HP LaserJet 1010 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 paper) ● cleaning stage (removes excess toner from the drum) ● fusing stage (applies heat and pressure to make the image on paper permanent) 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 right in the middle. Examining the printer components at that point allows you to determine which stage in the print process is malfunctioning. 1. Press the Go button to print a demo (self-test) page. 2. Open the print cartridge access 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, this shows that 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 there is no image on the photosensitive drum, perform these checks: 1. Make sure you removed the entire length of the sealing tape from the print cartridge before you installed the cartridge. If the tape is not removed then toner cannot get to the drum. 2. Perform a drum rotation functional check to ensure that the drum is rotating. (See below.) 3. Perform a high-voltage contact check. (See below.) If a transfer problem, replace the transfer roller. If a fuser problem, first check to make sure the three cables to the fuser are properly seated in the engine power assembly. ENWW Functional checks 103

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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 paper)
●
cleaning stage (removes excess toner from the drum)
●
fusing stage (applies heat and pressure to make the image on paper permanent)
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
right in the middle. Examining the printer components at that point allows you to determine
which stage in the print process is malfunctioning.
1.
Press the Go button to print a demo (self-test) page.
2.
Open the print cartridge access 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, this shows that 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 there is no image on the photosensitive drum, perform these checks:
1.
Make sure you removed the entire length of the sealing tape from the print cartridge
before you installed the cartridge. If the tape is not removed then toner cannot get to the
drum.
2.
Perform a drum rotation functional check to ensure that the drum is rotating. (See below.)
3.
Perform a high-voltage contact check. (See below.)
If a transfer problem, replace the transfer roller. If a fuser problem, first check to make sure
the three cables to the fuser are properly seated in the engine power assembly.
ENWW
Functional checks
103