HP LaserJet II Serie Manual De Instrucciones página 238

HP 33440/HP 33449 COMBINED SERVICE MANUAL
Table 7-45. High-Voltage System Checks
1. Are any of the following supply
connectors damaged, corroded, dirty, or
missing?
K prima~ Corona connector.
prima~ Corona Grid connector.
D~m Ground
connector.
Developing Bias connector.
Toner Level Sensor connector (and
connecting wire).
2. Inspect the EP-S Cartridge and verify that
the following connectors are not damaged,
dim, or missing:
w pfima~ Corona connector.
Primary Corona Grid connector.
Dmm Ground
connector.
Developer Bias connector.
E Toner Sensing connector.
3. Is the Primary Corona wire broken,
resulting in black pages?
4. Are the Light-Blocking shutters on the
EP-S Cartridge opening? (A closed laser
shutter will result in white pages.)
5. Is the protective shutter conceding the
Top Cover's reflecting mirror being released
when the EP-S Cartridge is instied?
6. Is the Beam-to-Drum Mirror dirty?
7. Is the High-Voltage Power Supply
Assembly correctiy seated into its connector
to the DC Controller PCA?
8. Is connector J211 on the DC Controller
PCA properly connected?
9. Do the EP-S Cartridge's sensitivi~
switches function?
10. Do the Erase Lamps function?
11. Do the Primary Coron~ Developer
AC Bi~, and Developer DC Bias signals
function?
Visually inspect each item. (See Figure 7-28).
If any of the items are damaged, correct as
necessary. Replace the High-Voltige Power Supply
if the connetion is unable to be corrected. Ensure
that W wires are connected to their respective
terminals.
Visually inspect (see Figure 7-27). Correct, or if
necessary, replace the EP-S Cartridge.
Inspect. (See Figure 7-29.) If broken, replace the
EP-S Cartridge.
Inspect the EP-S Cartridge's top to verify that the
shutter tabs are not broken or damaged (See Fig
7-29). Inspect the Top Cover Assembly to veri~
that the plastic protrusions which open the EP-S
Cartridge shutters are not damaged.
Intil the EP-S Cartridge. Visually inspect to see
if the mirror's protective shield swings open as the
Top Cover Assembly is closed.
Inspect the mirror. If dirty, clean per the
procedure described in Chapter 4.
Vlsudly inspect. If necessary, remove the
assembly h verify that dl pins are in their
respective connectors.
Remove the bottom cover and visually inspect the
connector. Reseat or replace if necessary.
Refer to the "Drum Sensitivi@ Switihes (SW301
and SW302) Functional Check" in Section 7-4.
Perform the "erase lamp fnnctiond Chec~' which
follows.
Perform the "Primary Corona," "Developer AC
Bias," and "Developer DC Bias" functional checks
which fo~ow.
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