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  1. 73's de Edd

    Dead Power Supply

    Waiting for your monitoring of the units basic power reservoir . . . .that bank of electrolytics in the initially derived raw DC power section . That tells a lot. 73's de Edd
  2. 73's de Edd

    Power Supply Help

    Sir USER1 . . . . . . . Here are the foil paths to component layout relationships on your units PCB. I certainly would suspect the fuse, having been blown, if the unit below has any shorted internal diodes. Your units Full Wave Bridge Rectifier is located halfway between the upper 115...
  3. 73's de Edd

    Power Supply Help

    Sires . . . . . . . Clarification of . . . . . IF . . . .it is done . . . . . . as to . . . . HOW. . . .it is typically done : 73's de Edd
  4. 73's de Edd

    Power Supply Help

    Sir USER1 . . . . . . . Basically you need to test across the 4 diodes in the Black Full Wave Bridge Rectifier which is clamped against the marked, but non existent Heat Sink 1 . . . .HS1.. That would require that the 4 corner Phillips lag screws be removed and then wiggle the board to...
  5. 73's de Edd

    IC Top mark 56667

    Sir alok2010 . . . . . . . Once you said that a USB 3 port was being nearby, I then realized that those units were being ancillary to it . . .not being a resistor pack . . .but a protective varistor pack. Here is how they typically fit into a design scheme: GREAT chance . . . . . ...
  6. 73's de Edd

    Power supply dead Humax Freeview F2-Fox-T board

    Sir Martin . . . . I plotted out these board foil / compared to components . . . . . layout as an assist. To give us somewhat of an assurance of that mystery middle of connector voltage, would you measure the connector voltages on a good board connected to a system. I definitely have the 12V...
  7. 73's de Edd

    IC Top mark 56667

    Sir alok . . . . . Need a bigger pic of associated parts and / or board function. That 10 pin format doesn't equate with any IC I have known of. As it stands, it could just as easily be a resistor pack. Ohm out end to end, as five units being side by side and see if that has any repeats of...
  8. 73's de Edd

    Power supply dead Humax Freeview F2-Fox-T board

    Sir Martin . . . . Well I certainly wasn't expecting that " zero" RIPPLE figure, unless the supply is so out of whack, that it's not even letting the main unit pull any power. Since you DO have a capacitance meter the two related filters to the 3.3 v supply are being the ones just above and...
  9. 73's de Edd

    Can't find this symbol

    Sir Hsnopi . . . . . Not necessary for every cable being shielded, as you can see, they only deemed that audio line to be shielded. That shield line,and it's continuity is carried forward until some physical change requires a short carryover and then it starts again JUST after passing that...
  10. 73's de Edd

    Solar yard light stopped working

    . Sir AncientBeginner . . . . . . I feel that your desire, other than the proper operation of the unit again, would also be expanding your knowledge base and self satisfaction of figuring out the root cause of the problem on your own. The only other thought would be the stepping in of a...
  11. 73's de Edd

    Solar yard light stopped working

    . Sir AncientBeginner . . . . . . And YOU call yourself ancient . . .check me out ! . . . . .I just don't happen to fully fit the beginner aspect. I was initially leaning towards the sole ni cads/mh's also. BUT do you get almost all day FULL sunlight placement on the cells by their...
  12. 73's de Edd

    Bought a cheap soldering iron - should I be concerned about this?

    Sir Dzamija . . . . . . Mine cost 10 to 30 times the price of yours, and guess what . . . .they are doing the SAME THING ! They just RUN HOT, so expect some degree of metal discoloration near the area that the heating element is under. To keep mine looking as nice as possible and to keep...
  13. 73's de Edd

    Power supply dead Humax Freeview F2-Fox-T board

    Sir Martin . . . . Appears that your 3.3 supply is pulling down a bit excessively. You forgot to pass on the device I.D. of the 3 term regulator. Seems like it just might be a 7805 to me. Looks like the less demanded upon 12 dc supply might be normal. That last " high voltage" supply level...
  14. 73's de Edd

    Circuit diagrams of TORO DDC-4

    You are just fine on that selection of series connected resistors. What I really need to confirm is if the 9v battery is connected, is if it's apparent 7v loaded / or / weakened value appears across pins 1 and 16 of the relay coil. With all of the vias of this board, it's quite hard to confirm...
  15. 73's de Edd

    Dead Power Supply

    Sir BrianBro . . . . . . . Since that power supply is probably only going to handle a 20 amp output . . .reliably . . . first question will be how much is your test load with that mere 5VDC output ? Then, we need to analyze to see if the fault is being with the initial raw DC supply or...
  16. 73's de Edd

    Can't find this symbol

    Sir Hsnopi . . . . . . . Being a Mega-ditto of Sir Externet. Look at the top left mike element and its matching transformer T3 it then makes a very short run and then connects into P5/J1. After that, the "hot /sensitive " RED wire is being within a shielded cable, as designated by your...
  17. 73's de Edd

    Building DIY Vacuum tubes

    73's de Edd
  18. 73's de Edd

    fairchild mosfet taken from Mean Well TN 1500 inverter.

    . Sir aoud . . . . . . . The basic number that you are looking for is that very bottom number For the top numbers, they are suspect to be code date or production runs on the first part and the last two markings numbers are usually relating to pin treatment or casing variants. In these...
  19. 73's de Edd

    Power Supply Help

    Sir USER1. . . . . . I'm going to see what happens with a new one installed. (The same damn thing.) WHAT . . . . so that you might further / then do some more SERIOUS damage to it ? Got a DMM and familiarity with it, to do some preliminary tests ? 73's de Edd
  20. 73's de Edd

    Dead Power Supply

    Also its model number as they go back 30 + years. . . . . 73's de Edd
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