Pioneer VSX-1021-k

[NickLoC]

Re: Pioneer VSX-1021-k

OK. Sorry not a pro here. I know i see allot of times they say to pull the part to test fully. I normal try to test without pulling lol

[NickLoC]

Re: Pioneer VSX-1021-k

OK. Thanks for the info.

[mmartell]

Re: Pioneer VSX-1021-k

Just set your meter to continuity (beep) test and touch the legs in various combinations. There should be no sustained beeping.

[mmartell]

Re: Pioneer VSX-1021-k

OK. Sorry not a pro here.

Ya me neither but since we aren't repairing Life Support systems I feel ok giving out what little nuggets I may have picked up along the way

Do the above test with unit unplugged btw.

[tibimakai]

Re: Pioneer VSX-1021-k

You may have to remove a board or two on top, but you should be able to reach the transistors.

[NickLoC]

Re: Pioneer VSX-1021-k

All seem to test fine. No shorts. Am I missing something?

[CapLeaker]

Re: Pioneer VSX-1021-k

I wonder if there is proper power to the amp board?
Is the FL OFF light still blinking as indicated in post one?
Cording to the manual:
There is a problem with the receiver's power unit or fan. Try turning on the power. If the same thing happens, the receiver is damaged. (Other symptoms may appear when the power is turned on.)

[NickLoC]

Re: Pioneer VSX-1021-k

No fl light blinking. Just mcacc light. The amp started acting up awhile ago. Would work great for a while, then click off and fl light flash. Now it's the mcacc light

[CapLeaker]

Re: Pioneer VSX-1021-k

Hmm... O.k. Different approach...
Service manual page 34. Put the amp in "test mode" and see what code she gives.
Service manual page 32, 5.3 Overload and DC Protection circuit. What is the voltage on IC3004 on pin 71 and pin 80?

By the way... did you have the amp totally assembled correctly before testing? If not the protection circuit will be activated. That's on page 38.

[NickLoC]

Re: Pioneer VSX-1021-k

Will have to try that later. Will let you know

[NickLoC]

Re: Pioneer VSX-1021-k

So that is on the HDMI board? How do I test the pins on that ic? Really small. And when? Do I have to try and turn it on and read it within a certain time?

[CapLeaker]

Re: Pioneer VSX-1021-k

Look at page 32 and 33 on the SM. IC3004 is on the face somewhere (front assembly). You can chase that through a few boards ending on the amp board.
I'd like to see the protection code the amp is shutting down with, to see to what pin guide you to. Other than that, you have to read page 31 on the SM and check the pins that are mentioned there. To measure the pins, have the DMM set to DC, negative lead to chassis GND, put positive probe on pin 80 and turn the amp on. Observe the readings for 10 seconds. Do the same on pin 81.
Instead of chasing through the pins on the IC, you also could find the DCDET lines on the amp board (page 32).

[Agent24]

Re: Pioneer VSX-1021-k

OK. Sorry not a pro here. I know i see allot of times they say to pull the part to test fully. I normal try to test without pulling lol

Yes, to check a component 'properly' it must be done out-of-circuit, because other parts in parallel may throw off any measurements.

BUT, when a part is shorted, it is very obvious. Doesn't matter what is in parallel with a short, it will still read short when you measure across it.
Imagine as if you were trying to measure a resistor (any value) while your probes are shorted together with a piece of wire...

Once you find a part that appears to be shorted, you would of course remove it, and test again to ensure you are correct. If the part then did NOT appear shorted, you would look for something else shorted in parallel with it on the board.

[NickLoC]

Re: Pioneer VSX-1021-k

Still have not had time to test further. Guy on eBay says the amp board is good and they tested it and says the amp board is not shorted. So will be doing the test stated here when I have some time

[CapLeaker]

Re: Pioneer VSX-1021-k

Unless I know what I asked for on post #29, we are stuck. The error signal has to come from some where.

[NickLoC]

Re: Pioneer VSX-1021-k

Pin 80 on ic3004 reads 0 volts. Pin 71 reads 4.5 volts. Un plugged connection from the IR board that connects to the amp board and I get an amp overheat error. Plugged back in the amp just shuts down. No error code. Can not get into service mode. Amp shuts down trying to.

[CapLeaker]

Re: Pioneer VSX-1021-k

unplug it again and see if it comes back. unfortunately the SM just sez "other trouble" to that new fault. All you can do now is verify your cabling... maybe something isn't correctly plugged in... dunno...

[NickLoC]

Re: Pioneer VSX-1021-k

Does anyone know what the specs are on the out put of the main transformer? Would like to test it. What voltage an i supposed to see on those two pins on that ic?

[Jefftra2]

Re: Pioneer VSX-1021-k

Trying to find out if you ever resolved your issue. A friend of mine gave me his VSX1021k with the MCAAC red light flashing and I'm trying to fix. If I release from protected mode, it powers on for about 3 seconds and back off. I removed the entire amp board from the unit, when I turn it on without it, the error message says amp overheat. Not sure if that tells me anything. Are the final transistors the ones attached to the heat sink? One post mentioned if you find a shorted transistor then cut the legs off. Would this be to separate from the board temporarily to see if it will power on? Where can I get a new transistor if I have a defect one?
Thanks

[dobrykamil]

Re: Pioneer VSX-1021-k

Trying to find out if you ever resolved your issue. A friend of mine gave me his VSX1021k with the MCAAC red light flashing and I'm trying to fix. If I release from protected mode, it powers on for about 3 seconds and back off. I removed the entire amp board from the unit, when I turn it on without it, the error message says amp overheat. Not sure if that tells me anything. Are the final transistors the ones attached to the heat sink? One post mentioned if you find a shorted transistor then cut the legs off. Would this be to separate from the board temporarily to see if it will power on? Where can I get a new transistor if I have a defect one?
Thanks

Looks like you have exact same issue as I've had with my VSX-527. I guess your model has 2 protection lines too, one for front and possible center speakers and the second line for back and surround speakers. If you switch it on without amp board,unit will display OVERHEAT error. Resetting to default settings doesn't clear that error.I believe, the main microprocessor still "remembers" that something has happened before at the power transistors level, and will not work until it gets the "signal" (like 0.4-0.6V) from working pair of power transistors. Once I've replaced them (front right channel in my case) the error was gone and unit start to work again.