Need help with a VP300. Unresponsive, I’ve gone about as far as I know.

[UpriseSupply]

Hey guys, so here’s the rundown. Super thankful for any help or opinions offered!

Acquired a Roland versacamm VP300 that has been sitting for about a year. Previous owner said that he could not get the machine to power on and has basically given up on it. I recently rebuilt my Ricoh DTG printer so felt fairly confident that i could tackle this.. Since picking it up, I purchased a new panel board since i read that the sub power button was know to fail. Swapped that out but will not power up.

Ive read just about every thread i can find on here but no one seems to have the exact scenario that im dealing with. So here is the rundown of what ive messed with so far.

When i turn the power switch on the back on, i see
- Green Led on the Carriage illuminates
- Green LED on Main board (D1) illuminates (shown in photo)
- LAN Port Flashes
- The LCD Screen does nothing, and pressing / holding the power button also does nothing.

Other than that, nothing else happens.
**Note** I did notice that the D1 LED stays constantly lit on some turn power cycles, but then other times just flashes and shuts off.

Heres what ive "tested" so far.
- Checked all print head ribbon cables on both sides since i read that was a common issue.
- Checked panel board ribbon cables on both sides
- Also used a multimeter to check voltage on thru the ribbon cable to the panel board and had power in there, and assortment of 41v and 5v inputs.
- Checked the 3 Fuses on main board as well as the 2 fuses on the power board, all fine.
- Checked voltage from the 3 power wires leading from the power supply board to the Servo Board. (pictured)
- All show 41V
- Checked power from servo board to main board, also shows 41v.


Hopefully there is enough information here to help point me in the right direction or to let me know that im an idiot and missed a crutial step lol.

Thanks in advance!

 

[damonCA21]

Replacing the screen panel board would be the next step. They do fail with age, even if they are getting a voltage input;. From what you have done so far the power supplies to the printer all seem fine. Even if you get a problem with the main board or servo board, the panel will still come on and give you an error code.
When the printer powers on, it will boot up, but won't go any further unless it gets power from the main control panel button.
I have used tested OEM control panel boards in stock if you need one. Generally they aren't repairable as the main chip on the board fails and you can't get replacement ones.

 

[UpriseSupply]

So the panel board was actually the first thing I replaced like I said I had read on here that they are prone to failure. I did that before I even got into testing voltages and whatnot. I’m sure it’s completely possible that the new panel board could also be faulty, but I’d sure hope not.

And just to recap, Currently when I turn it on nothing really happens besides those leds turning on. No initialization or boot sequence at least nothing that’s noticeable. I’m assuming that all happens once the sub power button “wakes the machine up”

I did check the sub power button (unplugged form machine) for continuity when depressed to make sure that it was actually doing something when pressed, and I can see that the switch is opening and closing.

Is there anything else I would be able to check on the board to make sure that either of them are not defective?

 

[damonCA21]

Was the panel board sold as new? If so it is most likely one of the chinese copies, and these often dont work properly ( you can normally tell by comparing the print on them to an OEM board ).
It is possible the mainboard has failed but other than checking components on it for shorts, then it isn't really possible to diagnose.
It won't be anything to do with the head cables or mainboard fuses as the printer will still power up fine if these are faulty.
The sub power button isn't a direct connection to the mainboard, it goes via the chip on the panel board so even if the switch is physically working, if the panel board is bad it won't send the on signal.
The printer is booting otherwise you wouldn't get the network connector lights coming on.
Really you are getting to the point now of replacing boards and seeing if it makes it work. The panel board is the cheapest, but then you are looking at replacing the servo board and main board as none of them are really repairable as such

 

[UpriseSupply]

Yeah so the board I have was sold as new. But it’s certainly possible it’s a Chinese knockoff. Everything on it looks the identical minus there is no like model code in the top left corner. I just assumed the original was older and maybe some things have changed since then.

I guess I’ll have to try another panel board and hope for the best.

Glad to hear my head was in the right direction and that the other things in the printer seem to be turning on as they should.

 

[damonCA21]

If it came from digiprint or china or similar then is definitely a knock off. You can't get new boards from Roland anymore. If it isn't the panel board and all cables are ok then my next guess would the mainboard has partially failed. These are getting quite hard to get working ones now though

 

[UpriseSupply]

I purchased from eBay. I just submitted a return for it so hoping that goes smoothly and I can purchase another board and give it a go sooner than later.

 

[damonCA21]

You are often better off with a tested used board as you know it has definitely been working. Sellers who sell new ( knock off ) ones don't test them so don't know if they work or not.
If you do need one let me know and I can sort it out as all the used parts I sell are tested before the printers are stripped