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  1. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Thanks bushtech, I thought for a moment Michael was talking about Tea and scones. Lol
  2. Tha fios agaibh

    Denon AVR-1912 E2/EA

    We are getting very close I think. Tp406 could be 0v because either Darlington Q464 or Q470 is open. Also, nearby Q463 base is likely being pulled negative which would forward bias it to send the Tr_Thermal fault. You need to look over this circuit, and I need coffee asap. BTW, what does CA...
  3. Tha fios agaibh

    Denon AVR-1912 E2/EA

    I need to re-read procedure but,... doesn't it have to be in MCH Mode before adjusting? If it's not in the proper mode, the proper channels may not be active. Yes I agree, TP406 should be addressed first. The voltage has to be going somewhere. The good news is, if you end up knee-deep in this...
  4. Tha fios agaibh

    Denon AVR-1912 E2/EA

    "There's nothing to indicate, when adjusting the VR's, whether the 2mV. is taken from TP pin1 - 3 or from pin1 - AGND and from pin3" Michael, put your spectacles on.
  5. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Never understood piano pedals. At least they didn't help my playing. lol. MCH = Multi Channel 2mv, Not 2V, Right?
  6. Tha fios agaibh

    Denon AVR-1912 E2/EA

    First, I would put the test points back to 2mv, if you can. Tr_Thermal is on CN8 pin 5, and a few other places,.... The amp board if i recall correctly. If Tr_Thermal (Thermal B fault) has any significant voltage, it's safe to say it's an active fault. Edit: See page 106. CN404 pin5. Should be...
  7. Tha fios agaibh

    Denon AVR-1912 E2/EA

    The former. All test points can be set 2mv at once. Then, after 10minutes or so when temp has stabilized, they all can be tweaked up to 3mv. Obviously that isn't going to happen if you only have 5 seconds to work with. I think you should put all these test points at 2mv for now so any...
  8. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Michael can you measure the voltage at Tr_Thermal? I suspect it's being pulled high by one of the following; Q403 (FL), Q427 (C), Q451 (SR), Q463 (SBL) Each transistor has a resistor on their collector that could be pulled to isolate where the voltage is coming from. For example, R412 could be...
  9. Tha fios agaibh

    Denon AVR-1912 E2/EA

    It thinks it's getting hot because the cpu input. It may not be hot at all, just reading funny voltages.
  10. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Q451, or Q463 triggers the Thermal B. I think Tr thermal is telling you a transistor is overheating. How many components are on that heat sink? I predict some invasive surgery is warranted.
  11. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Page 129 shows pin 5 Themal B from amp
  12. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Yes, I'm thinking one of those Darlington transistors may be shorted. Are there two heat sinks, one for left and right? It is the left side that is out correct? Any chance you can post some pictures?
  13. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Ah, perhaps we should turn back the pots and see if we can recreate that scenario where it doesn't turn off? I'll have to read up on that section, and try and find out where the pots are on the schematic (if I can carve out some time). If you can figure out which pot is causing it to go into...
  14. Tha fios agaibh

    Denon AVR-1912 E2/EA

    The display does work, that's a big plus. I would forget about F102 for now. I was just looking as to why the display may have lost power. I'm forgetting the chronology of events. At one point, the power came on and stayed on for a long time, correct? At what point did it start switching off...
  15. Tha fios agaibh

    Denon AVR-1912 E2/EA

    I saw this on the web. I think protect mode has to be reset.
  16. Tha fios agaibh

    Switching high currents

    Yes, I was also assuming 90A steady state current, so @ 60ms the current may only be a few amps or so? I don't see a problem switching with a SCR but not nearly as quickly. The irony is, a blocking diode to protect a mosfet from flyback will also slow down the coil from de-energizing.
  17. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Yes, Monday. No shame needed. At least you are see the oversight. If screen still out post plugging in all connections, Swm3.3 originates here on page 117. What to do next? Well, (my best Brit accent) It's about tea time, isn't it?
  18. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Page 130. Any chance you've popped fuses F101 or F102? Do you have +3.3 ON Pin 3?
  19. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Ok, just trying to eliminate the possibility that something you have connected may have a short. If your confident your test tails are secure, by all means leave them if you need further testing. Do you still have +/- voltage rails where it needs to be? When I asked to verify analog out, I...
  20. Tha fios agaibh

    Switching high currents

    I guess the question is; What does it draw in 60ms? I would be looking for a SCR to drive it. I don't follow. Why only pulse an electromagnet for only 60ms every few seconds? I don't see it delivering enough current for the magnetic field to build.
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