Bizhub C35 Output Tray Full error

I'm not sure how many Konica Minolta Bizhub C35 are left around the place but I came across an old one that wouldn't print because it had an error that the output tray was full. The problem was that there was nothing in the output tray.
A quick look on the floor and I found the output tray sensor arm. 

Someone had been rough getting their printing out of the tray and broke the sensor arm at the front of the machine. Without the arm the sensor flag does not sit in the correct position and the machine constantly thinks that the tray is full and prevents printing.

The correct thing to do is to find a new sensor arm, remove left side, rear and MFP board covers, remove the ADF and scanner bed and control panel, remove the output tray, take out the cooling ducts and fans, fuser and then remove the exit assembley before disassembling the exit assembly and replacing the sensor arm. But what if you don't have another senor arm?
Once you have taken off the output tray the Output Tray Full Sensor is visible behind the control panel area and can be unplugged. If the sensor is unplugged the machine thinks the tray is empty and will allow printing.
If you are really lazy you could just remove the control panel and the 3 yellow wires for the senor are visible in the wire harness underneath. You could cut them without disassembling anything else. But that would be a really lazy way to do it.

Firmware update stopped connection to server

I hate when you think you have fixed a machine but realise that you have created a seperate major problem.
I had a Konica Bizhub C308 that was reportedly skewing and blurring scans.Skewing scans is a common problem and easily fixed by realigning the Document Feeder. While I was doing that I had a quick look at the firmware and saw that it was running version G00-54. That is really old and probably explains the blurred scans. G00-54 was notorious for scan quality problems so I loaded the latest firmware I had which is GC2-R9. No more scanning issues.

So I am about to leave, feeling good about a job well done, when the secretary says "Um, I can't print".

So I am wondering how updating firmware now prevents printing. I hopped on a computer and had a look at the print queue and see that it is on a remote server, is full of jobs and is reporting that the printer is in error. As a quick test I installed a new printer on the local computer and am able to print ok. Next step is to call the IT support for the remote server and let them look at the server. After they do the same tests as me they determine that it is a server side issue and they will fix it. I am still highly suspicious of the firmware update. So I call around the other techs to see if they have had this issue. The finale guy I called remembered an E-mail from a couple of years ago alerting to a problem with an old firmware. Auto Selective IP Address Filtering is turned on by default. 

So while the IT guys are messing around I have a look at the IP settings and see that the IP filtering has been turned on. This means that the machine is filtering out traffic from the remote server but still accepting traffic from the local network. I turned the setting off and the machine starts printing.

I let the IT guys take the credit for fixing the problem rather than admitting that I had caused it.