HP LaserJet II Serie Manual De Instrucciones página 209

HP 33440/HP 33449 COMBINED SERVICE MANUAL
Table 7-17. "14 NO EP CART" Checks
1. 1s an EP-S Cartridge instiled in the printer? Instil cartridge if necessary.
2. Is there at least one sensitivity tab on the Visually inspect. The EP-S Cartridge must
EP-S Cartridge?
have at least one sensitivity tab. If the cartridge
has no tab, replace the EP-S Cartridge.
3.
Is the Paper Control PCA firmly seated into Vlsudly inspect. Ensure that none of the pins
its connector? are bent or damaged.
4. Is
the Paper Control PCA defective?
See the "Drum Sensitivity Switches (SW301
and SW302) Functional Check" following this
table.
5.
Is DC Controller PCA defective? See the "Drum Sensitivi@ Switches (SW301
and SW302) Functional Check" following this
table.
Drum Sensitivity Switches (SW301 and SW302) Functional Check
The EP-S Cartridge Drum Sensitivi@ microtitches (SW301 and SW302) are located on the Paper
Control PCA. If either microswitch is bad, the Paper Control PCA must be replaced.
Operational Check
1.
2.
3,
4.
Open the printer's Top Cover Assembly.
Defeat the Top Cover Assembly closed interlock switch in the DC Power Supply Assembly.
Press switch SW301 (refer to Figure 7-17). The display should change from 14 NOEP CARTto
00 READY.
Release SW301 and the Top Cover Assembly interlock switch and repeat steps 2 and 3, testing
SW302. Again, the display should change from 14 NOEP CARTto 00 READY.
If this test fails, either the Paper Control PCA or DC Controller PCA is defective. Proceed with the
following Electrical Check to determine the failing component.
Electrical Check
Verify that the EP-S Cartridge In-Place/Drum Sensitivi@ microswitches are functional as follows:
1.
2.
3.
Remove the printer's bottom covers.
Using FWE GND as a reference, measure J213 pin 1 (CSENS1) and J213 pin 2 (CSENS2),
respectively, on the DC Controller PCA. The measured voltage level should change from + 5 Vdc
(switch open) to OVdc (switch closed) as referenced to frame ground.
If the voltiges DO NOT change while the titches are pressed, replace the Paper Control PCA.
If the voltage levels change but the error message persists, replace the DC Controller PCA.
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