Pioneer VSX-1021-k

[NickLoC]

So my amp was working, but would cut out while listening to it. Then the "FL Off" light would flash. Finally it will just turn on, then after a couple secs it will click off and the "MCACC" light will flash. Tried doing the release mode and it will try to power back up but do the same thing. I just replaced the AMP board and it does the same thing. Could it be the Main PCB with the speaker connectors on it? I tested the voltage from the power board and it seems fine.

[NickLoC]

Re: Pioneer VSX-1021-k

Does anyone have any ideas on this one? I have the service manual

[CapLeaker]

Re: Pioneer VSX-1021-k

Did you do a master reset yet? Or did you mean with release mode the reset? Any error codes that you can retrieve? FL Blinking and MCACC usually means you've blown something in the output stage. So I would think it is in protect mode.

[tibimakai]

Re: Pioneer VSX-1021-k

Usually, the first thing that I'm doing, when I open a receiver like this, is to check all the final transistors for short.

[NickLoC]

Re: Pioneer VSX-1021-k

I did a release mode. The amp board was replaced. As far as finall transistors are you talking about on the speaker board? When I plug it in the mcacc light just flashes. If I release it, it powers on them after a few secs it clicks of and the mcacc light just flashes

[CapLeaker]

Re: Pioneer VSX-1021-k

there is a short in either the finals or in the drivers. There is DC on the outputs and that's why the amp shuts down and goes into protect mode (mcacc light blinking), no sound.

[tibimakai]

Re: Pioneer VSX-1021-k

Check all the final transistors, mounted to the heatsink and if you find shorted ones, cut all there legs and then try to turn it on.

[NickLoC]

Re: Pioneer VSX-1021-k

I have replaced the amp board, the one with the heat sink. So could it be these ones?

[mmartell]

Re: Pioneer VSX-1021-k

Where did you get the replacement amp board ?

[CapLeaker]

Re: Pioneer VSX-1021-k

I have replaced the amp board, the one with the heat sink. So could it be these ones?

No, not that board. It would be that what you have replaced (the board with the large heat sink on it). I've managed to get the service manual for it and it says exact that, what I said in post 3. You can read it yourself on page 31.

For some reason I can't upload the SM right now, so here is the link:

You have to wait like a minute in order to actually get the down load link on the bottom. Wait for the "Get manual" link.

So you are down to testing the finals.

[tibimakai]

Re: Pioneer VSX-1021-k

Yes, you should to a reset first.
On the 1122k, is Tuner up and Multizone on/off for 5 seconds.
Don't remember what is on 1021k.
Here is one on Youtube:
https://www.youtube.com/watch?v=DSX5SrZgrkU

[NickLoC]

Re: Pioneer VSX-1021-k

I got the board on eBay. I know it's possible to get bad parts. I just hate to ship it back. Can't go cutting on a part if I need to return it. I'll try the reset. So this is the only possibility? I do know it's going into protect mode. I do have that service manual already.

[NickLoC]

Re: Pioneer VSX-1021-k

Tried reset and it fails. Have to do release mode to get it to turn on, then immediately turn it off before it goes into protect mode. Then I held enter and standby, it asks if I want to reset, and before I can hit yes it clicks off with the mcacc light flashing.

[CapLeaker]

Re: Pioneer VSX-1021-k

either the driver, the final or both in one or more channels has a short. That puts DC on to the output terminals. In order to save your speakers there is a relay. If it detects DC, it won't click and hook up the finals to the speaker terminal. Could be that on top of the blown final, bad resistors and zener diodes are toasted too. Not sure if you are comfortable fixing that or not.

[NickLoC]

Re: Pioneer VSX-1021-k

So looks like I need to send that amp board back? I have replaced parts before. Was hoping this would be an easy fix to just replace the whole board.

[tibimakai]

Re: Pioneer VSX-1021-k

Measure those transistors for short.
We said this already a couple of times.

[NickLoC]

Re: Pioneer VSX-1021-k

Will do that. But I have a limited time for refund. If any part of the board is bad I must send it back. Sorry haven't had time to test. Thanks for the info. Will post back after testing

[mmartell]

Re: Pioneer VSX-1021-k

Are the transistor legs not accessible from the top ?

[NickLoC]

Re: Pioneer VSX-1021-k

No. On the bottom. I can only test them in place on the board. I know I need them out to test properly, but if I mess with the board I void the warranty on the part. That is my problem. I think I will send the board back and then test the old one I pulled. Then I can desolder parts and test properly.

[mmartell]

Re: Pioneer VSX-1021-k

Bah if they're shorted you won't need to take them out to test them.