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Technics SP-10 Doesn't Spin
Technics SP-10 Doesn't Spin
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Old 20th October 2014, 12:28 PM   #1
breadhead is offline breadhead  United States
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Location: Pennsylvania
Default Technics SP-10 Doesn't Spin

Hello everyone,

I recently purchased a SP-10 MKII in "as is" condition so no complaints about the seller. It powers on and the strobe lights but that is it, no platter movement at all. I have minimal electronic experience. I have looked at the troubleshooting section here, Library Downloads - Vinyl Engine

I have taken some voltage readings but my low level skills don't allow me to interpret them, many of which are way off. Below are the readings I got:

E15 26.01V 28.18V

TR118 E 6.06V .408V
C 21.17V 28.13V
B 6.69V .121V

TR115 B .771V
C .162V

TR116 B .103V
C 6.07V

TR117 B .113V
C 6.07V .46V

D101 26V 0V

D106 6.7V 6.01V

D107 6.01V 0V

P3 20.52V

Any help would be greatly appreciated!

Thank you,
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Old 20th October 2014, 01:01 PM   #2
east electronics is offline east electronics  Greece
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Jim ...

None of the readings you posted is of any use unless you have a working SP10 open in front of you Or you have repaired at least 50 of them and you know them inside out ...

I don't think that you will find any of the above conditions in the forum easily ...

This is not a repair for a NB ,,,seek for expert help ...

The usual suspects though for direct drive Technics are
Dirty switches and bad contacts
poor soldering
Dried capacitors
But it gets even worst
IC that drive the motor
IC that produce or sensors that control the frequency

And so on and on
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Old 20th October 2014, 04:44 PM   #3
Drummerboy2 is offline Drummerboy2  United States
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make sure the motor is NOT locked down with the the transport screws in the locked down position. Also check the power supply output when cable is connected and make sure they are correct. You should be able to find that info on the vinyl engine site.

Hope this helps
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Old 21st October 2014, 08:24 PM   #4
Notinthislifetime is offline Notinthislifetime  United Kingdom
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You need to check the supply voltages to the drive circuit. What you are looking at is the control board and from recent experience those look correct. The service manual is available from the vinyl engine and contains the voltages you should be looking for at rest, bracketed numbers and at 33.3rpm, boxed numbers.

Good luck
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Old 22nd October 2014, 12:29 AM   #5
6L6 is online now 6L6  United States
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Technics SP-10 Doesn't Spin
You need a digital oscilloscope or an analog scope and frequency counter to get one of them set right...

But anyway, look for leaky caps, burnt resistors, and the like, in the PSU first, then the table innards.

Take a bunch of close-up, well-lit, in-focus photos and post them here.
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Old 22nd October 2014, 10:49 AM   #6
breadhead is offline breadhead  United States
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Join Date: Dec 2004
Location: Pennsylvania
Hello again and thank you all for your advice so far. I began to test voltages in the drive circuit but stopped after the first test as the readings were way off. I got 32.24V at a1. I tested TR38 and got these: 12.20V, 70mV, 11.47V and 12.46V, 3.5mV, 11.73V. I do have the service manual but as I stated, I am not well versed in electronics but am very capable in learning. Any help, again, much appreciated.

Thank you,
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Old 26th October 2014, 11:09 PM   #7
sgrossklass is offline sgrossklass  Germany
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There is a troubleshooting flowchart on page 6/7 which you'll want to follow (item (A)). So far you have only checked a single supply voltage (+32.5 V), which is a bit low but not worryingly so (plus I don't know how accurate your meter is).

Looks like the base connection of TR38 comes from TR127, so this one will need to be checked, followed by TR152, TR106 and TR107. Heh, the flowchart says check voltage and waveform on TR127 and TR151-154, not bad. So I guess you'll want to do that.
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