HP 1018 Service Manual - Page 115

Functional checks, Half self-test functional check, To perform a half self-test check

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Functional checks This section includes five functional checks for troubleshooting. Half self-test functional check The print 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 The purpose of the half self-test check is to begin the printing process and then interrupt it in the middle. Examining the printer components at that point allows you to determine which stage in the print process is malfunctioning. 1. Open the Printer Properties dialog box. Select Print Test Page to print a test page. Click OK to close the HP LaserJet 1018 test page troubleshooting dialog box. Click OK again to close the Printer Properties dialog box. 2. Open the print-cartridge door the instant the leading edge of the paper exits the printer. 3. Remove the print cartridge. 4. Open the print cartridge drum shield to view the drum surface. If a dark and distinct toner image is present on the drum surface, then the first two functions of the electrophotographic process are functioning (image-formation and development). Any failure is occurring in the transfer or fusing stage. To perform other checks If no image appears on the photosensitive drum, perform these checks: 1. Make sure that you remove the entire length of the sealing tape from the print cartridge before you install the cartridge. If the tape is not removed, then toner cannot reach the drum. 2. Perform a drum-rotation functional check to ensure that the drum is rotating (see Drum-rotation functional check on page 109). 3. Perform a high-voltage contact check (see High-voltage-contacts check on page 110). ENWW Functional checks 107

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Functional checks
This section includes five functional checks for troubleshooting.
Half self-test functional check
The print 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
The purpose of the half self-test check is to begin the printing process and then interrupt it in the
middle. Examining the printer components at that point allows you to determine which stage in the
print process is malfunctioning.
1.
Open the
Printer Properties
dialog box. Select
Print Test Page
to print a test page. Click
OK
to close the
HP LaserJet 1018
test page troubleshooting dialog box. Click
OK
again to close
the
Printer Properties
dialog box.
2.
Open the print-cartridge door the instant the leading edge of the paper exits the printer.
3.
Remove the print cartridge.
4.
Open the print cartridge drum shield to view the drum surface. If a dark and distinct toner image
is present on the drum surface, then the first two functions of the electrophotographic process
are functioning (image-formation and development). Any failure is occurring in the transfer or
fusing stage.
To perform other checks
If no image appears on the photosensitive drum, perform these checks:
1.
Make sure that you remove the entire length of the sealing tape from the print cartridge before
you install the cartridge. If the tape is not removed, then toner cannot reach the drum.
2.
Perform a drum-rotation functional check to ensure that the drum is rotating (see
Drum-rotation
functional
check
on
page
109
).
3.
Perform a high-voltage contact check (see
High-voltage-contacts
check
on
page
110
).
ENWW
Functional checks
107