Pioneer VSX-1022-K won't turn on

[tibimakai]

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

At the relay's coils I measure 10.5V. This voltage shouldn't turn on the relay?
There is also a zener diode D303 which looks like a 7.5V zener diode. There it shouldn't be a 7.5V at the relay?
On one side of the R319(transistor side) I'm measuring 0.73V and at the other side 3.3V while I'm resetting the receiver.

[rievax_60]

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

At the relay's coils I measure 10.5V. This voltage shouldn't turn on the relay?
There is also a zener diode D303 which looks like a 7.5V zener diode. There it shouldn't be a 7.5V at the relay?
On one side of the R319(transistor side) I'm measuring 0.73V and at the other side 3.3V while I'm resetting the receiver.

The 10.5v will only turn on the relay if the bottom end of the coil is grounded by the transistor. The 0.73v at the Base indicates that the transistor is being turned on.
Have you checked under the PCB for problems?
The zenner is there to limit the voltage across the coil to about 7.5v.

[tibimakai]

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

At the coil there is 10.5V and not 7.5V.
Last time I have checked all the components, except the capacitors.
The electrolytic ones are Samyoung, which I know they are not good brands, at least in TVs.
Should I replace them just in case?

[rievax_60]

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

At the coil there is 10.5V and not 7.5V.
Last time I have checked all the components, except the capacitors.
The electrolytic ones are Samyoung, which I know they are not good brands, at least in TVs.
Should I replace them just in case?

I wouldnt bother replacing capacitors at this stage. Is the transistor turning on?

[tibimakai]

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

Coming back here.
That 0.74V it's only there, when I reset the receiver. Otherwise is only 0.003V.
When I turn on the receiver, the voltage drops to 9.6V and then back to 10.5V.
I will have to check on the other transistor, I don't remember right now if it's there or not.
It's clear that Q303 is not getting the signal to turn on the relay.
It shouldn't turn on the relay when I reset the receiver? That 0.74V it's not enough to turn on the transistor?
How can I check the relay, if it's good? It has 143 Ohm at the coil.

[rievax_60]

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

Coming back here.
That 0.74V it's only there, when I reset the receiver. Otherwise is only 0.003V.
When I turn on the receiver, the voltage drops to 9.6V and then back to 10.5V.
I will have to check on the other transistor, I don't remember right now if it's there or not.
It's clear that Q303 is not getting the signal to turn on the relay.
It shouldn't turn on the relay when I reset the receiver? That 0.74V it's not enough to turn on the transistor?
How can I check the relay, if it's good? It has 143 Ohm at the coil.

I expect that the relay should be turning on when the receiver is reset. That is the reason the STBY_RLY line is going high for a few seconds.
Q301's Collector should go from 10.5v to something less than 0.5v.
Its the voltage that is applied across the coil that matters.

[tibimakai]

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

Should I place both probes, over the two coil terminals and measure it that way, while I reset it?

[rievax_60]

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

Should I place both probes, over the two coil terminals and measure it that way, while I reset it?

Yes, if it can be done safely. Did you ever check the voltage change on Q301's Collector?

[tibimakai]

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

At the Collector I measure 0.6V when I reset the receiver.
At the coil, I measure 4.5V when I reset it.
Q303 is fitted. Voltages are very low, 0.6V, 0.013V, 0V. Doesn't change much, after reset.

[rievax_60]

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

At the Collector I measure 0.6V when I reset the receiver.
At the coil, I measure 4.5V when I reset it.
Q303 is fitted. Voltages are very low, 0.6V, 0.013V, 0V. Doesn't change much, after reset.

If R326 checks ok, try removing the zenner.

[rievax_60]

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

At the Collector I measure 0.6V when I reset the receiver.
At the coil, I measure 4.5V when I reset it.
Q303 is fitted. Voltages are very low, 0.6V, 0.013V, 0V. Doesn't change much, after reset.

These readings dont agree with previous readings. You said the voltage at the coil drops from 10.5v to 9.6v.

[tibimakai]

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

The 9.6V is measured from the ground and the 4.5V across the coil.

[rievax_60]

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

The 9.6V is measured from the ground and the 4.5V across the coil.

Those voltages still dont add up right. Replace C301 if nothing else works.
I think the relay has a 6 volt coil.
We might have reached a dead end.

[tibimakai]

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

I will check them again. I have wrote those numbers from memory, I may have missed something.
I will replace that capacitor. I know at TVs a bad capacitor can bring down the whole TV.
What would happen, if we were closing the contacts of the relay?

[rievax_60]

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

I will check them again. I have wrote those numbers from memory, I may have missed something.
I will replace that capacitor. I know at TVs a bad capacitor can bring down the whole TV.
What would happen, if we were closing the contacts of the relay?

If the micro realizes that its not in control of the relay, it might decide to do nothing else.
The timing has to be close to right.

[tibimakai]

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

I have replaced the 2200uF capacitor and it did not help.
OK, I have checked everything again.
At the coil(top part, away from the transistor) is 10.4V in stby and 4.64V after reset.
At the coil connection(transistor Collector) is 10.4V in STBY and 0.6V after reset.
R319 toward the CPU, after reset is 3.1V and at the other end is 0.75V.
Q301 Base is 0.06V, Collector is 10.4V and Emitter os 0V in STBY.
Base is 0.75V, Collector is 0.061V and Emitter is 0V after reset.
What Q303 does? What is PDN?
We have checked the protection modes, if they are turned on or not?
I feel bad about this, that I'm not letting it go. Maybe I should pick up another one and compare them.
There is on on Ebay without HDMI board and amp section, should I pick it up? The problem is that I don't know, what issues has that one also. Maybe bad HDMI board and everything else is good?
I appreciate your help a lot. It seems that only you are helping me in this forum section.

[rievax_60]

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

Q303 signals to the micro that the mains power has been turned off for some reason like a blackout or simply turned off at the outlet. The micro then saves all current settings like Volume and also turns off the speaker relays so the speakers dont thump.
Is R326 ok?
Did you try removing the zenner from across the coil?

[tibimakai]

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

I will have to check that resistor. Ones, I have went through all the parts and they all checked out good.
I haven't removed the zenner. Should I try turning on, without it?

[rievax_60]

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

Yes, Im hoping that the zenner is faulty causing too much current to be bypassed arround the coil. If the relay does work, dont leave it on for more than a few minutes, it might overheat without the zenner.

[tibimakai]

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

The resistor is good.
Zenner diode removal, didn't do anything and it's good too.