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  1. 73's de Edd

    Fisher Studio Standard CA-880 Amplfier

    . Sir Slice4444 . . . . . That's one fine old unit . . . .my brother in law had one that I had to repair in the past . . . . you certainly have discriminating tastes . . . . With your found, "slowly blowing" 5 amp fuse, BLACKENED internally, indicative of a severe overloading being...
  2. 73's de Edd

    Searching part number for 690KE

    . Sir KSB . . . . . If this is sampling a 5V VCC line: I think that your mystery SMD, KA coded device is going to be a KIA7042 . To test, just place the scope in DC coupling mode 1V DC Vert sensitivity, place in auto triggering mode, at a slow / high millisec hoz sweep rate and probe to...
  3. 73's de Edd

    Weller PU81 Soldering iron

    I answered on your private conversation that you sent me
  4. 73's de Edd

    Multimeter

    . Sir Jimmie . . . . . If all of the other functions are OK on that Simpson "wanna be ", then compare its components against the schema below and see what might be bad along the GREEN ARROW path of the AC function of the unit. 73's de Edd .
  5. 73's de Edd

    Help me draw this circuit's diagram

    Sir mosfet66 . . . . . . . . I made two 1X side by side dupes of your circuits component and foil sides and placed the guesstimated schema just below them . Your component interconnects, I have marked up in PINK lines. I checked out your perfboard creation . . . . . and by my green check offs...
  6. 73's de Edd

    Need a Circuit Schematic for a Lambda Model LPD-424A Power Supply

    Sir Cerberus . . . . . . https://www.google.com/search?q=katzenjammer+kids +cartoons&newwindow=1&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjjn_nJ8I_KAhVE32MKHRoMCtsQ_AUIBygB&biw=1536&bih=710#imgrc=_ "I gave each of the pots a thorough spraying with contact cleaner and it helped somewhat" I...
  7. 73's de Edd

    Help me draw this circuit's diagram

    Sir Marco . . . . . Hmmmmmmmmm . . . .I guess that I got off on the LM556 path since it had been so long since the topic was initiated. But I do see that my original mark up had LM 324 clearly placed upon it and I cleared its area in my later drawing to create the blank PCB proper such that I...
  8. 73's de Edd

    Corning PC-620 120V 1113W Repair

    . . Sir East Coast Toast . . . . . . Ahhhhh yes . . . . . I've certainly seen that CTS unit and switch . .with pcb mount bracket and solder terminal tabs . . . . in many years past. The 37th week of 1997 . . . . . to be specific . . . .for that unit of yours. If my problem to solve, I would...
  9. 73's de Edd

    Trouble understanding circuitry for guitar pedal project

    . Sir Hugh Notman . . . . . . . Redraw . . . .we call for a . . . . .REDRAW ! Here is a redo with a more logical signal path "flow pattern" and all of your grounds being clustered to a common buss.. You need to use audio taper pots for the gain and volume controls, or you will learn...
  10. 73's de Edd

    Corning PC-620 120V 1113W Repair

    . Sir Eastern Coasr Toaster . . . . . . If the 10x10 unit is the first unit concerned with, there are 2 triacs, with the one at the end of the board being bolted to the CAST aluminum /?/ Pot metal housing, which should almost be an infinite heat sinking if silicone grease or heat sink...
  11. 73's de Edd

    PSU Repair- Transformer outputting wrong voltage. Help much appreciated =)

    . Sir jamman1125 . . . . . . . .My prior info was more related to why a person would be confused by imbalanced reading on a transformer with duplicate windings. With a given, that unloaded transformers will potentially read higher voltages, than when being loaded down. I am used to seeing a...
  12. 73's de Edd

    Help me draw this circuit's diagram

    Sir mosfet66 . . . . . . I think it will be a universal "given" that the brownish/grey component to the left is going to be a layered ceramic SMD, but the center bottom one and and its white ceramic substrate is going to be a bit more " iffy" in its confirmation . I was just going to rely...
  13. 73's de Edd

    PSU Repair- Transformer outputting wrong voltage. Help much appreciated =)

    . Sir jamman . . . . . . I also am having to rely on your "micro pictures" but I CAN see that you are measuring AC voltage at a connector coming from the T-former. Thereby you are measuring STATIC voltage . . . .you need to be measuring a DYNAMIC voltage, (under load). To measure DYNAMIC...
  14. 73's de Edd

    Help me draw this circuit's diagram

    ... Sir mosfet66 . . . . . . The ohmmic test needs to be performed with the caps out of circuit, as you probably are receiving "phantom" resistance shunts produced from within the IC or adjunct components circuitry. To fully interpret this units design, we also need to know any and all...
  15. 73's de Edd

    Help! Repairing water damaged PCB from Massage chair.

    Sir Jonawald . . . . . I'm coming in waaaaay late on this post but I will give my evaluations on the best photographed board that I have marked up , and would only be able to make out more if having its foil side straight on, and about the same size and with minimal lighting reflections. If I...
  16. 73's de Edd

    Corning PC-620 120V 1113W Repair

    . Sir East Coast Toaster . . . . . . . . Whhhhhoooooooooops . . . . . . looks like I addressed you with another posters name, last time around. UNLESS your hand slips while taking a measurement . . . . .then you might fully fit those parameters along with your also being a VERIFIABLE...
  17. 73's de Edd

    Exactly what component is this?

    . Sir oxidator . . . . . . . . .the oxidat"ee" here . . . . MAMMA MIA !. . . . .here's a what cha do . . . . Scrape a longitudinal strip of the "salmon" overcoating off, to access the prior covered resistance element for ohmmic probing and then see if either lead to center of the resistor...
  18. 73's de Edd

    Weller PU81 Soldering iron

    Correction: Pins 1 and 3 are the receptors of the 24 VAC which heats your irons element. Should be: Pins 1 and 2 are the receptors of the 24 VAC which heats your irons element. The 24 VAC comes in to pin 1, flows thru the heating element and exits from pin 2, which passes to the Triac and...
  19. 73's de Edd

    Weller PU81 Soldering iron

    . Mistah biccles . . . . . . . . . This unit typically takes about 15 seconds from cold to being at soldering temperature Considering that the main unit looks good and that the unit is putting out 24VAC to feed to your unit, lets look at its supposed schematic below: There seem to...
  20. 73's de Edd

    Corning PC-620 120V 1113W Repair

    . Sir Sparky . . . . . Are we having fun yet ? I'm using your good second set of photos, showing both sides of the board paired up . . .which I usually have to prep up myself. Now I'm only having to do its mark up. Here are the connections and the power flow path for that board...
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