HP LaserJet II Serie Manual De Instrucciones página 218

HP 33440/HP 33449 COMBINED SERVICE MANUAL
Table 7-21. "51 ERROR" Beam Detect Checks
1. If intermittent, have checks 1-8 in Table 7-20
("41 ERROR Checks") been performed?
2. Is –5 Vdc present?
3.
Is the laser shutter protrusion tab on the
EP-S Cartridge broken or damaged?
4.
Is the laser shutter interlock mechanism
damaged?
5. Is the Fiber Optic Cable between the
Laser/Scanning assembly and J201 of the DC
Controller PCA correctiy seated into each
respective assembly?
6.
Are connectors J202 on the DC Controller
and J451 on the Laser Drive PCA properly
seated?
7. Is +5 Vdc present at J451-1 of the Laser
Drive PCA?
8. Is the Laser Unit defective?
9. Is the Laser/Scanning Cable Assembly
damaged?
Perform verification procedures.
Veri& per Figure 7-2. If missing, replace the
DC Power Supply. If –5 V is sti absent,
replace the DC Controller PCA.
Vlsudly insped (see Figure 7-19). Replace the
EP-S Cartridge if necessary.
Carefully inspect the Laser Shutter Arm
mechanism. If necessary, remove the
Laser/Scanning Assembly and inspect the pivot
lever. Replace the mechanism if damaged.
Visually inspect the cable for damage and
ensure that it is seated properly. Is the cable
damaged? If neceswry, remove the Fiber Optic
Cable and shine a light through the cable to
veri& light continui@. Replace the cable if
damaged.
Warnin& Do not use the laser light to
perfom this test.
Inspect connectors and wiring. Reseat or
replace cables if necessary.
Veri& voltage with voltmeter. If voltage is not
presen~ replace cable to DC Controller.
Veri& the laser power level per the following
instructions. If the laser power is acceptable,
replace the DC controller PCA.
Closely inspect cable assembly. Examine for
damaged wire crimps at the connector ends
of the assembly. Replace harness assembly if
damage is suspected.
Laser Power Verification
Required Tools
The following special tools are required for this verification procedure:
Laser Power Checker # TW-0198-OOOCN
Digiti Voltmeter (+/– 200mV DC Range)
Laser Power Output Check
The laser power circuit~ is not adjustable. However, if it becomes necessary to veri& the laser
output, use the following procedures.
7-54