KM-4800w No Display

[Guest]

Please advise - Had customer's wide format in the shop for quality issues, rebuilt the developer with kit, replaced all three corona wires, tested great..... returned to customer - display panel lights, but no display. CMOS battery only had about .5v so replaced with new.. Power supply in control module seems to have failed (confirmed failure by 3rd party computer repair tech) - replaced with standard computer power supply (same power range). The only difference I found in the supply unit was the replacement has a test relay button where the original does not.... using test relay all fans spin up, however, primary unit still does not work when installed in machine (no display) and fans only spin up with test relay pushed...

[milan]

Re: KM-4800w No Display

Please advise - Had customer's wide format in the shop for quality issues, rebuilt the developer with kit, replaced all three corona wires, tested great..... returned to customer - display panel lights, but no display. CMOS battery only had about .5v so replaced with new.. Power supply in control module seems to have failed (confirmed failure by 3rd party computer repair tech) - replaced with standard computer power supply (same power range). The only difference I found in the supply unit was the replacement has a test relay button where the original does not.... using test relay all fans spin up, however, primary unit still does not work when installed in machine (no display) and fans only spin up with test relay pushed...

replace the hard disk.

[monstott2010]

Re: KM-4800w No Display

Replaced Power supply, fans operational, still no display
Replaced Motherboard, still no display, no post screens even when connected to external PC monitor

Print control system still has three components that have NOT been replaced
1) 305JG71030 CPU Celeron 440 ($859.74, contact customer service)
2) 305JG71050 HDD KM4800w US ($782.16, available)
3) 305JG71020 Memory Module ($497.12, available)

Per Tech Support, was recommended to try the HDD next, but was very unsure of that step being the correct one. My thought would be more likely to be the processor, given the fact the processor fan was non-operational, possibly overheating the CPU, but again, not positive that is the solution either. Need to get some additional input/advice before spending more money and time on parts that may or may not resolve the issue.

Is it possible to download the operating system to reinstall on the HDD or even install on a standard HDD? I looked on KDA but have not been able to find any files to do so....

[milan]

Re: KM-4800w No Display

Replaced Power supply, fans operational, still no display
Replaced Motherboard, still no display, no post screens even when connected to external PC monitor

Print control system still has three components that have NOT been replaced
1) 305JG71030 CPU Celeron 440 ($859.74, contact customer service)
2) 305JG71050 HDD KM4800w US ($782.16, available)
3) 305JG71020 Memory Module ($497.12, available)

Per Tech Support, was recommended to try the HDD next, but was very unsure of that step being the correct one. My thought would be more likely to be the processor, given the fact the processor fan was non-operational, possibly overheating the CPU, but again, not positive that is the solution either. Need to get some additional input/advice before spending more money and time on parts that may or may not resolve the issue.

Is it possible to download the operating system to reinstall on the HDD or even install on a standard HDD? I looked on KDA but have not been able to find any files to do so....

If your print controller fan is working that means that controller is working fine, the software is corrupted, we have this problem many times that we were installing the image file of the software. we don't have the original image file so, what we did was to make the image of the hard disk using the hard disk of the working machine and make the image using Acronis.

[monstott2010]

Re: KM-4800w No Display

Good thing I gave up drinking, this machine would have me drunk for a week.... Have now replaced the Power supply, the mother board AND the hard drive... STILL WILL NOT BOOT UP!! no display at all, testing in shop connected to a standard RGB cable on monitor... nothing.

[milan]

Re: KM-4800w No Display

Good thing I gave up drinking, this machine would have me drunk for a week.... Have now replaced the Power supply, the mother board AND the hard drive... STILL WILL NOT BOOT UP!! no display at all, testing in shop connected to a standard RGB cable on monitor... nothing.

That is a system software problem, if you removed the controller out of the machine and run like ordinary computer, short the power switch pin to run, you will see on the RGB monitor that the program start to load, at the end it will display the same view what you see on machine display. Is your hard drive having the system software installed?

[monstott2010]

Re: KM-4800w No Display

That is a system software problem, if you removed the controller out of the machine and run like ordinary computer, short the power switch pin to run, you will see on the RGB monitor that the program start to load, at the end it will display the same view what you see on machine display. Is your hard drive having the system software installed?

The HDD was supposed to come preloaded with the operating software, so assuming that is installed as it should be.... Can you tell me what pins to short to make it run? I have only had to run one independent from the machine once a few years back, don't remember having to short anything to make it work...

[subaro]

Re: KM-4800w No Display

replaced with standard computer power supply (same power range).


If you said the above and this is still true then jumper ground pin with the green pin. see the video below. Please note, you do this at your own risk. just trying to help here. also there are 20 pins and 24 pins power supply.


https://www.youtube.com/watch?v=2e_enZDKNAY


see the video below also

https://www.youtube.com/watch?v=IKoctd4ReW8


Also, why not look at the schematic for the machine. kyocera usually list the pinouts of the wires.

[monstott2010]

Re: KM-4800w No Display

replaced with standard computer power supply (same power range).


If you said the above and this is still true then jumper ground pin with the green pin. see the video below. Please note, you do this at your own risk. just trying to help here. also there are 20 pins and 24 pins power supply.


https://www.youtube.com/watch?v=2e_enZDKNAY


see the video below also

https://www.youtube.com/watch?v=IKoctd4ReW8


Also, why not look at the schematic for the machine. kyocera usually list the pinouts of the wires.

I had checked voltage and seemed to be ok, could get the fans to operate ok, but the system still does not seem to boot properly as still getting no video output. Was told to replace the HDD because of the software probably corrupt, not loading video drivers properly... so did that. Still not working. Thanks for the videos on the jumper. I thought maybe there was something else that needed to be done to get the system to boot up on it's own.. Only have a couple of these in our area, so not a constant hands on thing...

[subaro]

Re: KM-4800w No Display

I am saying up front i do not work on this machine, but looking at the thread and seeing you description of the problem, i would think it is more of something not sitting properly or some connector moved out of place. You replaced motherboard, hard drive and power supply already.
I downloaded the service manual for the 4850 and not sure how close this is to the 4800. but i would unplug the unnecessary connectors that is comming from the mother board and hook up the external monitor and power on and see. aslo check all the door switches to make sure they are working. unplug the internal monitor and scanner connection from the motherboard also.
There is also a pc control pcb that supplys voltage to the internal monitor, and other signals that i guess controls the motherboard. therefore with voltage going to the monitor you would get backlight, but data comes from the motherboard which something there is either shorting out, not connected or bad. there are two switches that goes to that pc control pwb, the fuser sw and another upper int sw, check if those are working when closed.

[monstott2010]

Re: KM-4800w No Display

I am saying up front i do not work on this machine, but looking at the thread and seeing you description of the problem, i would think it is more of something not sitting properly or some connector moved out of place. You replaced motherboard, hard drive and power supply already.
I downloaded the service manual for the 4850 and not sure how close this is to the 4800. but i would unplug the unnecessary connectors that is comming from the mother board and hook up the external monitor and power on and see. aslo check all the door switches to make sure they are working. unplug the internal monitor and scanner connection from the motherboard also.
There is also a pc control pcb that supplys voltage to the internal monitor, and other signals that i guess controls the motherboard. therefore with voltage going to the monitor you would get backlight, but data comes from the motherboard which something there is either shorting out, not connected or bad. there are two switches that goes to that pc control pwb, the fuser sw and another upper int sw, check if those are working when closed.

Thanks for the reply.. I currently have the print controller at the office, out of the machine. All of the MACHINE side limitations/possible issues are at this point voided... I have the controller connected to a standard PC monitor using a RGB connector. When powering on (plugging in) the controller, the power supply and PCU fan both power up and LEDs on the motherboard and PCI board all light normal... visually, the system would appear to be "on" and in a ready state, however, still not getting any display to the monitor. Monitor does detect if connection removed so assuming at least part of the connection is normal... seems so basic, not sure why this thing will not boot up

Just put the old motherboard back in, thinking since the HDD/Software was the suspect, old board should be ok - still no display -

[subaro]

Re: KM-4800w No Display

now getting an idea what's going on. In this case, you don't have any short, but either your pci card is bad or the memory chip. again i have never seen this, so i don't know the configuration here. remove the memory chip or chips and examine the slots where the memory is inserted carefully with a flashlight and a magnifier or any abnormal pins. you can also try pushing the chips a bit firm one way a bit firm while powering up and the other way. this is common on desktop pcs, not saying this is the solution here, but something to try. did you try another pci video card, even though the light is working. Only other thing here, is what is booting the system, the hard drive or is there a bios chip to start the system and then the hard drive kicks in with the rest of the software, somewhat like desktop computer. A move should not affect any bios chips, only the hard drive which has moving parts, unless it [ bios chip ]was erased by failed f/w update or something like that . what about the memory chips if they are replaceable , did you replace them.
Hope you get this working and let us know when you solve it.

[monstott2010]

Re: KM-4800w No Display

Thanks for all the help, FINALLY got the machine back up and running...

Was advised of a pin group (9 pins) on the motherboard that needed to be shorted across to force a reset - and it brought the video back up... jumped the 9 pins, powered on, got a post beep (that was not heard before) and the fans went to a lower speed. Turned the system back off, removed the jumper and pwr back on again, powered completely up and system came up to normal operating display. Attaching the picture sent to me, my board was slightly different, but was able to locate the correct pin set.

Reset Jumper - after power supply failure.jpg

[subaro]

Re: KM-4800w No Display

Nice you got it working. those type of jumper for resets brings me back to the days when repairing laptops had those issues. manufactures had special jumper points to reset motherboards ect. trade secrets, so you had to come to their repair depot.

[aspenhyd]

Re: KM-4800w No Display

Hi all, Reviving this old thread because we have the same machine and we think we have the same issue, just wondering if anyone else has had success with the method described by monstott2010?

Was advised of a pin group (9 pins) on the motherboard that needed to be shorted across to force a reset - and it brought the video back up... jumped the 9 pins, powered on, got a post beep (that was not heard before) and the fans went to a lower speed. Turned the system back off, removed the jumper and pwr back on again, powered completely up and system came up to normal operating display. Attaching the picture sent to me, my board was slightly different, but was able to locate the correct pin set.

Hoping to get some more thorough instructions if at all possible

thanks for any replies!