LaserJet4100 TN additional paper tray

[holytech]

Hi:
In adding the additional paper tray at the bottom of the 4100, I configured it in the menu on the printer and see the tray on the profile on the network. There is paper in the tray, yet it continually gives an error message that I need to load paper. I set the upper tray for letter and the lower tray for Legal. m I switched the trays and reconfigured the lower one for letter. When I tried to print on the letter tray again I got the same error message that I needed to load paper. Looks like the printer cannot determine if there is paper in that lower tray. How do I trouble shoot this? Is there a contact that might need cleaning or a part that goes? I doubt this is a roller issue, but I could replace those. Suggestions would be helped. :confused:
Thanks

[redcow]

Print a config page and check the "paper trays and options".
Does tray 3 show up. If it does, is it configured for the correct paper type and size?
You may have gotten a bad paper tray assembly

[holytech]

Thanks for the response.
I did check and discovered that this printer doesn't even see the third tray. I had mistakenly thought I could ask it to see the bottom tray as # 1 - Duh.
The printer is just not "seeing" the third tray. Oh well. That I can work on. But until it manages to see it, will just be a neat little stand for it to sit on.
Does anyone have any idea how I might get this printer to see this extra tray? Any suggestions would be appreciated.

[MichaelTech]

The PCA for the lower base may be bad. the connector from the bottom of the printer to the lower base may be bent, or bad.
Check the connectors pins.

[holytech]

Checked and cleaned the pins. They seem to be all there. Did the same with phone jacks that are copper and corrode over time. No effect here though. I suspect that this tray is just baked. I'll just keep tinkering. Thanks

[cs_steve]

One fairly common problem is, as MichaelTech said, the PCA fails on this model ... this is a small circuit board on the right hand side of the inside of the OLC base ... there is a small plastic panel that covers this PCA, unhook that panel and from there its an easy swap ...

[holytech]

Found the circuit board. I'll seek a replacement on the site.Thanks for the hint.