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Need help with power supply: Diatone DP-EC! turntable.
Need help with power supply: Diatone DP-EC! turntable.
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Old 25th January 2020, 12:14 AM   #11
sgrossklass is offline sgrossklass  Germany
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Location: Germany
Do you get any DC voltage on C313/R305?

I suspect you might have a short on the +12V somewhere that's pulling everything down.

If it's not too much hassle, try disconnecting the RED wire at #23 and measuring again. You can also try measuring resistance to ground at this spot before/after (with power off).

BTW, the solder joints on the transformer primary look a bit crusty to me, the 0 V in particular. That clearly wouldn't be helping matters. Any change of output voltage if you wiggle the cable? A bit of flux and fresh solder may be appreciated.

Is the power switch delivering a decent enough contact resistance?

A flaky primary connection or power switch are about the only reasons I can think of for why unloaded voltages were higher than loaded. Well, either those or a flaky thermal fuse... At times these have been known to go bad all by themselves, but here the potential short on +12V might just have sort of degraded it. Maybe try getting a resistance reading on the primary and observing whether tapping the xfmr changes anything.

Worst case would be some shorted turns. That would make the transformer get quite warm though.
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Old 25th January 2020, 12:27 AM   #12
cal16v is offline cal16v  Australia
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Quote:
Originally Posted by PBR
All three places the schematic says "120V" have a halo like someone pasted-in a change. Like 240V is the base design, a 120V model was sold in the US, and the scan was taken from a US manual.

Your transformer shows a "240V" winding so you are probably OK.
Yesterday 08:32 PM
Thank you. Nice to know the unit is unmolested.
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Old 25th January 2020, 12:29 AM   #13
cal16v is offline cal16v  Australia
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Quote:
Originally Posted by rayma View Post
Seems to be a problem there. What's the DCV at #14, #20, and #24 wrt #18 ground?
Here we go!

#14 - 25.7VDC
#20 - -21.6mVDC
#24 - 5.82VDC

cheers
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Old 25th January 2020, 12:36 AM   #14
cal16v is offline cal16v  Australia
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Ok just following the path from #14, 20 & 24 and they lead to this!
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Old 25th January 2020, 12:57 AM   #15
rayma is offline rayma  United States
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Quote:
Originally Posted by cal16v View Post
Ok just following the path from #14, 20 & 24 and they lead to this!
Are you kidding me? Those tabs can't touch anything, they're all at different potentials.

Last edited by rayma; 25th January 2020 at 01:03 AM.
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Old 25th January 2020, 01:05 AM   #16
cal16v is offline cal16v  Australia
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No joke rayma. I just followed the power to these 3 transistores and found what I found.
if it's any consolation they were sheathed in old plastic tubing.
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Old 25th January 2020, 01:06 AM   #17
cal16v is offline cal16v  Australia
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Can I still buy these or is there any replacements?
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Old 25th January 2020, 01:09 AM   #18
rayma is offline rayma  United States
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Quote:
Originally Posted by cal16v View Post
No joke rayma. I just followed the power to these 3 transistores and found what I found.
if it's any consolation they were sheathed in old plastic tubing.
Does that look original, or did someone do that after the fact? Terribly shoddy practice.
Check them unpowered with a dvm on the diode function. At least one is good.

Last edited by rayma; 25th January 2020 at 01:15 AM.
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Old 25th January 2020, 01:11 AM   #19
rayma is offline rayma  United States
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Quote:
Originally Posted by cal16v View Post
Can I still buy these or is there any replacements?
https://datasheet.octopart.com/2SD33...t-15979812.pdf
Bipolar Transistor Cross-reference Search | Equivalent Transistors

Last edited by rayma; 25th January 2020 at 01:20 AM.
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Old 25th January 2020, 01:17 AM   #20
cal16v is offline cal16v  Australia
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Quote:
Originally Posted by rayma View Post
Does that look original, or did someone do that after the fact?
Terribly shoddy practice.
DIATONE DP-EC1

The pi8c there shows a mounting panel for these in the bottom right corner. I suppose I could fashion something to secure them.

Generally, I get the impression someone else has been in and around the power side of things.
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