Iratic speed Denon DP-35f

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Jack3724
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Iratic speed Denon DP-35f

Post by Jack3724 » 08 Apr 2018 03:46

Got it at ebay. Turntable spinning like 78 RPM or better. Then it went to the proper speed 33 1/3 but lock light blinks occasionally and song wavers as it blinks. Is it the IC?

Legrace
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Re: Iratic speed Denon DP-35f

Post by Legrace » 08 Apr 2018 12:34

Aging electrolytic caps are more often implicated in speed stability issues. My Sony exhibited same problem, speed drops resulting in a warbling effect. Replacing caps (not all, just the electrolytics) and cleaning the speed pots corrected the problem. My Denon has also been recapped, but by the previous owner. Recapping and cleaning seems a de rigueur thing when acquiring older DD's.

Jack3724
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Re: Iratic speed Denon DP-35f

Post by Jack3724 » 09 Apr 2018 20:21

Thank you. That sound like a good start. Caps it is.

Jack3724
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Re: Iratic speed Denon DP-35f

Post by Jack3724 » 28 Apr 2018 02:03

Did complete electrolytic recap and now motor runs as soon as tt is turned on. Now I have 2 problems. Any info appreciated.

jcwineman
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Re: Iratic speed Denon DP-35f

Post by jcwineman » 28 Apr 2018 03:32

I have a denim dp40f that the speed would not lock in it fluctuated took it apart and used electronic parts spray and clean the speed potentiometers while turning them back and forth fix the problem

Jack3724
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Re: Iratic speed Denon DP-35f

Post by Jack3724 » 02 May 2018 04:46

Appreciate your suggestion. Is WD 40 OK?

EdAInWestOC
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Re: Iratic speed Denon DP-35f

Post by EdAInWestOC » 02 May 2018 20:31

WD40 is a penetrating oil and should not be sprayed into any potentiometers. The erratic speed issue does indeed sound like a recap issue but it sounds like a mistake was made when the recap was done.

You will have to review everything that was replaced to make sure nothing was installed improperly and there are no broken traces on the PCB. I cannot speak to the 35F but I own a DP-62L that had speed issues and it turned out to be a recap job.

After my recap job was done I had other problems including a power problem. The traces on that Denon PCB are subject to cracking and loosing continuity if the soldering is done too long and the solder joint was overheated.

I had one hell of a time with that table until I traced down all of the problems that I caused. I am an experienced technician but that PCB was the most sensitive PCB I ever worked with.

Ed

Jack3724
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Re: Iratic speed Denon DP-35f

Post by Jack3724 » 03 May 2018 04:34

Thank you Ed you made a lot of good points. My eyes won’t hold up any more trying to read some of those caps. Thanks again and wish you the best, Jack

Jack3724
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Re: Iratic speed Denon DP-35f

Post by Jack3724 » 12 Jun 2018 21:52

I am no longer in need of advise for my Denon 35 F as it is in some land fill on Long Island. I do thank all who have communicated to me with very helpful hints. I am now the owner of a Technics SL-BD35 which is a fully automatic TT. Thanks to all again and as
Arnold S stated "I'll be back".

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