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Denon DP-6000 restoration help

James Cox

James Cox

AK Subscriber
Subscriber
So my denon DP-6000 started having issues switching to 45rpm while I had it set to 33. I decided to open it up and clean and lube all the controls and make a list of capacitors to possibly recap it in the future. My problem is when I removed the platter and flipped it over this 2 reflective strips fell out from where the platter was. Any idea where they should be placed or what they do?
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Alright so it looks like those 2 strips must have something to do with the magnetic speed control. Since I couldnt figure out exactly where they went I stuck them to the side to avoid damage and preceded to clean to controls and test it. When I powered it on it spun ridiculously fast, probably close to 100 rpm or more. Any ideas where this strips should go?
 
Hi ! I very much doubt that these strips should be in the turntable . Denon disks have a special magnetic layer ( there is a brown coating on the inside of the disk ) . And usually in Denon turntables, a magnetic head was used as a speed sensor . The magnetic head was under the disk . It should read the marks ( poles ) of the magnetic layer-when the disk rotates . Remove these reflective strips altogether . And check the speed again . If the speed 33 works fine, then the circuit is working properly . Perhaps the problem is in the speed switch 33/45, or in the circuits responsible for the speed 45 ....P.S - Be careful with this magnetic layer .
 
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I can't find anything about those strips in the service manual, so they are probably not original to the turntable. Just remove them completely.

You need to realign the magnetic head, this is from the service manual for DP-60L but all Denons are the same in this respect:

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Also don't forget to adjust the PLL:

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There is a useful picture in the DP-2000 service manual that shows what the control pulses should look like on the scope (DP-2000 and DP-6000 share the same phase lock amp circuitry):

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See I was thinking the same thing. I searched all over to find a picture with the paper strips with no luck. Glad no one else knows what they are haha. When I opened the metal cover to get a cap list some of the wires that were glued in place kept coming loose. I bet something has disconnected to cause my weird speed problem. I'll open it back up today and see what happens
 
Alright it took me a bit longer to get back to this one but after reseating all the connections for the circuit boards and adjusting the the tape head thing it's back to spinning at normal speeds. Theres still a little fluctuation so I'm going to recap it while I have it out of my system. Thanks for the help!
 
James Cox said:
Alright it took me a bit longer to get back to this one but after reseating all the connections for the circuit boards and adjusting the the tape head thing it's back to spinning at normal speeds. Theres still a little fluctuation so I'm going to recap it while I have it out of my system. Thanks for the help!
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There's a good chance that the fluctuation you mention is the result of the strobe marks on the platter being a bit imperfect.
 
It only happens in auto mode, if I set it to manual I can get the strobe completely steady by adjusting the pitch wheel. On auto mode the strobe kind of flutters every second or 2. Since its steady in manual it makes me think a recap may fix the problem. There was only about $20 worth of caps under there so i think it's worth a try.
 
I ordered the caps today along with some for a few other projects I'm working on. I'll update when the caps come in. On a side not, is there any interest in a restoration thread for an small admiral tube console? It's a pretty cool desktop piece that a friend of mine has asked me to get working so he can set it up in his wifes antique shop.
 
Alright, heres hopefully the final update on the denon. My parts came im so I went ahead with the recap today. The recap itself was only about 2 or 3 hours but when I powered it on it light up for a second then died!
I started my troubleshooting by checking polarity of all my caps and discovered the 1000uf 63v cap was reveresed! After flipping it I still wasnt getting any power so I removed all the boards and looked for any other mistakes or blown fuses. No luck so I dug around a bit further and discovered the first fuse after power cord had blown. I happened to have a close replacement so I soldered it in place and presto! The table was spinning. After making the proper adjustments Its now spinning at perfect speed with no flutter in the strobe! Looks like it's good to go now.
I'll be starting on the admiral console tomorrow most likely so I'll start a seperate thread in the tune gear section on that one. Thanks for everyones help!
 
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