HP Pro 4300 C9H70UT C9H70UT#ABA manual Tray 2, 500-, 1,500-sheet feeder media size detection

Tray 2, 500-, 1,500-sheet feeder media size detection

Media size in the cassette are detected by three switches. The switches are active after the cassette is placed in the tray 2 feeder. (this also applies to the optional 500- and 1,500-sheet feeder). The DC controller PCA microprocessor detects the size and presence of the media by the combinations of the switches.

Table 32. Tray 2 and 500-sheet feeder media size switch settings

Paper size		Media size switch setting
	Upper	Center	Lower
No cassette installed	Off	Off	Off
A4	Off	Off	On
LTR	Off	On	Off
B5	Off	On	On
A5	On	Off	Off
EXE	On	Off	On
LGL	On	On	Off
UNV	On	On	On
Table 33. 1,500-sheet feeder media size switch settings
Paper size		Media size switch setting
	Upper	Center	Lower
No cassette installed	Off	Off	Off
A4	On	Off	On
LTR	Off	On	On
LGL	On	On	Off

The tray 2 cassette can detect the media size using the switches describe above, however the user can define the media size for the tray using the control-panel (see “Paper Handling menu” on page 42). In this case the printer may not correctly detect the media size if the user’s defined size does not match the tray settings.

To prevent a false size detection, the printer measures the time it takes for the media to pass from its leading edge to its trailing edge and determines the media size that was fed from the tray. When the measured size differs from the user’s defined size or from the media size switches, a message will appear on the control-panel display (see “Alphabetical printer messages” on page 258).

Q2431-90912 Chapter 5 Theory of operation 83