Crown CH4 Crazy Relay

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • tvfixer007
    Senior Member
    • Feb 2015
    • 86
    • United States
    #1

    Crown CH4 Crazy Relay

    Having trouble with my Crown Ch4 it first went into fault mode on both channels. I found a service manual and used test points to further figure out the issue. I forgot to discharge the power supply when I removed the Flyback PWA board Then I forgot to put the Flyback PWA board back in before I powered it back up

    So now the relay sounds like a machine gun when I try to power it up.
    Tags: None
    • madan1
      Badcaps Veteran
      • Nov 2016
      • 682
      • Bulgaria
      #2
      Re: Crown CH4 Crazy Relay

      I had similar relay behavior on an onkyo receiver - it turned out that it just needed the back plate for good ground on all boards.
      So check if all your board/cable connections are fine. Also, upload the service manual ( if you have it ).

        Comment

        • tvfixer007
          Senior Member
          • Feb 2015
          • 86
          • United States
          #3
          Re: Crown CH4 Crazy Relay

          Thanks for the quick reply. I'll try that, and I have a service manual for CE4000 which is identical to the CH4 on the inside.
          Attached Files

            Comment

            • madan1
              Badcaps Veteran
              • Nov 2016
              • 682
              • Bulgaria
              #4
              Re: Crown CH4 Crazy Relay

              Better service manual for CE4000
              Attached Files

                Comment

                • tvfixer007
                  Senior Member
                  • Feb 2015
                  • 86
                  • United States
                  #5
                  Re: Crown CH4 Crazy Relay

                  I bolted back in the board, and made sure ground was good. Still does it, but this time I noticed a ticking/clicking sound coming from somewhere on the flyback PWA board.
                  Attached Files

                    Comment

                    Previous template Next

                    Related Topics

                    Collapse
                    • 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
                    • tony359
                      Faulty CRT AKF12/Philips CM8500: bad flyback?
                      by tony359
                      Hi all,

                      I have a CRT (Acorn AKF12, based on the 240V version of the Philips CM8500) which has stopped working. It's making a high pitched noise but not too high. I know this is symptom of a faulty flyback.

                      What happens when a flyback fails? I see that the main voltages out of the PSU are not reaching rated values, as if there is a short.
                      There are supposed to be 125V/26.5V/15.5V outputs but I am reading something like 48V, 10V and 8V. If I unplug the PSU from the rest of the PCB, I can measure the expected values.

                      Can it be a short somewhere...
                      08-22-2023, 04:39 PM
                    • fadi90
                      PILZ PNOZ X4 Safety Relay
                      by fadi90
                      Hi everyone,

                      I'm working on repairing a Pilz PNOZ X4 safety relay module. When I opened it up, I found some of the connector pins detached from their pads. I replaced the connector with individual wires, but the issue remains.

                      The module is set to dual-channel mode with manual start. In this mode:
                      • Y36-Y37 and Y1-Y2 are bridged.
                      • 24VDC is applied across A1-A2.
                      • It monitors two emergency circuits (S11→S12 and S11→S52).
                      • When both are closed (24V present on S12 and S52) and the start button is pressed (S33 connected to S34), the NO contacts (13-14, 23-24, 33-34)
                      ...
                      X4 - Google Drive
                      https://drive.google.com
                      06-07-2025, 01:21 AM
                    • Loading...
                    • No more items.
                    Working...