User Guide

HP LaserJet 4250 general timing diagram
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WAIT
Signal
STBY
INTR
PRINT
STBY
LSTR
Power switch ON
(Unit: seconds)
Print reservation designation (EEC50)
Print start designation (EEC12)
Video (VDO1, /VDO1,VDO2, /VDO2) Main motor (M101)
Drum motor (M102)
Scanner motor
Laser
Cooling fan #1 (FN101)
Cooling fan #2 (FN103)
Topofpage (/T
OP)
Cassette pickup solenoid (SL101)
Feed roller clutch (CL101)
Pre-feed sensor (PS102)
Topofpage sensor (PS103)
Paper width sensor (PS106)
fuser unit delivery paper sensor (PS108)
Face-down tray paper full sensor (PS104)
Primary charging bias (AC)
Primary charging bias (DC)
Developing bias (AC)
Developing bias (DC)
Transfer charging bias
fuser film bias
Pressure roller bias
fuser heater (H1, H2)
0.5
Approx.
0.2
Approx.
0.2
Approx. 0.17
Approx. 0.18
Approx.
0.25
Approx.
0.2
Approx.
1.2
Approx.
0.1
Approx.
0.06
Approx.
0.8
Approx.
0.43
Approx.
0.09
Approx. 0.75
0.5
Approx.
0.36
Approx.
0.11
0.03
30.0
30.0
Approx. 0.5
Approx. 5
Approx. 5
Approx. 5
Approx. 5
Approx.
0.02
Approx. 0.03
Approx.
0.02
Approx.
0.5
Approx.
1.5
Approx. 1.01
Approx. 0.96
Approx. 1.01
Approx. 0.89
Approx. 1.78
Approx.
0.17
Stand-by control
Full-speed rotation
Stand-by control
Low-voltage bias
Print bias
Between-sheet bias
Negative bias
Approx.
0.17
Approx.
0.43
Approx.
3.8
Approx.
0.06
Approx.
0.14
Approx. 1.01
Approx.
0.2
Eliminate drum charge
Approx.
0.02
Approx.
0.61
Approx.
0.56
Approx.
0.22
Approx.
1.44
Timing chart for continuous 2 sheets printing in letter size
Figure 7-38 HP LaserJet 4250 general timing diagram
General timing diagrams 439