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The Incredible Technics SP-10 Thread
The Incredible Technics SP-10 Thread
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Old 12th October 2019, 11:40 PM   #1261
warrjon is offline warrjon  Australia
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Join Date: Feb 2011
Location: Terang Vic
Back together and looks good. Cleaned the bearing and replaced the thrust cap and ball with Silicon Nitride. But still not working correctly.

Replaced the bad TR129 and we now have the sawtooth wave at S. There is still an issue I have not found yet. I cannot adjust the period.

Pulse at T is unstable. Wave at TR105 B&E is correct (except for the dc offset) but there is no wave at base of TR121. I don't think the problem is in the Sample Hold I think either the Period or Differential is pulling it down. I'll have more time next weekend to get into it.
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Old Today, 07:01 AM   #1262
Dave Cawley is offline Dave Cawley  United Kingdom
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Join Date: Feb 2006
Location: Beautiful Dartmouth in Devon UK
Hi Warren

Thanks for the PM. That PCB is extraordinarily difficult to fix. I have had some where I had my sub-contractors changed every semiconductor and capacitor, it still did not work, so one was cannibalised from a rough unit.

Not the news you wanted, sorry.

"if it measures well & sounds good, it is good" : "if it measures badly & sounds bad it is bad" : "if it measures badly & sounds good, it could be improved" : "if it measures well but sounds bad it is bad"
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