Yamaha RX-V863

[ga70gto]

Re: Yamaha RX-V863

Clutchbox......one of the first things I did was to resolder many of the connections hoping there would be a cold solder joint, no luck.........thanks for the idea though.

[budm]

Re: Yamaha RX-V863

I believe its a Rx-v863U as you had mentioned. the rear lists 120v and the front panel controls seem to match up with the front panel in the manual. The rear of the unit only lists RX-V863, no "U" or any other suffix.

There is NO audible click from the relay and as you noticed there are many components listed on the schematic that aren't present on the board.

So the question is why isn't the relay being commanded to close? As I mentioned before I did replace the relay on the original board because on vehicles I've heard relays click but that didn't necessarily mean voltage was transferred through the contacts.

Q2510 is the relay driver has to get about 5V on the connector W2501 'PRY' pin which is the power relay on command signal from the processor to turn on the relay when the power switch is activated, see the PDF I had attached earlier.

[ga70gto]

Re: Yamaha RX-V863

It appears Q2510 would have been located on the bottom of the board and would have been surface mount. I checked both boards, found the Q2510 label but there is no component in that spot. The manual describes it as a digital transistor. You can see the label on the picture I attached of the bottom of the board.

Thanks again Bud for your continued help.

[budm]

Re: Yamaha RX-V863

Sorry, I screwed up, it is Q2502 TO-18 for driving the relay RY251. Q2510 is not used in your board version.

[ga70gto]

Re: Yamaha RX-V863

Thanks Bud. Even though I say it time and again I really do appreciate the help and guidance. Sometimes on cars what appears to be a complex repair can be a simple repair if someone has been there before seen it and done it. I was hoping maybe someone had seen this before on a similar unit. On cars we sometimes do a "shotgun" repair where we throw several items at a problem at one time to try and repair a problem. I think on this board I'll replace both transistors Q2502 and Q2503 along with C2504 and C2506 capacitors and D2514 diode bridge and see what happens.

Pete

[budm]

Re: Yamaha RX-V863

I have a feeling you are not getting the command ON signal (PRY) pin to turn on the transistor, I would check that first.
This unit is also a little confusing due to the boards can be stuffed with parts in so many way for each country, so not all the parts are on the boards.

[ga70gto]

Re: Yamaha RX-V863

Hey again Bud. Your question about the transistor not being turned on made me wonder about how does the PRY (power relay?) wire get power since the power first must go through the Function 3 board (pg 113). as we already know the diagram shows numerous components that my board doesn't use such as the ic's but it does use D2514 (bridge rectifier). The diagram clearly shows the leads of the board mounted transformer going directly to D2514 with 4.8 (volts) in red. I only have 4.2 volts on the AC scale. it further shows an output of 12.5 (volts), I only have 7.2 volts on the DC scale, that's me 'assuming" that once the voltage passes through the rectifier it becomes DC. This 12.5 volts not only goes to the onboard relay but to pin S10 of connector W2501 which then goes to connector CB33 of the Digital 2/5 page. So, this is an output voltage of the function 3 board? What if 7 volts on this line isn't enough to operate whatever it is that in turn goes to the PRY wire? I've been using the chassis as ground for these tests because pin "MG" of connector W2501is labeled "E" on the Digital board which I take to mean "earth" or ground and I have excellent continuity to ground on this pin (less than 1 ohm). So one of my questions is how did they arrive at 12.5 (volts) as the output of D2514 (bridge rectifier) and of course why do I have only 7 volts?
Thanks again, Pete