HP 2500 L Service Manual

EN 6 Troubleshooting199
Pages print, but all 
colors do not print or 
the pages are 
completely blank. One of the print cartridges might be 
low or empty.
Run an engine test (see page 205) and see if all four colors print. If 
not all colors print, replace one or more of the print cartridges. If the 
engine test is successful, replace the formatter.
If the printed pages are completely 
blank, the file might have blank 
pages.  Check the file to make sure that it does not contain blank pages.
A print...

200Troubleshooting C9706-90926
The printer prints, but 
the text is wrong, 
garbled, or 
incomplete.The interface cable is loose or 
defective.
Disconnect the printer cable and reconnect it. Try a print job that 
you know works. If possible, attach the cable and printer to another 
computer and try a print job that you know works. Finally, try a new 
cable.
The printer is on a network or sharing 
device and is not receiving a clear 
signal. Disconnect the printer from the network or shared drivers and...

EN 6 Troubleshooting201
Solving PostScript (PS) errors
The following situations are specific to the PS language and might occur when several printer 
languages are being used.
Note To receive a printed or an onscreen message when PS errors occur, select this option in the PS 
printer driver or the embedded Web server.
Symptom Possible Cause Solution
The job prints in 
Courier (the printer 
default typeface) 
instead of the 
typeface you 
requested. The requested typeface is not 
downloaded. A personality...

202Troubleshooting C9706-90926
Solving common Macintosh problems
In addition to the problems listed in “Solving general printing problems ” on page 197, this section 
lists problems that can happen only when using the Mac OS, versions 9.1 to OS X.
Symptom Possible Cause Solution
Problems in the Chooser
The printer driver 
icon does not appear 
in the Chooser (when 
using Mac OS, 
version OS X). The software was not installed 
correctly.
The LaserWriter driver should be present as a part of the Mac OS....

EN 6 Troubleshooting203
An encapsulated 
PostScript (EPS) file 
does not print with 
the correct fonts.  This problem occurs with some 
programs. 
Try downloading the fonts contained in the EPS file to the 
printer before printing.

Send the file in ASCII format instead of a binary encoding.
Your document is not 
printing with New 
York, Geneva, or 
Monaco fonts.  The printer might be substituting 
fonts.
Select 
Options  in the Page Setup  dialog box to clear the 
substituted fonts.
USB Problems
You are...

204Troubleshooting C9706-90926
Rotating the print-cartridge carousel
Under normal conditions, pressing  (ROTATECAROUSEL) brings another print cartridge to the 
top position. However, if the carousel does not rotate, do the following:
1 Open the top cover.
2 Use a small flatblade screwdriver to lift up the carousel brake (callout 1).
Note In figure 108, the top cover is removed.
3 Rotate the carousel manually.
Figure 108. Rotating the print-cartridge carousel
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EN 6 Troubleshooting205
Functional checks
Engine test
The engine test is used to verify that the print engine is functioning correctly. The formatter is 
bypassed during an engine test, so the engine test is useful for isolating printer problems. 
Because the engine test prints horizontal lines along the entire printable area of a page, it is also 
useful for checking and adjusting registration.
Printing an engine test
The engine test switch is inside tray 1, on the left side, just below the front...

206Troubleshooting C9706-90926
Half self-test functional check 
The electrophotographic process can be subdivided into the following stages:

image-formation stage (charges the drum and writes a latent image to the drum with the 
laser)

development stage (forms a toner image on the drum)

transfer stage (transfers the image to media)

cleaning stage (removes excess toner from the drum)

fusing stage (applies heat and pressure to make the image permanent on the media)
To perform a half self-test check...

EN 6 Troubleshooting207
Heating element check 
Media passes between the heating element and a soft pressure roller to fuse the toner to the 
media.
1Unplug the printer for at least ten minutes.
2 Verify that the thermistor connector is seated into both the printer chassis and the low-
voltage power supply.
3 Remove the heating element connector (callout 1) from the low-voltage power supply. To 
measure the continuity of the heating element, measure the resistance between the two pins 
at the end of the...

208Troubleshooting C9706-90926
Paper-path check 
If media is not being picked up or is not moving through the paper path, you might want to 
observe all of the paper-motion activities. Override the door interlock (SW301) to observe: 

motor rotation

solenoid action

pickup-roller motion

drive-roller, transfer-roller, fuser-roller and gear, and delivery-roller motion
To override SW301
Push a piece of heavy paper into the slot in the top cover (callout 1) to engage SW301.
Figure 111. Overriding SW301 
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