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VPI SDS 45 RPM malfunction

I have a brand new SDS unit that I've used for about a month now and it's been working fine at 33 rpm, but last weekend I tried to put on a 45 rpm record and the unit malfunctioned. I was able to adjust the frequency up to 80.80 Hz, which the strobe indicated resulted in correct speed, but the voltage would flicker between 72 and 115 V for several seconds and settle at 72. It seemed the turntable was holding speed at 72, but when I put the record on and the periphery ring, the SDS kept going back and forth in frequency between 33 and 45 (up and down between approx. 60 to 80 Hz and the motor would audibly "slip" when the SDS got to 80.80 Hz and then started going back down).

Is this a matter of adjusting the unit or is the unit broken? I sent an email to VPI, but I know they are very busy so I thought in the meantime I'd ask here. Any ideas or suggestions?
actusreus
in_shore's avatar
in_shore
596 posts
 
A month old ,...SEND it BACK,...geeze
actusreus OP
733 posts
 
If I can re-set it myself, why would I send it back to VPI and wait for who knows how long to get it back, new unit or not? Btw, the calibration manual may as well have been written in Chinese. I can't possibly follow it, but at the same time it cannot be that complicated since adjusting voltage only involves user accessible front panel buttons, as far as I understand. Anyone here can provide a quick tutorial? It'd be greatly appreciated.
rodman99999
6,167 posts
 
Go here: (http://vpiindustries.com/manuals/CALIBRATION_MODE_FOR%20_SDS.pdf)
rodman99999
6,167 posts
 
Turn off the unit and disconnect it from the turntable.
With
your fingers on both arrow buttons, turn the unit on.
Remove
your fingers from the arrows within two seconds of turning
it
on and seeing, "CAL" displayed on the left. Press
the RPM selector button repeatedly, until, "C5" is
displayed on the left and the run voltage on the right. Use
the UP/DOWN arrows to select the voltage you desire(I'm
using 102V). Press the RPM button again, to return to,"CAL"
in the left display, and press an arrow button to exit the
CAL mode.
If your unit doesn't allow you to set your desired
voltage(probably higher than mine), send it
back to VPI.
actusreus OP
733 posts
 
Rodman,
Thank you. Is this calibration for 45 RPM only? 33 works fine at 72V and I'd like to keep it that way.
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