Paper Jam Detection - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
Paper Jam Detection
Any paper movement problem normally restits in a paper jam indimtion. Ml paper jam detection
centers around the Paper Exit Sensor (PS331) on the Thermistor/Exit Sensor PCA being
interrupted by the Exit Sensing Arm photointerrupter on the Fusing Assembly. This sensor
detects the presence or absence of paper and inputs this information to the main DC Controller
microprocessor where it is stored in memory. From this information, the microprocessor
determines when a paper jam has occurred. The following conditions result in a paper jam
1. When paper does not reach the Fusing Assembly within a specified time.
2. When paper does not clear the Fusing Assembly within a specified time (dependent upon
current paper size as determined by SW201, SW202, and SW203 on the DC Controller PCA).
3. When paper is present in the Fusing Assembly at printer power ON and the fuser temperature
is lower than 150° C.
To effectively troubleshoot a paper jam problem, the position of the leading and lagging edges of
the media must be noted. The rest of this section is subdivided according to the position of any
jammed paper (or other media) in the printer.
Table 7-8. "13 PAPER JAM" Checks
CHEC@ AC~ON
1. Is there media in the input tray?
If not, refer to "Paper Out Sensor (PS301)
Functional ChecV' earlier in this section.
2. Does the error occur at initial power-on or If so, clear any media from the Fusing
whenever the Top Cover Assembly is closed?
Assembly. If the problem persists, see Table
7-16, "Paper Exit Sensor (PS331) Check."
3. Can the printer support the media being Retest using suppotible media. (See Chapter 2
used? for media information.)
4. Does the leading edge of the media reach the If not, begin with Table 7-9, "Paper Feed Area
Registration Rollers? Checks."
5. Does the media enter the Fusing Assembly?
If not, see Table 7-14, "Registration/Transfer
Area Checks."
6. Does the media actually (visibly) jam after Yes: See Table 7-15, "Exit Area Checks."
reaching the Fusing Assembly?
No:
1. If using the Manual Feed slot, ensure the
proper size paper is being used.
2." Perform "Tray Size Switches (SW201,
SW202, SW203) Functional Check" earlier
in this section.
3. See Table 7-16, "Paper Exit Sensor (PS331)
Check."
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