Help Yamaha RX-V473 (Internal Error) - Page 1
Forum section: electronics / repair

author: Jose1955
author_rank: Newbie
timestamp: October 06, 2025, 06:16:47 pm
content: Hello,I've been trying to repair this device for a while.Initially, the problem I was having was...The buttons on the front of the device weren't working; only the volume button worked. Everything could be controlled via the remote control.Everything was working correctly, except that "Internal Error" appeared on the screen. Photo 1When I pressed any key on the remote, it performed its function and appeared on the display, but the "Internal Error" error immediately reappeared, but the device worked correctly with all its functions.One day, the sound stopped working, and I dug deeper into it to see if I could fix it, as it would be a shame to part with it.Since the buttons on the front don't work when it's locked, I can't enter configuration mode.I have noticed that pressing (Tone control) + (Info) + (on-off)(NO PROTECT) appears on the display in Photo 2.Then the image in Photo 3 appears on the display.From what I gather, the device model should appear, but it doesn't.I tried updating the software by downloading the latest version from Yamaha.By holding down the on-off button and with the USB connected and the file inside,the software update and verification begins, following all steps in Photos 4 and 5up to S5-1: VERIFYINGFrom here, the "ERROR 0010" screen appears in Photo 6.I checked the voltages on the digital board, both inputs and outputs, and I don't see anything abnormal.Could you give me any ideas for further investigation?Thank you very much in advance.

author: pqass
author_rank: Super Contributor
timestamp: October 06, 2025, 07:40:45 pm
content: I found theservice manual here(with schematics). Unfortunately, it's partially in Japanese. There's no mention of the error messages you've seen.The keys are read by MCU ADC on two resistor ladders (see page 96). Maybe there's a bad connection (connector CB402)?

author: MathWizard
author_rank: Super Contributor
timestamp: October 06, 2025, 11:20:18 pm
content: Do you have an oscilloscope by any chance ? It would be nice to see what signals are going to or from the buttons, and other places from the MCU.What functions or modes do you normally use ? If the main MCU was failing, and you can live with less functions/modes, a lot of stuff could probably be hardwired or bypassed (if you just want to keep it running rather than buy new stuff)IDK this AVR model, but for example my AVR has a failing MCU, and I had trouble changing inputs, and setting volume. So I made a little volume control board with pots, to bypass the Volume IC, and I also hardwired the EXT INPUT to make it the default, and bypass the input Switch IC for that.Someday I need to finish programming another MCU, so I can still use the digital VOL IC and INput SW IC's

author: Jose1955
author_rank: Newbie
timestamp: October 09, 2025, 12:09:11 pm
content: Hello, good morning again.After some research on the device,* I've resolved the issue where the front keys aren't working.The problem was that the KEY 2 signal wasn't reaching microprocessor IC 21 (pin 24) from the keypad. There was an interruption at some point in the digital board's double-sided circuit, and a through-hole on the printed circuit board was also faulty (this was solved by making a jumper as seen in (Photos 7 and*The problem that persists, as I mentioned earlier, is that the display shows "Internal Error" (Photo 1).Going into configuration, I noticed that parameter C2-1 shows the RX-V573 model (Photo 9) when it should show "RX-V473."Modifying it from the corresponding menu and turning it off with the on/off switch, the internal error problem disappeared when turning it back on.After checking parameter C2-1, it now shows the correct RX-V473 model and the display correctly displays all its functions.Regarding the display, everything is fine, but we don't have audio coming from the speaker outputs, as I had previously mentioned. I mentioned at the beginning of the post.Now, if we disconnect the device from the power plug and reconnect it, the previous problem (Internal Error) reappears, and the V573 model appears in C2-1.It seems that the data we modified earlier hasn't been saved.I'll point out other anomalies I've noticed that aren't correct in case they might be of interest.Parameters C1-5 (Photo 10) indicate a communication error between IC21 (Microprocessor) and IC41 (DSP), (this is likely where the sound problem comes from).I've checked several signals from these circuits with the oscilloscope.Pins 100, 101, and 102 of the Microprocessor show activity when pressing keys; pins 126 and 127 of the IC41 DSP also show activity. But I haven't reached any conclusions. Some pins are active, while others aren't. I don't know exactly where I should look to see if there's communication between the two. The IC is correct.Parameter C1-6 (Picture 11) indicates an error in the EEPROM IC22. By tapping on pins 5 and 6, activity is observed when pressing the keys on the front panel.Parameters• S2-3• S4-1• S4-2• S4-3• S4-4Are also incorrect.I tried updating the software via USB with the latest version from Yamaha. When I have it correctly configured as RX-V473, it completes the entire process correctly up to the S5-1 Verifying sequence (Picture 5), and then Error 0010 appears (Picture 6), so I think it hasn't been updated correctly.I'm stuck, and I hate giving up.Sorry for the long post, but it's stuck in my throat like a thorn in my side.