Pioneer VSX-1022-K won't turn on

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

The zenner is a glass type and it is removed.

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

What that means if it's not the same?

It means there is still current flow through the transistor.
With no relay and zenner in circuit, it only leaves those two diodes in series that might be leaky. Both would have to fail to cause a problem, unlikely.
Actually most of the small glass diodes and zenners I find faulty is because the leads have rusted and cracked the glass body.

Had you removed the zenner from across the relay coil?

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

What that means if it's not the same?

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

The voltages on each side of the resistor should be the same after a reset while the relay and zenner are removed.

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

Yes.

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

Are those readings while the relay is still removed from the PCB?

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

Just plugged in, it shows 10.34V.
As I push the power button it shows 9.57V.
After reset toward the coil it shows 6.45V and the other side of the resistor shows 9.57V.

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

I will measure it tomorrow morning.

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

I would still like to know that voltage reading if you can, even without the relay fitted.

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

I have cut it open already.
I have ordered a new one, it's a special order item, it may take a couple of days to arrive.
Actually, I have tried with 12V and I may have left it a bit to much, because I have noticed some smoke came out of it. The coil it was still fine, still showing the 143 Ohm.

[markcenz]

Re: Pioneer VSX-1022-K won't turn on

Try to "wake up" the relay with 12v. If it clicks at 12v try again with 6v. Might work.

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

It seems that the relay is faulty. I would also like to make better sense of the voltages.

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

I haven't tested that yet. I have just removed the relay for testing. I have placed a 6V supply on the coil and didn't hear any click and I removed it.
I did hit it as you suggested, but it didn't happen anything.

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

What did the voltage on the supply side of R326 drop to?

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

Thank you for your help. I have made a mistake, by not testing the switch with an ohm meter. I have just applied 6V(coil has a 6V rating) and I didn't hear the click.
I have ordered a new one from partstore.com. It was $3.56 with free shipping.
I have cut it open and it seemed like the moving coil contact didn't move freely.
Now I will have to wait until they order one and arrives.
I will let you guys know how it went.
Rievax, you get a well deserved brake for now. Thank you again, for your prompt help. Let's hope that this relay is the culprit.
The parts has to arrive for the Yamaha, need to go back to that, today or tomorrow.
I guess, if everything is soldered well back together, everything should work, right?
I will eed to go v=back to a 46" Sony TV too. I'm having a hard time figuring out the problem with that too. I have repaired the same TV very fast, but this one it's the same as this Pioneer. Won't give up easily.

[markcenz]

Re: Pioneer VSX-1022-K won't turn on

I had a similar problem with a Pioneer 822 (same standby board as the 1022), turned out the relay is the culprit.

Relay read good via ohmmeter but was stuck in the OFF position. Unit won't power up even if the CPU sends "power on" signals to the relay driver. I used an external 12vdc supply to verify whether RLY301 is frozen or not. +12V to pin 4, ground to pin 3 of RLY301.

If you don't feel at ease with that method you can remove the relay from the board before testing.

[tibimakai]

Re: Pioneer VSX-1022-K won't turn on

Initially it gets 5.3V and then it drops to 4.5V.
I didn't win that receiver. It ended while I was asleep.
Why should I use 12V and where would I apply that voltage?

[markcenz]

Re: Pioneer VSX-1022-K won't turn on

Try powering up the relay with a different 12v supply. If it doesn't click it's defective. But before you do so REMOVE THE CONNECTOR THAT GOES TO THE MAIN TRANSFORMER.

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

I found the specs for the relay. It does have a 6v coil. The resistance is correct at 144ohms. It needs up to 4.5v to pull in. Did you remove the zenner across the coil?, ZD303.

http://www.handouk.co.kr/english/02_...oducts/hl3.php

[rievax_60]

Re: Pioneer VSX-1022-K won't turn on

Where should I look for the ripple? I have a Fluke 87V and a Rigol 1052E scope with the 100MHz hack(though I don't know how to use it).
Budm, mentioned about this in one of his threads, that he was checking the capacitors in one of the monitors and the ones that was showing some frequency were bad.
I have placed a bid, $40 with shipping. I have $90 in this receiver, I don't want to invest to much in it.

On the CPU_ST_VCC rail. Its the rail that goes to the relay coil.
The ripple should be 120Hz with all diodes working.
Try to remember my other suggestions also.