're welcome.

For some reason, the second half of my post didn't survive the move into the new section.

Your issue sounds like it's key contacts on those two notes. There are two types of contact in common use. Older organs used metal to metal 'whisker' contacts that could bend or tarnish. Easy to bend back or clean. The other type uses strips of rubber and carbon contacts. Dust can get into these quite easily and cause dead notes. Once you have access to the contact strips, you can clean the carbon part with a cotton bud (Q-tip) dipped in denatured alcohol.

Getting access involves removing or hinging up the top lid, followed by hinging up the fascia and the upper manual. These will all be secured by bolts or screws, some of which will probably be underneath the keybed of the organ, so you go in from underneath!

[tucsondave]

The Omni manuals do not have any disassembly instructions, at least the 6000 doesn't.
To add to what andy said, heed all cautions concerning static discharge and do not touch any of the internal trimpots.

td

[Northern.Glenn]

Thank you all :)

As I getting more familiar with this instrument, All though, the back label states this is a Wurlitzer 4000, The Name plates states Hohner Computer System & the Name plates stating Wurliter Omni 1000 Keyboard System.

I hope the pictures of the organ will help?







Does these pictures still suggest an Hohner D-94 Organ?
Does anyone know what year it was made?

As a service Technician for Xerox for 22 years, I also agree regarding electrostatic discharge are detrimental to PCB assemblies. :)
Thank you for the warning!

I have only have visually inspected the key spring that holds each key into its proper position. I am guessing that each contact for each key is just in advance of the spring that the contact point is made onto the PCB (printed Circuit Board,) or, some other contact point, other than making contact on a location point on the PCM itself?

I am seeking for the proper procedure for getting access to these contact points for cleaning with 100% isopropyl contact cleaner?
It maybe, that each key, may need to be removed from its securing spring, in order to access the contacts underneath?
Technical help is needed. Though, I am familiar around complicated electronic systems, I am not with these kinds of instruments. I do not want to attempt this proceed, unless I have the schematics with the proper procedure from a manual. Even if, it is only the files I needed to clean the contacts successfully.

Thank you so much for your help & technical expertise.

Glenn Collins

PS: I am living at Mile 300 on the Alaska Highway in Fort Nelson, is very limited in obtaining such expertise. :)

[Northern.Glenn]

Here is the s/n on the back panel of the instrument...



Glenn

[Northern.Glenn]

Having troubles getting in touch with Wurlitzer. Would someone kindly pass their contact info on to me, please? Their Homepage or similar? I could not find it under its name.com.

Glenn

[you795a]

Morelock's Organ Parts & Service in Rienzi, MS in the USA has all the Wurlitzer parts.

[tucsondave]

Look under the keyboard shelf for keyboard hold down screws. Usually two per keyboard near the ends. then hinge up keyboards.
td

[Northern.Glenn]

Thank you tucsondave.

As I saw the keyboard shelf hinged with a screw on each side, I new this had to lift up like a car hood.
O found them. I cleaned the black contacts in rubber buttons under each key with isopropyl alcohol, and the PCB under them, it worked great!
Now, my middle -C works again!

I will be learning to have some happy playing :-)

Thanks

Glenn

[Northern.Glenn]

Now I understand andyg's instructions about the screws underneath & hinges up.
OH, BOY! :-)
I do have lots to learn.
Thank you all for your patience.

Now to learn playing her.... :-B

Glenn