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The Incredible Technics SP-10 Thread
The Incredible Technics SP-10 Thread
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Old 25th August 2018, 12:21 AM   #1101
ra7 is offline ra7  United States
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The Incredible Technics SP-10 Thread
Good point. I'll poke around to see if there are dead critters on the 5V circuit. Any pointers?
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Old 25th August 2018, 07:54 PM   #1102
Retrosoulman is offline Retrosoulman
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Quote:
Originally Posted by JP View Post
5V is sensitive but 50mV low won't matter. That you can't get higher than 50mV is tell-tale of a issue, as is the overheating - seems something is drawing too much current.
My PSU overheating ! ALSO got these issues : when i press the 75 rpm button (the turntable is stoped) the strob looks a little weak.
The other issue is that speed looks to waves a little back and forth (at all speeds) but maybe this is because the platter looks very very little bented (the motor to be honest)

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Old 27th August 2018, 02:21 AM   #1103
mahdi8 is offline mahdi8
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4 months ago I bought an SP10 mk2a in a decent condition all is working well and I haven't use it a lot in the last 4 months because I haven't got a plinth for it. I've recently made a plinth for it So I spend a bit of time to do clean up and oiling.

After oiling the bearing (2 drops of sp10 original oil) There is some scraping sound so I dismantle and motor and checked the bearing. looks like it's almost dry with some green coloured grease (I assume this is a mixture of the old oil and debris from the trust pad). The thrust pad looks a bit worn (though I forgot to take pictures). I clean up the bearing well and put 3 drop of oil directly on the well and resit the bearing cap test. It's now silent on 33 and 45 but it's scraping sound is back on 78. and after it's running on 78 the scraping sound comes back on 33,45 but it disappear again after I lift and resit the bearing.

So this is my conclusion. When I first got it was originally bone dry and was hold by greased up oiled debris and when I put in the new oil it just flushed the debris and showed up the issue with trust bearing.

I've ordered a replacement torlon thrust pad so I hope it will resolve the issue even with the 78 speed. Anyone has experience similar issue? or pointer on what I should check next while waiting for the thrust pads to arrive?
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Old 27th August 2018, 08:28 AM   #1104
Dave Cawley is offline Dave Cawley  United Kingdom
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ra 7

A bit of a long shot, could you look at the drive to each of the 3 motor coils. Sometimes one driver transistor is down and that can make it run but cause all sorts of issues.

Also what are you using to measure the 5.0V line ? Also with the PSU disconnected what is the voltage ?
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Old 27th August 2018, 08:31 AM   #1105
Dave Cawley is offline Dave Cawley  United Kingdom
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mahdi8

You could check by putting a small piece of plastic in the bearing ? However are there any scrape marks anywhere ? Have you tried using a cheap automotive (or other) stethoscope to localise the noise ?
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Old 27th August 2018, 09:22 AM   #1106
mahdi8 is offline mahdi8
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Thanks Dave I at the moment it's stable and no noise on 33 and 45 and I'm reluctant to try 78 before putting in the new thrust pad. Regarding scrape marks yes I can see scrape mark on the raised ring around the bearing well but strangely not on the spindle cup but doesn't look like there is any scraping on the motor coils. But enough for me not to try to reproduce the issue without new parts.

Regarding small piece of plastic (I assume to simulate thicker trust pad) I'm worried it would get stuck in there and make things worse unless you have suggestions on some same material to use
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Old 27th August 2018, 10:24 AM   #1107
Dave Cawley is offline Dave Cawley  United Kingdom
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Originally Posted by mahdi8 View Post
Regarding small piece of plastic (I assume to simulate thicker trust pad) I'm worried it would get stuck in there and make things worse unless you have suggestions on some same material to use
Yes, but if it worries you wait until the proper one comes ?

Dave
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Old 27th August 2018, 11:18 PM   #1108
mahdi8 is offline mahdi8
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Originally Posted by Dave Cawley View Post
Yes, but if it worries you wait until the proper one comes ?

Dave
I bought the new thrust pad 2 days ago so hoping it arrives next week meanwhile I'm monitoring the table every day. until now it's still no noise so hopefully it's safe to keep using it. In an event this doesn't solve it Any other known common bearing issue with sp10? Bearing well has been cleaned and lubricated with original sp10 oil
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Old 28th August 2018, 04:13 PM   #1109
ra7 is offline ra7  United States
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The Incredible Technics SP-10 Thread
Hi Dave, I checked the waveforms on A1, A2, and A3, and basically they were garbage. It looks like a sine wave, but it is very distorted.

I also checked the 5V with a Fluke DMM, and it was dead on 5V. Earlier I was using a cheapo no-name DMM, but in the past it has read quite close to the Fluke.

Unfortunately, as I was measuring the 5V under the table I shorted between C2 and C4 or something, saw a spark, and now the table won't rotate. One of the fuses was hot and looks almost burnt. Will replace and see if it works. Really bummed I did that.
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Old 28th August 2018, 10:52 PM   #1110
Dave Cawley is offline Dave Cawley  United Kingdom
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Quote:
Originally Posted by ra7 View Post
Hi Dave, I checked the waveforms on A1, A2, and A3, and basically they were garbage. It looks like a sine wave, but it is very distorted.
.
Were all 3 the same ? Is the PSU now OK ? and under load ?

Dave
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