Bizhub c308, no power...

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  • Elmojo
    Trusted Tech

    Site Contributor
    100+ Posts
    • Oct 2020
    • 167
    #1

    [Dead] Bizhub c308, no power...

    So our beloved K-M Bizhub c308 (which you kind folks have helped with a couple times in the past), appears to be super dead this morning. Our office manager has done all the basic troubleshooting, such as checking the breaker in the panel, trying a different wall outlet, making sure the main and sub power switches are on, unplugging the machine for 30mins and trying again, etc... It will not power on at all.
    I'm wondering, does this machine have an internal breaker or fuse that may need to be reset or replaced? Barring that, is there a separate power supply unit or board that could be replaced, or is it built into the main board?
    We really like this machine, and would prefer not to replace it if possible, based on comments from experienced techs regarding the relatively inferior quality of newer units.

    Just a a note, I'm not on-site, but I may be in the next few days, depending on what needs to be done to it. I'm the IT manager and all around "equipment guy" for our company, so if anything gets fixed, it's me. I know most of you know how that feels.

    Any assistance greatly appreciated, as always. This community is an amazing resource!!
    Tags: None
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22922
      #2
      There is a power filter board which has a fuse, but only rarely is it that easy. When you flip the switches ON, 5vdc is generated at the power supply to wake up the PRCB. If the PRCB boots up properly, it sends a signal to the power supply to generate all the other voltages. If you know how to take voltages from the power supply board and you have the manual, you can monitor the wake-up 5vdc when the switches are flipped on. If it's not there, the cause is the power supply. If that wake-up 5vdc is present, but the rest of the voltages are not present, then either that 5vdc was lost by a damaged wire harness, the PRCB did not boot up correctly, the signal was lost by a broken wire on the way back to the power supply, or the power supply cannot generate the rest of those voltages (50/50: PRCB/power supply). Nice and simple, yes? Can you pin-out the connectors on the power supply? =^..^=
      If you'd like a serious answer to your request:
      1) demonstrate that you've read the manual
      2) demonstrate that you made some attempt to fix it.
      3) if you're going to ask about jams include the jam code.
      4) if you're going to ask about an error code include the error code.
      5) You are the person onsite. Only you can make observations.

      blackcat: Master Of The Obvious =^..^=

        Comment

        • Elmojo
          Trusted Tech

          Site Contributor
          100+ Posts
          • Oct 2020
          • 167
          #3
          Nice!
          Well, I do have the Svc Manual, but the way this thing is laid out, I often have trouble finding the section I need. Can you give any hints on what section I need to look in? I see a wiring diagram, but I've never been great at reading those. Is there an actual illustration or procedure outlined in the manual that tells me what points to probe for the voltages?
          I have a decent DMM and sort of know how to use it, so I'm willing to give it a try.
          I'd love to check the fuse on the filter board, just to rule that out. They have sort of unstable power there at my office, so I wouldn't be surprised if it popped the fuse. I would, however, be very surprised if a wiring harness suddenly got 'damaged', since no one was even in the building to touch the machine, and we don't have mice, to my knowledge. lol
          Assuming it's a bad power supply, how big of a job is that to replace? Any tips on identifying the part number for that? For example, does this appear correct? I realize it's a Chinese site, I'm just trying to ID what sort of component I'm looking for.
          By the way, what's the PRCB? Is that the main board or something else?

            Comment

            • Synthohol
              Certified Konica Expert

              Site Contributor
              5,000+ Posts
              • Mar 2016
              • 5735
              #4
              PM'd you a proper parts manual
              We know a thing or two because we've seen a thing or two.
              The medication helps though...
                😀 1

                Comment

                • Elmojo
                  Trusted Tech

                  Site Contributor
                  100+ Posts
                  • Oct 2020
                  • 167
                  #5
                  Originally posted by Synthohol
                  PM'd you a proper parts manual
                  You Sir, are a rockstar! This is far easier to follow than the one I had.
                  Still not sure if I know what to do, but at least I'm building the tools to do it with... lol

                    Comment

                    • tsbservice
                      Field tech

                      Site Contributor
                      5,000+ Posts
                      • May 2007
                      • 7909
                      #6
                      Hey BC it's 8 series so no PRCB Sir.
                      Making a bit easier for troubleshooting... but wait a moment. No it's not easy.
                      Elmojo PS is under left side plastic cover and metal shield easy to replace if you have another from working machine. The tricky part is I never heard of dead C308 or such model. You may need to watch lcd panel for any activity, remove all accessories like DF, finisher, etc and start machine.
                      Try to boot with firmware and so on.
                      I believe you should visit machine and I would made everything to help you too.
                      A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
                      Blessed are they who can laugh at themselves, for they shall never cease to be amused.

                        Comment

                        • tsbservice
                          Field tech

                          Site Contributor
                          5,000+ Posts
                          • May 2007
                          • 7909
                          #7
                          Also recently a tech here mentioned that PS for C224e and C250i are basically the same so it can help wider troubleshooting
                          A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
                          Blessed are they who can laugh at themselves, for they shall never cease to be amused.

                            Comment

                            • Elmojo
                              Trusted Tech

                              Site Contributor
                              100+ Posts
                              • Oct 2020
                              • 167
                              #8
                              tsbservice, that's good info, thanks! I did see in the Svc Manual that the DC PSU module appears to be fairly easy to replace. Unfortunately, I don't have a used one from another machine to swap over to try. I have another client with an old c250, but I doubt they'd let me tear their machine apart. lol
                              I plan to go to the site over the next couple days to put my eyes on it, and try to test for voltages, but I'd sure love to have some more specific directions on where to test and for what, if you experienced folks would be willing to take the time to direct me.

                                Comment

                                • copyTcat
                                  Senior Technician

                                  50+ Posts
                                  • Apr 2015
                                  • 58
                                  #9
                                  You like this machine? Call a technician for KM instead of trying to do your own repair and screwing something
                                    👎 1

                                    Comment

                                    • copyman
                                      Owner / Technician

                                      Site Contributor
                                      2,500+ Posts
                                      • Sep 2005
                                      • 4519
                                      #10
                                      No need to call a tech for this, not that hard to replace power supply. If no fans, lights or anything else pwr supply is most likely bad. Check the voltage going into power supply and voltages out. If bad you can send to a company like Hytech dealer services for repair or just buy a repaired board from them.
                                      Is machine on a good surge protector with noise filter?

                                        Comment

                                        • blackcat4866
                                          Master Of The Obvious

                                          Site Contributor
                                          10,000+ Posts
                                          • Jul 2007
                                          • 22922
                                          #11
                                          Maybe this will help:
                                          This model uses an MFPB (not PRCB).

                                          DCPS troubleshooting.jpg
                                          Attached Files
                                          If you'd like a serious answer to your request:
                                          1) demonstrate that you've read the manual
                                          2) demonstrate that you made some attempt to fix it.
                                          3) if you're going to ask about jams include the jam code.
                                          4) if you're going to ask about an error code include the error code.
                                          5) You are the person onsite. Only you can make observations.

                                          blackcat: Master Of The Obvious =^..^=
                                            😀 1

                                            Comment

                                            • Elmojo
                                              Trusted Tech

                                              Site Contributor
                                              100+ Posts
                                              • Oct 2020
                                              • 167
                                              #12
                                              blackcat4866 oh man, that page is GOLD. Thanks so much!
                                              So you guys won't believe this, but our office manager called me this morning and said that when she came into work today, the machine was on, and had printed a job from yesterday.
                                              I'm not sure what to make of that. Does that sound like some intermittent failure that could still be the DCPU on it's last leg or something? I've had computers exhibit similar behavior before when their power supply was about to kick the bucket.
                                              With the machine 'working' at the moment, I don't really know what to test...
                                              Is there anything I can do, until it decides to drop dead again?

                                                Comment

                                                • blackcat4866
                                                  Master Of The Obvious

                                                  Site Contributor
                                                  10,000+ Posts
                                                  • Jul 2007
                                                  • 22922
                                                  #13
                                                  I've seen it before too. On the Canon fax machines, I would warn the customer: I have to unplug the machine to clean it. There is a 50/50 change it might not come back ON. do you still want me to clean it?

                                                  You'll have to wait for it to malfunction again before you diagnose any further. =^..^=
                                                  If you'd like a serious answer to your request:
                                                  1) demonstrate that you've read the manual
                                                  2) demonstrate that you made some attempt to fix it.
                                                  3) if you're going to ask about jams include the jam code.
                                                  4) if you're going to ask about an error code include the error code.
                                                  5) You are the person onsite. Only you can make observations.

                                                  blackcat: Master Of The Obvious =^..^=

                                                    Comment

                                                    • copyman
                                                      Owner / Technician

                                                      Site Contributor
                                                      2,500+ Posts
                                                      • Sep 2005
                                                      • 4519
                                                      #14
                                                      Disable sleep in Admin mode. May have to go into service mode first and "enable" sleep to be turned off.

                                                      Update firmware.
                                                        👍 1

                                                        Comment

                                                        • Elmojo
                                                          Trusted Tech

                                                          Site Contributor
                                                          100+ Posts
                                                          • Oct 2020
                                                          • 167
                                                          #15
                                                          Originally posted by copyman
                                                          Disable sleep in Admin mode. May have to go into service mode first and "enable" sleep to be turned off.

                                                          Update firmware.
                                                          Is this something that would suddenly change on its own after many years? Would sleep mode kill the machine dead?
                                                          Oh, and most important, is this a change I can make remotely (I have VPN access to the network) or do I physically have to stand at the machine?

                                                            Comment

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