HP LaserJet II Serie Manual De Instrucciones página 215

HP 33440/HP 33449 COMBINED SERVICE MANUAL
Thermoprotector/Fuser Bulb Functional Check
Electtiml Check
The Fuser Bulb and the Thermoprotector are wired in series. To quictiy check these components,
perform the following eledrid check procedure
1.
2.
3.
Remove the Fusing Assembly.
Using an ohm meter, check for continui@ at the two pin connector (J103) at the right side of
the Fusing Assembly (see Figure 7-22).
If an open condition is detected, either the Fuser Bulb or the Thermoprotector is open. To
differentiate between an open Fuser Bulb and an open Thermoprotector, proceed as follows:
a. Remove the screw securing the lefi side of the Fuser Bulb connector to the Thermoprotector
connector.
b. Verify the continuity of the bulb from ih connector wire to the rear connector of the two pin
connector.
If the bulb is open, replace the complete Fusing Assembly. E the bulb appears good, but the serial
continui~ measurement indicates an open condition, replace the Thermoprotector.
c
Fusino
Roller-
\
Fuser
Bulb
/
/
Thermopr6tector
.
Thermistor
\
Figure 7-22. Thermoprotector/Fuser
Bulb Check
7-51