Denon DP-30L, platter removal

deeply dp
captmark
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Re: Denon DP-30L, platter removal

Post by captmark » 28 Aug 2016 22:36

You need to check your VR settings for the phono motor section with a scope-something is off, but if you have not recapped do that first-changing the VR settings before the recap is counter productive

crubio

Re: Denon DP-30L, platter removal

Post by crubio » 28 Aug 2016 23:15

I would confess that I don't know how to do that. It's easier for me to recap.

C

almabes
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Location: Acworth, Georgia

Re: Denon DP-30L, platter removal

Post by almabes » 28 Aug 2016 23:46

Just a word of caution. The motor drive section of the DP-30L runs at FULL 120V. It uses a Sanken S2C2023 transistor to switch the hot leg around. These can go flakey after 35 years. The platter motor drive section is optically isolated from the logic section because of the voltage involved on the drive side of things.

Be extremely careful poking around. You can light yourself up or fry something with a slip of the probe.

Without an oscilloscope, it's impossible to check the waveforms at the various test points.

braindogheadfish
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Joined: 15 Sep 2015 01:23

Re: Denon DP-30L, platter removal

Post by braindogheadfish » 03 Jun 2017 01:34

C

Did you ever identify the source of the noise and did you have any luck fixing it? I have the MK2 and the same noise. Performed service per manual but still have an oscillating hum under the exact same circumstances. I don't have a scope or the skill to go further...

Thanks

b