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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
rodman99999
6,206 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.
actusreus OP
733 posts
 
The unit appears to be broken, strangely for the 45 RPM function only. I tried to recalibrate it, and it was factory-set to 102V for 45, which should work fine. I increased the voltage to 115V to see if that would do the trick, and the result was the same. Thanks all for your feedback and suggestions.
rodman99999
6,206 posts
 
For future reference; C4 is the function, for setting 33.3 RPM run voltage. Too bad setting voltage wasn't the issue. Hopefully, VPI's Repair Dept will be on the ball, and get you back into operation quickly!
brf
1,715 posts
 
Contact your dealer in which you purchased he SDS, perhaps they can simply exchange the unit or loan you a SDS while yours is getting repaired. Your Dealer should make the situation rate.
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