Yamaha DRX-730 won't start

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  • jm1234
    9V relay temperature 40C
    by jm1234
    Hi, I'm seeing one 9V relay having temperature 40C on its 9V (primary) side. Does that seem right? I switched 2 relays on that board and the temperature was the same (on the same position), so I'm sure it's not a faulty relay. I measured voltage on that relay and it was 9.5V DC, so that looks good. I don't see any other relay on that board having that kind of temperature and they have 9V on them too.
    I thought maybe the transistor that is switching this relay keeps switching on/off, so I also checked for AC and there was almost none: 0.3V using mV range. No steady frequency was shown, but...
    05-09-2024, 03:03 AM
  • edugimeno
    Biomass Boiler not driving cleaner motor relay. ENERTRES BIOMASA BI-650
    by edugimeno
    Hi everyone!
    I have this board that suddenly stopped supplying power to an output that drives an interchanger cleaner motor.
    I checked while the board was in place with all wires attached and there's no AC voltage on the corresponding plug X5
    This X5 is driven by fuse F8 (tested OK) which comes from the second orange relay
    To make sure there are no charcoaled contacts inside the relay, I got a 24VDC power supply and got it ready to manually power up the coil side of these relays.
    I respected the polarity, positive to cathode of protecting diode
    So provided all...
    04-18-2024, 01:15 PM
  • sam_sam_sam
    Mitsubishi CNC switching power supply board dead / relay board bad diode failure
    by sam_sam_sam
    I was working on this CNC machine today found no keyboard functioning no control relay powering on
    The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board

    Found shorted diodes on main controller relays there are 3 of them that...
    01-07-2023, 05:43 PM
  • sanalelevenstar
    Yamaha RX-V485 Wn9711 Update
    by sanalelevenstar
    Help Needed: Yamaha RX-V485 Network Issue After Firmware Update (WN9711 Error)

    Hi everyone,

    I'm facing an issue with my Yamaha RX-V485 receiver. During a firmware update, the process failed, and now the USB, Bluetooth, and network functionalities are not working. Occasionally, the receiver displays the error code WN9711.

    I came across Yamaha Technical Bulletin No. 0103, which describes a similar issue for models like the RX-V4A, RX-V6A, and RX-A2A. According to the bulletin, the issue can be resolved by shorting soldering points (e.g., J260 for RX-V4A or...
    12-04-2024, 04:32 AM
  • AlexVG
    YAMAHA CLP-550 without of sound
    by AlexVG
    Hi.
    I have an old YAMAHA CLP-550 without sound. (Some times I can get some kind of noise or distorted sound)
    I have replaced all green marked elements, but it gave me nothing.
    The IC12 chip LC9116A-105 (red marked) remains under suspicion yet.

    But it is custom YAMAHA's chip, and I can't find any information about it.
    Maybe somebody came across with the same issue?
    Any information will be very useful. I will be very appreciated.
    Thank you....
    06-08-2025, 09:29 AM
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