Pioneer VSX-1022-K won't turn on

[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

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 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 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.

[tibimakai]

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

At pin #37 of the CPU.
I haven't tried measuring at R319 while I reset the receiver. I will do that today.

[rievax_60]

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

I have measured it and it shows 3.11V for those couple of seconds.

Where did you measure this exactly?

[rievax_60]

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

I'm getting the same 0.002V increase, like at the CPU, when it's powered up.

It seems that STBY_RLY is getting to the FRONT ASSY. From there its supposed to leave from CP701 to the STBY ASSY.

[tibimakai]

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

I'm getting the same 0.002V increase, like at the CPU, when it's powered up.

[rievax_60]

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

Its on page 128 in the PDF.

[tibimakai]

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

Not sure where is that P128?
R319 is at pin #55.

[rievax_60]

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

Does the 3.11v get to R319 on P128?

[tibimakai]

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

Maybe some kind of protection is on, but how we can find out which one is tripping the shut down?
I will look again at the amp section.
The standy light shouldn't be on no matter what ? The CPU controls the standy also.
The standby should be on as I plug in the receiver. Even this basic function is controlled by the CPU?

[rievax_60]

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

I have measured it and it shows 3.11V for those couple of seconds.

You need to figure out why the relay isnt being turned on in those seconds.

[tibimakai]

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

I have measured it and it shows 3.11V for those couple of seconds.

[tibimakai]

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

Do you suspect the CPU to have an issue and that is why is not booting up the main transformer?
I have found a 822-k on Ebay which has some missing components for very cheap. In the SM, it is mentioned that the CPU boards in these three units are the same, only the part number is different.(VSX-42, VSX-1022k, VSX-822-k)

"7028071681030-IL, 7028071681050-IL and 7028071681010-IL are different in part number,
they consist of the same components."

[rievax_60]

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

The LED doesn't turn on at all, only when I do the reset. Even then only for a couple of seconds.
The receiver is NOT in standby mode.
Maybe I should measure then the voltage at the STBY_RLY.
I'm looking at the service manual at the diagnostic charts(page #32) and there it mentions that at the connector CN9501(12V for the HDMI board) is not there, then check the cable between the HDMI board and main board. If that checks out OK then check the main board. Why the main board and not the CPU?

I think the fault charts assume the receiver has turned on but doesnt actually say so.
If a rail originates from the large mains transformer, there cant be any voltage while the receiver is stuck in standby.
Yes, check STBY_RLY while the LED is on,

[tibimakai]

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

The LED doesn't turn on at all, only when I do the reset. Even then only for a couple of seconds.
The receiver is NOT in standby mode.
Maybe I should measure then the voltage at the STBY_RLY.
I'm looking at the service manual at the diagnostic charts(page #32) and there it mentions that at the connector CN9501(12V for the HDMI board) is not there, then check the cable between the HDMI board and main board. If that checks out OK then check the main board. Why the main board and not the CPU?

[rievax_60]

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

I see a reset pin at the CPU's #12 pin(looking at the block diagram), what that does and how can be done?

The reset pin should momentarily pulse low or be momentarily held low when the mains is first applied. Its only function is to cause the micro to start executing code cleanly.
Im still puzzled how the MCACC LED can light up without STBY_RLY pulsing high.

[tibimakai]

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

I see a reset pin at the CPU's #12 pin(looking at the block diagram), what that does and how can be done?

[rievax_60]

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

I have checked the schematic many times. For the MCACC LED to light up, STBY_RLY must be going high.
Can someone else confirm this also?