HP LaserJet II Serie Manual De Instrucciones página 235

HP 33440/HP 33449 COMBINED SERVICE MANUAL
Beam-to-Drum Mirror Assembly Functional Check
In order for the laser b- ~ reach the surface of the EP drum &r it ti~ the her/Smnning
Assembly, it must reflect off a properly positioned Beam-to-Drum Mirror. The mirror is normally
blocked by the Mirror Shutter Assembly. When an EP-S Cartridge is i@ed, it cbntacts a lever
on the lefi side of the Mirror Shutter Assembly, doting the shutter b f~ away from the mirror
when the Top Cover Assembly is dosed.
With the Top Cover Assembly opened to its 45° position and the EP-S Cartridge removed, gently
push the botim of the shutter locking assembly on the lefi side of the Mirror Shutter Asembly.
If the shutier does not fdl away from the mirror, check for the source of the binding and resolve.
(See Figure 7-26).
Ensure that the Mirror Assembly is intied properly between the EP-S Cartridge Guide and the
Top Cover Assembly and that it is positioned on its guide pins as described in Chapter 6.
~ Visually obsewe from tis mgle
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/
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Assembly Here
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beam-to-Drum
Mirror
Figure 7-26. Beam-to-Drum Mirror Assembly
EP-S Cartridge Guide Functional Check
~enever an EP-S Cartridge is itied in the EP-S Cartridge Guide in the Top Cover Assembly,
protrusions on the right side of the guide are used to open two shu~rs on the top side of the
EP-S Cartridge the Erase kp Shutter and the Beam Shutir. As the Top Cover Assembly is
dosed, a protrusion in the base of the printer opens the drum shutter (or shield) on the bottom of
the EP-S Cartridge.
With the Top Cover Assembly open at 45°, slowly stide an EP-S Cartridge into the cartridge guide
and, looking over the top of the EP-S Cartridge, note whether both shutters are opening properly.
If W is we~, the surface of the EP drum shotid be visible when looking diretiy over the top of the
idled EP-S Cartridge (see Fignre 7-26).
7-71