Duplexer jams only when page is blank

[DavePL]

We have an HP Laserjet 4Si. It prints double sided without a problem as long as there is print on both sides of the page. However if we send a one page document, it always gets stuck somewhere in the paper path, usually near the duplexer. We thought this was a hardware problem, maybe with the rollers, but why would it work when there is print on both sides? Could that be the printer driver?
Any comments would be much appreciated.

 

[netmanrick]

Print out the config at the printer.What is the setting of
the Mopier(duplexer) ?
Now check the printer config on the pc.
What is the setting for Mopier(duplexer) ?
Single sided printed should not have the duplexer enabled.
The duplexer should only enable when duplex printing is occurring.

Rick Harris
SC Dept of Motor Vehicles
Network Operations

 

[DavePL]

Looking at the "test menu" printouts:
The self test page shows:
"installed options: duplex unit"
The P.S. config. page shows: "Duplex: Off".
(We manually turned off duplex, but it still prints duplex if the printer settings in MS Word, etc, say "double sided".)
That's pretty much all I could find on the test menu.

 

[netmanrick]

Does the problem crop ur if paper is fed from any installed
tray ?

Rick Harris
SC Dept of Motor Vehicles
Network Operations

 

[DavePL]

Actually today the printer seems to working without any problems. This morning there was a paper jam, and they reversed the paper in the tray, that seemed to fix it! We will keep an eye on it.
Interestingly, the duplexer is configured to "duplexer =off", on the printer, but MS Word over-rides that setting if you click to enable double sided.
There is a second paper tray (legal size) underneath the main one. We haven't tried using it, but that may be an option, especially if we can re-configure it for standard size paper.