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<blockquote data-quote="vlammie" data-source="post: 479865" data-attributes="member: 270173">Hi LlewI finally have my AD3000 power supply working again. The problem was indead not on the primary side. I replaced IC1, but this did not solve the problem. I decided to solder out all the elco's on the secondary side and as you already suggested, some were bad. C23 was halve the original value (22 microF) and C16 had only 1600 microF left. Measured with a standard multimeter. So I can not predict there behaviour for the AC pulses they see when working in the power supply. I ordered replacements and finally the device works correct again. I tested the 5V digital output till 6A load without any problems. Voltage with this load was still about 4.5 V. Regarding the active device list i have found some differences. Q2 was 2SC3198, Q3,4 was 2SC2328 and Q5 was 2SA1273. IC2,6 and 8 were L9946. I also found another hot spot on my printed circuit bord. This was caused by R17 (1k, 1/8 W). This one seems to be a little small for this place. Replaced it with a 1/4 W type.&nbsp; R3 is 2 W in your list. I suggest to use a 3 W type on this spot. On your diagram I think C44 and C46 are swapped. I also could buy a second hand power supply from somebody in the Netherlands, who got it directly from Echostar in the Netherlands as a replacement unit. It has exactly the same hot spots around R3 and R17. Hopefully it won't break again soon. But now at least I have a spare part.Thanks again for your support, tips and suggestions. If I can be of any help, please let me know.Let it &quot;burn&quot; again forever )(-red<img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png"&nbsp; class="smilie" loading="lazy" alt=":)" title="Smile&nbsp; &nbsp; :)" data-shortname=":)" /></blockquote>

[QUOTE="vlammie, post: 479865, member: 270173"] Hi Llew I finally have my AD3000 power supply working again. The problem was indead not on the primary side. I replaced IC1, but this did not solve the problem. I decided to solder out all the elco's on the secondary side and as you already suggested, some were bad. C23 was halve the original value (22 microF) and C16 had only 1600 microF left. Measured with a standard multimeter. So I can not predict there behaviour for the AC pulses they see when working in the power supply. I ordered replacements and finally the device works correct again. I tested the 5V digital output till 6A load without any problems. Voltage with this load was still about 4.5 V. Regarding the active device list i have found some differences. Q2 was 2SC3198, Q3,4 was 2SC2328 and Q5 was 2SA1273. IC2,6 and 8 were L9946. I also found another hot spot on my printed circuit bord. This was caused by R17 (1k, 1/8 W). This one seems to be a little small for this place. Replaced it with a 1/4 W type. R3 is 2 W in your list. I suggest to use a 3 W type on this spot. On your diagram I think C44 and C46 are swapped. I also could buy a second hand power supply from somebody in the Netherlands, who got it directly from Echostar in the Netherlands as a replacement unit. It has exactly the same hot spots around R3 and R17. Hopefully it won't break again soon. But now at least I have a spare part. Thanks again for your support, tips and suggestions. If I can be of any help, please let me know. Let it "burn" again forever )(-red:) [/QUOTE]

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