HP LaserJet II Serie Manual De Instrucciones página 219

HP 33440/HP 33449 COMBINED SERVICE MANUAL
warniEg DO NOT place anything in the Laser/Scanning Assembly access hole other than
B
@
the Laser Checker Tool. Although the laser beam is invisible, the reflected
beam could possibly damage the eye.
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Switch the printer power to OFF and open the Top Cover Assembly.
Remove the printer's Main Body Cover Assembly (on HP 33449, the top cover panel).
Heed the Laser Safe@ Label attached to the top of the Laser/Scanning Assembly to avoid
possible injury.
Keep the Control Panel connector attached to the printer so the display can be read.
Open the plate covering the access hole for the laser power checker tool on the Laser/Scanning
Assembly. Instil the laser power checker tool into the opening (see Figure 7-23).
Connect the laser power tool leads to a digiti multimeter and set the range to 200 mV DC.
Defeat the top-cover-in-place microswitch. Press down both EP-S Cartridge Drum Sensitivity
Mlcroswitches (SW301 and SW302).
Switch the printer's power ON.
Note
When the laser tool is instiled in the printer, only one page of the Self Test will
run before a 51 ERROR (Beam Detect Malfunction) appears on the printer's display
d
panel. The laser power checker tool must have been dibrated within the last
year to be effective.
9. With the laser tool instiled (see Figure 7-23), the interlock switches defeated, and the voltmeter
connected, perform a self test and veri~ the laser output.
The measured output should be 17.6 (f 1.6) millivolts. If this laser power cannot be measured,
replace the following assemblies in the order listed
1. Laser/Scanning Assembly.
2. Laser/Scanning Cable Assembly to the DC Controller.
3. DC Controller PCA.
Laser
Power
Checker Tool
Laser/Scanner
Figure 7-23.
installing Laser Power Checker Tool
7-55