Roland F140R piano won't start up

[Arseny]

Hello! I have the same problem with this piano. Could somebody upload full service manual?

[Nyqusit5]

Ok, the piano is repaired!
I identified a faulty fuse/resistor (R131) stopping the 3.3V from reaching the rest of the circuit. This resistor is a small SMD in the middle of a very densely populated board and I could not have found it without the schematic.
FIY, the F140R seems to be very sensitive to input power as the user of this piano employed a replacement psu putting out 12.4V instead of the 12V of the original PSB-7U.


I want to thank Nosaj and Dmeek again for their decisive help!

[Nyqusit5]

Thank you VERY much Dmeek.
There's a lot to check for me tomorrow, so I can't say if it will be enough yet.
Anyway, again, a big thank you!

[dmeek]

They must have got a cease and desist letter from Roland, Several years ago all the Roland files disappeared. Fortunately I snagged it but unfortunately it's too large to post here - 19M

Maybe these are enough?

[nosaj]

Ok it is missing now but send your email as for some reason I can't upload it here. you can PM.
nosaj

[Nyqusit5]

That would be just awesome...
But I just cannot find it whatever the key words used for the search and the link does not work... I don't think it is on Elektrotanya unless you can point it to me?

[Jazz P Bass]

Nice!

[dmeek]

The service manual was uploaded to Elektrotanya today.

https://elektrotanya.com/digital_pia.../download.html

[Pixel]

Did you directly contact Roland to ask if they could provide or sell the service manual?

Try contacting them through a few social media channels...companies pay way too much attention to social media and you might get lucky.

[Nyqusit5]

Still looking for the schematic.
The power distribution and start-up part would be enough!

[Nyqusit5]

Yes, but they won't...

[Enzo]

Did you directly contact Roland to ask if they could provide or sell the service manual?

[Nyqusit5]

Still looking for this schematic... At least, the power distribution and start-up part....!

[Nyqusit5]

Yes, that's a good point. I already had a look around and couldn't find one that was even close. The F140R is fairly recent and I couldn't find a digital piano or synth that used the same type of circuit and that had an accessible service manual (the F701 seems to be a candidate for exemple).

[Jazz P Bass]

Maybe there is a circuit that is something close that they have used in a previous model.
https://www.synthxl.com/manufacturers/roland/