Home Theater Questions? Ask a Technician for Answers ASAP
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, have you tried the user's RESET? please click HERE.
As it implies, a reset would force the unit to revert back to factory defaults removing glitches and config errors but would include memories, presets and user preferences.
May have to be done a number of times.
This is very critical - a reset however would not be corrective of an internal hardware concern; but it would be confirmed. In some instances, it may even expose other issues.
If not corrective, then there is still a last chance technician's RESET before attempting an internal repair.
The Pioneer can not be put into STANDBY mode?
Have you tried unplugging say for 5~10 minutes? ...and then just plugging back in?
Likely what is available/referred to is the Operating Instructions.
I was merely following procedures as prescribed by the two (2) Service Manuals (not the Owner's Manual) for the Pioneer VSX-1124-K hence the above. And as posted earlier, "...there is still a last chance technician's RESET before attempting an internal repair...."
Perhaps a second opinion / alternative approach by another member be more to your preference?
The display on the TV screen is not a factor in trying either the User or the Technician's RESET procedure. What is important is that the procedure be done from a STANDBY mode. Thus the foremost requirement is to be able to put the VSX-1124K to standby mode; i.e. the MCACC light has not yet engaged rather than be able to see anything to the TV.
Have you tried unplugging the Pioneer for an extended period of time; even a couple of hours? ...and then plugging back in but with no speaker/speaker wires connected?
Appreciate your kind understanding and would look forward to an update when able.
If the unit is not able to go into standby mode, then even the technician's RESET would not be doable.
This would then confirm an internal hardware issue.
If comfortably able and feel safe to do so, are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?
As posted above, it would be an internal hardware issue.
Would you be comfortable working on the circuitry with guidance? ...and do you have access to a multi-meter and a soldering iron?
I understand. Please post back tomorrow evening or when able with the multi-meter.
Thank you for your patience; was mobile when your reply was posted.
Please click HERE for the description of the MCACC blink fault. The most likely cause of this DC voltage across a speaker terminal would be if either or both of its output transistor has failed. With this, preliminary test would be to determine which of the red & black speaker terminal pair would yield a momentary DC Volts reading on powering on. This would help narrow down to which of the nine (9) pairs would be highly suspect.
If no DCV is read or unable to perform this preliminary test, then all eighteen output transistors would have to be checked out-of-circuit.
The output transistors are the big transistors attached to the big aluminum heatsink. Most versions would have 2SD2390 and 2SB1560 paired.
Test would be for forward and reverse of base-to-emitter, base-to-collector & collector-to-emitter.
It has to be posted that it is also possible for the smaller driver and pre-amp transistors to have failed and driving the output to err.
In some others, an uneven ± V (even from the output of regulators) would cause an unbalanced voltage condition thus and can cause also the output to err (show failure).
I'm afraid yes.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; it is either repair or replace.
Sorry for having to be the bearer of bad news.
The "..used one of your cures for other Pioneer machines that I found elsewhere. I did the tune down and multi-zone off and I got it to power up..." was the technician's RESET.
That "..got it to power up long enough to go display the amp err and then immediately go back into protect mode..." is inline with the "..This is very critical - a reset however would not be corrective of an internal hardware concern; but it would be confirmed. In some instances, it may even expose other issues...."