Feed Roller Assembly Functional Check - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
SL301
Electrical Check
Remove the Bottom Covers. Solenoid SL301 may be electrimlly checked, using frame ground as a
reference, by monitoring J213-04 (CPUD) while performing a TEST PRINT. The voltage should
~tch from OVdc to + 5 Vdc (enabled). If the voltage changes but SL301 is NOT being energized,
replace the Paper Control PCA (on which SL301 is mounted). If the voltage does not change,
replace the DC Controller PCA. Note: Since this is a momentary signal, an oscilloscope may be
required to view it.
Table 7-13. Paper Feed Mechanical
Checks
1. Does the paper have a slight
bow (bucMe) when it contacts the
Registration Rollers? (See Figure
7-11.)
2. Is the flat surface of the Paper
Pickup Roller facing the Separation
Pad?
3.
Is more than one page being fed to
the Registration Rollers?
If the roller is picking paper, yet the paper is not entering
the Registration Rollers, the Feed Roller Assembly
is either worn or installed incorrectly. Replace the
Feed Roller Assembly and Separation Pad. See the
following "Feed Roller Assembly Functional ChecK' for
verifimtion.
If the flat portion of the roller does not face the pad when
in the idle state, the roller is installed incorrectly or is
defective. Replace the Feed Roller Assembly as described
in Chapter 6.
Multiple pages being fed from the input tray is a result of
the media having a poor cutting edge, a worn Separation
Pad, or a damaged paper tray. Resolve as appropriate.
Feed Roller Assembly Functional Check
If the Feed Roller Assembly is excessively worn, paper will not be pulled completely to the
Registration Rollers. To verify, measure the distance from where the trailing edge of the paper
momentarily stops to the front of the paper tray (see Figure 7-13). The trailing edge of the paper
should stop about 3.5 inches (95mm) from the front fence of the paper tray. If the paper has not
advanced the specified distance, replace the Feed Roller Assembly and Separation Pad.
I
\
m
~-–_ .-
I
1'
L–—
-
""
,
)J
II
+
Printer
/
—n.
3.5
inches
(95mm)
6
—k
Front Fence
/
Of The Paper
,
PaperTray
Tray
Figure 7-13. Feed Roller Wear
7-37