HP Designjet 4500 Printer series - Manual (Page 252)

When a paper jam occurs, you will normally see the Possible paper jam message in the front panel,
with one of two error codes:
● 81:01 indicates that paper cannot advance into the printer.
● 86:01 indicates that the printhead carriage cannot move from side to side.
Check printhead path
1. Switch off the printer at the front panel, then also switch off the power switch at the rear.
2. Open the window.
3. Try to move the printhead carriage out of the way.
238 Chapter 17 The problem is... (paper topics) ENWW
The problem is... (paper
topics)