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Old 20th June 2012, 10:41 AM   #1471
AndrewT is offline AndrewT  Scotland
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What do you have in your Vref string?
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Old 20th June 2012, 11:16 AM   #1472
merlin el mago is offline merlin el mago
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One 1N4007 (in place LED), jumper for place other LED, two jumpers (one in R103 and one in D103) & the 22R in series with 33R both paralleled with 15R
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Old 20th June 2012, 11:18 AM   #1473
AndrewT is offline AndrewT  Scotland
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Please draw out the modified Vref string so that I and others can see what you have done and what you have measured.
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Old 20th June 2012, 11:47 AM   #1474
merlin el mago is offline merlin el mago
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Attached modified schematic.

I measured again today:

-Voltage across R305 (11R78) 3.06V
-Voltage across 1N4007 0.76V
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Old 20th June 2012, 12:56 PM   #1475
AndrewT is offline AndrewT  Scotland
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******* Hell, the diode is in back to front !
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Old 20th June 2012, 01:02 PM   #1476
merlin el mago is offline merlin el mago
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Salas told me to put it oriented as the LEDs, isn't OK in the pic?
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Old 20th June 2012, 01:16 PM   #1477
Salas is online now Salas  Greece
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SSLV1.1 builds & fairy tales
Merlin, you are perplexing Andrew, you have the diode stuffed with cathode going to Q303 and you have it drawn like the optional Zener. Use your DMM and see if you got any short after soldering, especially from Q303's drain to ground. Its impossible to have such high current in the Vref if there isn't an error somewhere.
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Old 20th June 2012, 01:59 PM   #1478
merlin el mago is offline merlin el mago
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Q303 drain to gnd 76R3
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Old 20th June 2012, 02:44 PM   #1479
merlin el mago is offline merlin el mago
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fixed

Q105 SK117GR S not connected to R106 also not connected to Q104 BC550C C simple adding a little of solder between G & S SK117GR and solved
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Old 20th June 2012, 04:09 PM   #1480
merlin el mago is offline merlin el mago
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Tested with scope no ripple

Finally I come back Vref area 1 red LED + 1K trimmer rest jumper
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