Cordiales saludos: Qué diagnostico se le puede dar a una impresora hp 4050 cuyo toner se queda en el rodillo donde se apoya el tambor,sí en el rodillo negro de la impresora donde se apoya el tambor sacando las hojas totalmente blancas. Si alguien sabe de ke puede ser o si le sucedió a alguien estaría mu agradecido...

Table 7-12. Blank Page Possible Cause Action No Toner is available for print. Remove sealing tape or replace the Toner Cartridge. Defective laser shutter. Check the laser shutter for free operation when inserting the Toner Cartridge. Toner Cartridge Guide damaged, improperly positioned, or missing. Make sure the guide is installed properly above the Toner Cartridge. No Transfer Roller voltage. Without Transfer Roller voltage, Toner cannot be attracted from the surface of the Drum to the paper. Perform the Half Self Test Functional Check (page 7-74) to check all other electrophotographic processes. Replace the Transfer Roller if necessary. No developing bias. 1. Clean the High-voltage Power Supply Contacts. With no developing bias charge, Toner is not attracted to the Drum. 2. Replace the Engine Controller Board. No Drum Ground Path. With no ground path the Drum cannot discharge. The negative charge on the Drum repels Toner, and leaves a white page with bubble print. 1. Check the Drum Ground Spring and connect it as shown on page 6-44. 2. Replace the Engine Controller Board. Defective laser Scanner Cable Assembly. Low-level signals exchanged between the Laser Scanner Assembly and the Engine Controller Board may be affecting laser output. Replace the Laser Scanner Cable Assembly.