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The Incredible Technics SP-10 Thread
The Incredible Technics SP-10 Thread
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Old 27th November 2018, 12:03 PM   #1171
SAP7 is offline SAP7
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So every diagram says 16v 100
My caps read 50v 100 fitted.

I have enough of either to fit so which would be best? Fit like for like and go 50 (ignore the manual).?

The replacement for 414 are actually 560uf and 50. My board just has 50v and 100uf for the four caps 411 to 414.

Or I have 16v 680.

Last edited by SAP7; 27th November 2018 at 12:08 PM.
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Old 27th November 2018, 03:59 PM   #1172
SAP7 is offline SAP7
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Also, two of the capacitors are axial, yet the parts on the list arrive as radial.
Do I just mount them with split leads and as normal, or should I be getting axial ones?
They are going to be a different part number?!
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Old 28th November 2018, 01:29 AM   #1173
JP is offline JP  United States
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Someone has already recapped that unit.
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Old 28th November 2018, 09:42 AM   #1174
SAP7 is offline SAP7
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Not sure what you mean.
My unit has the originals and two of them are axial on the board. Radials don’t fit as well.
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Old 28th November 2018, 09:46 AM   #1175
ralphfcooke is offline ralphfcooke  United Kingdom
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If you've already got the caps you intend using as replacements then rearranging the wires to make them fit is not going to be a problem. I would consider using a little hot-melt glue to fix down any caps with long leads.
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Old 28th November 2018, 11:09 AM   #1176
SAP7 is offline SAP7
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It’s more the lack of space. Axial caps fit the gap. The radial caps I have have little room to bend flatter.
One actually shorted by touching the pcb base above.
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Old 28th November 2018, 11:11 AM   #1177
ralphfcooke is offline ralphfcooke  United Kingdom
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In that case you've answered your own question , get the correct parts to fit in the space available.
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Old 11th February 2019, 03:57 PM   #1178
Thunders1988 is offline Thunders1988  Belgium
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Alright, after being gone for quite a while, I managed to get myself back on the SP10...
Found the problem to be a bad PSU, so I built one based on MPBarneyís blog and 2 cheap PCBís from eBay.
Voltages are correct and stable with the TT connected, so now Iím trying to set the PLL with a Rigol scope I picked up some time ago...

But I ran into a second problem.
I do get the correct waveforms on all three speeds and both channels, although the channel 2 waveform seems to fluctuate overtime (voltage increases/decreases) on all 3 speeds.
Turning trimmer 101 and 102 just adjusts the speed in which they fluctuate. The turntable refuses to lock, so speed isnít consistent.

Am I still making sense? Anyone suggestions on what to look out for?
Anyway... Will post pictures later, when I get my laptop out of my luggage.
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Old 11th February 2019, 07:12 PM   #1179
Thunders1988 is offline Thunders1988  Belgium
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In the attached images, you can see the wave of channel 2 decreasing. It's more obvious in the 78 rpm setting, but happening at the 33rpm as well...
Picture of the 5V PSU board included as well, I use a 10 turn trimmer. I find it helps with precision.
Attached Images
File Type: jpg IMG_5862.jpg (713.2 KB, 156 views)
File Type: jpg IMG_5863.jpg (488.1 KB, 131 views)
File Type: jpg IMG_5864.jpg (722.2 KB, 113 views)
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Old 18th February 2019, 05:12 PM   #1180
Thunders1988 is offline Thunders1988  Belgium
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At this point the TTís start/stop switch started acting up. Switch functions when tested with a DMM. I can select the 3 speeds, and start the SP10, but it wonít stop turning when pushed to stop.
So I started measuring some things following the fault-finding flowchart... Unfortunately it doesnít really give me answers.

As the speeds are off, I followed point (D): TT rotates abnormally.
Voltage at point e15 = 27,4vdc. 0,4vdc high so I measured TR115~118 and D101, 106 and 107

D101: Anode 27,71
Kathode 27,09

D106: A 6,62
K 5,919

D107: A 0,004
K 5,918

Tr115: E 0,04
C
B 0,778

Tr116: E 0,004
C
B 0,07

Tr117: E 0,004
C
B 0,08

Tr118: E 8,02
C
B 6,62

All of the transistors are way off... didnít measure the collectors, bit fiddly to reach without a steady hand.

Anyone got any tips as to where to start looking? Would be greatly appreciated.
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