The tables worked fine with the Technics PSU before and after the re-cap.
I suspect the PSU as well, but why would it be an issue with three different PSU? 😕😕
I suspect the PSU as well, but why would it be an issue with three different PSU? 😕😕
This is very odd. You are clearly a skilled man with very good test equipment. And I love the video of you in your signature.
I use these Kenwood PSU's that I bought new/surplus maybe 15 years ago ? click here And also in the SP-10 PSU that I sell I use LM317HVT for both the 5.0V and 32.5V BUT expect about 1.0A peak when starting up on the 32.5V line.
On your bench PSU have a look at the output voltage with a scope on start up and whist it's not performing properly, this should giver you the clue ?
Let me know before we go any further ?
I use these Kenwood PSU's that I bought new/surplus maybe 15 years ago ? click here And also in the SP-10 PSU that I sell I use LM317HVT for both the 5.0V and 32.5V BUT expect about 1.0A peak when starting up on the 32.5V line.
On your bench PSU have a look at the output voltage with a scope on start up and whist it's not performing properly, this should giver you the clue ?
Let me know before we go any further ?
Dave Cawley - no news yet, I haven't found the time to get in front of the bench. I hope to Monday ot Tuesday.
If I may ask, what did you do in your SP-10 PSU to regulate the 140V neon strobe supply?
If I may ask, what did you do in your SP-10 PSU to regulate the 140V neon strobe supply?
Never heard of it...
*Applies a bit of Google*
*Reads Datasheet*
Fantastic!! I had no idea there was such a device. I'll use it. 🙂
Here's the datasheet for those interested - http://www.supertex.com/pdf/datasheets/LR8.pdf
*Applies a bit of Google*
*Reads Datasheet*
Fantastic!! I had no idea there was such a device. I'll use it. 🙂
Here's the datasheet for those interested - http://www.supertex.com/pdf/datasheets/LR8.pdf
I, too, have an SP10-MkIIa, purchased off eBay years ago, and have had it in the closet since. Supposedly it doesn't run at the right speed -- yet to be diagnosed. Looking at the power supply schematic this week (inspired by this thread) I noticed that there is connection from the 5V regulator's output to the 32V regulator (TR410, R419, etc.). The VinylEngine schematic is too fuzzy to read, but I believe this may be a hold-off circuit that prevents the 32V from powering up until the 5V supply is up. I haven't gone beyond this, but it may be that incorrect sequencing prevents the rest of the electronics from working correctly.
Well spotted ! That is what it would do. And only on the "A" version which I have never actually seen.................
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Actually, a note on the schematic indicates that the non-A and -A versions have the same power supply.
If by 'that' you mean the hold-off circuit, it is there on both. Download the manuals from VinylEngine and take a look.
Again, if by "it", you mean the hold-off circuit, it is part of the schematic of the SP10 Mk ii at VinylEngine. That manual does not have a date on it.
Ops ! You are right, sorry !!
I have checked all versions too, this is the BBC one, but they all have the same start sequence. My mistake.
I have checked all versions too, this is the BBC one, but they all have the same start sequence. My mistake.
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