The diagnostics light is flashing, The wait light is flashing, The wait and diagnostics lights are both flashing – HP Designjet 4500 Printer series User Manual
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The diagnostics light is flashing
The most likely explanation is that the scanning area needs cleaning. Perform the routine
maintenance procedures explained in your online guide, which include cleaning. Restart the scanner
when you have finished the maintenance procedures.
If the light continues to flash, there may be camera position errors. In this case, contact HP Support.
The wait light is flashing
This indicates that the scanner needs to make some readjustment but is unable to do so. Remove all
paper from the scanner, ensure the insertion slot height is set to minimum, and wait for the light to
turn off.
The wait and diagnostics lights are both flashing
In this case, disregard the wait light and respond only to the diagnostics light. See The diagnostics
light is flashing.
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Chapter 22 The problem is... (scanner topics) [4500]
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The problem is...
(scanner
topics) [4500]