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  1. Tha fios agaibh

    Denon AVR-1912 E2/EA

    She's quite the conundrum, isn't she? I must confess that I keep forgetting how invasive it is to access test points. It's one thing looking at the schematic, but another working under such restraints. Soldering long leads to tiny smd components is not practical and could possibly cause other...
  2. Tha fios agaibh

    Motomaster Eliminator Powerbox - light issue

    I'm glad that worked for you, but it'll probably happen again if under a heavy load. If you want to take the case apart, remove the battery and look behind it for additional screws. Sometimes they're also hidden behind stickers or decals.
  3. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Why? Just measure emitter to ground voltage to see if you have 5v + (standby power). Then measure base to ground. This should be about 0.7v less than the emitter (4.3v or less) in order to forward bias it. If there's a negative current on TR16 base, it should be switching on and sending voltage...
  4. Tha fios agaibh

    Denon AVR-1912 E2/EA

    I'm not sure, but it looks like TR16 must first have standby power at its emitter and TR17 base must have a current from cpu power in order to pass SWM5V. Getting to the wee hours of the morning here. I'm getting too tired to follow along. Btw, I'm always amazed at how cats can curl their...
  5. Tha fios agaibh

    Denon AVR-1912 E2/EA

    I agree, a bad connection could be causing intermittent problems. Not a bad idea to clean the plug/receptacle connections with alcohol or contact cleaner. Like I said before, you found one bad ribbon cable already, so there's a good chance there's another one somewhere else. I dont remember...
  6. Tha fios agaibh

    Old School House Wiring

    Not necessarily. I have come across many jobs that still have old cloth weave insulation. There is nothing wrong with it provided the integrity of the insulation is still intact. There are circumstances when it should be changed out, such as in a ceiling junction box where the light fixture...
  7. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Yes, I mean pins 21 & 23. It'd be great if you could get an output on these pins. I would certainly try all the different input selections and settings to try and make that happen. I can't explain the discrepancy between Ic801 on p114 and p168 but p114 should be trusted because that's the way...
  8. Tha fios agaibh

    Career guidance advice please

    The best answer is probably to follow your heart/passion. Having done field service work in the past, the downside is traveling. It gets old fast. I have also been given the third degree of interrogation by security many times by having wiring and electronic boards in my suitcase and that was...
  9. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Yes I remember, but I can't imagine the Darlington final stage of amplification knocking out your line level signal so far up-circuit. I understand wanting to see if IC30 is doing it's ADC job. By all means hook up your scope and see if you have a digital heartbeat. I would say to read the...
  10. Tha fios agaibh

    Denon AVR-1912 E2/EA

    From your description it sounds like you're getting to know this thing like the back of your hand. A few thoughts; Originally the Right channel worked but the Left cut out. Correct? I wonder why we don't even have the right channel now. Are all the settings the same? Is your Source set to...
  11. Tha fios agaibh

    Denon AVR-1912 E2/EA

    It looks like after it leaves IC30 it arrives at IC21 on pin 24 then exits on pin 21. Wish I was of more help to you but digital is not my forte. You should read a slight voltage on the digital side to prove its not dead but other than that I can't say. Yes, your scope should give an indication...
  12. Tha fios agaibh

    Denon AVR-1912 E2/EA

    So you're saying nothing work other than the signal you trace to the point before cn401? In other words, you've hooked up speakers and do not get any kind of sound through the amplifier? Radio has no output? You've plugged in headphones and there's no sound?
  13. Tha fios agaibh

    Denon AVR-1912 E2/EA

    At this point I might change tactics from trying to pinpoint the exact signal path to just a general evaluation of what works and what doesn't. Perhaps you've done this already but I'm not aware of the synopsis. Try feeding line level audio into each input jack and with the proper input...
  14. Tha fios agaibh

    Denon AVR-1912 E2/EA

    There's no knob. Its a function of the set-up mode that you follow on screen. Example, (on my set-up) it walks you through it and asks you if your speakers are large or small, how many feet/meters away, and a number of other questions in order to customize output to your surroundings.
  15. Tha fios agaibh

    Denon AVR-1912 E2/EA

    Michael, Try not to be disheartened. This may not be that big of a deal. Perhaps a bad plug or ribbon cable? Take courage in the many successes you've had. Such as overcoming the protect mode, finding shorted mosfets, bad caps etc. If you discovered that you had your signal but IC801 was not...
  16. Tha fios agaibh

    Sharp R1830 Microwave/Convection oven

    Could be a number of things. The voltage spike may have damaged insulation and its shorting out somewhere when it heats up. The circulation fan used for convection may be shorted out. You could try to unwire it temporarily to see if problem goes away. I would try to discern exactly where...
  17. Tha fios agaibh

    Denon AVR-1912 E2/EA

    On my Avp, I know if it's not set up correctly a channel (speaker output) may not even work. For instance, the speaker selection can be set to "none", or the channel volume level could be set so low the output can barely be heard with the master volume knob turned all the way up. Good luck with...
  18. Tha fios agaibh

    Reading 5V on a neutral wire? Hot wire going to ceiling fixture first.

    Actually, both of the statements are wrong. Neutral and Ground are often bonded together at the source, but they are Not the same. A neutral carries unbalanced current while a (equipment) ground only carries current when there is a fault. And as Minder mentioned, a Neutral can also be used for...
  19. Tha fios agaibh

    Reading 5V on a neutral wire? Hot wire going to ceiling fixture first.

    He is the expert. He doesn't need you to tell him what to check or fix. You likely have a slight voltage imbalance on your system which is generally not a problem. Nevertheless, not a bad idea to have it looked at.
  20. Tha fios agaibh

    Denon AVR-1912 E2/EA

    I know your injecting manually but the test tone Menu should look like this if interested:
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