HP 3150 EN - Manual (Page 179)

EN Functional checks 177
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 paper)
● Cleaning stage (removes excess toner from the drum)
● Fixing stage (applies heat and pressure to make the image on
paper permanent)
The purpose of the half-self test check is to determine which process
is malfunctioning. Perform the test as follows:
1 Initiate a self test.
2 Open the printer door after the paper advances half-way through
the printer (about 8 seconds after the motor begins rotation). The
leading edge of the paper should have advanced past the toner
cartridge.
3 Remove the toner cartridge.
4 Open the toner cartridge drum shield to view the drum surface. If
a dark and distinct toner image is present on the drum surface,
assume that the first two functions of the electrophotographic
process are functioning (image formation and development).
Troubleshoot the failure as a transfer or fixing problem.
If there is no image on the photosensitive drum, perform the following
functional checks:
1 Make sure you have removed the entire length of the sealing tape
from the toner cartridge before you installed the cartridge.
2 Perform a drum rotation functional check.
3 Perform a high-voltage power supply check.