HP P2055 Manual

Table 7-5  Rear-side components
ReferenceComponentDescriptionIf disconnected or blocked
1PS918Duplex reverse sensor flag (J208)
(HP LaserJet P2050 Series
Printers only)Control-panel message:  Jam in
output bin  appears.
2PS915Photosensor flag for fuser (J206)Control-panel message:  Jam in
output bin  appears.
3White leverWhen the rear door is closed, this
lever positions the photosensor
flag for the fuser (PS915) to
detect paper exiting the fuser. 
4 Reverse sensor assembly Detects paper during the...

Figure 7-8  Components on the top of the product
1
2
Table 7-7  Top components
ReferenceComponentDescriptionIf disconnected or blocked
1PS911Output bin media full sensorControl-panel message:  Output
bin full appears.
2 Flag Rotates to block sensor as the
output bin fills  
Figure 7-9  Components on Tray 1 and Tray 2
2
1
3
200 Chapter 7   Solve problems
ENWW 

Table 7-8  Tray 1 and Tray 2 components
ReferenceComponentDescription
1FlagPhotosensor flag for Tray 1 paper present sensor
(PS916)
2FlagPhotosensor flag for Tray 2 paper present sensor
(PS914)
3 PS916 Photosensor (J205)
ENWW Tools for troubleshooting 201 

Problem-solve diagrams
●Repetitive image defect ruler
●
Engine controller PCA
●
Major components
●
PCAs
●
General timing chart
●
Circuit diagram
Repetitive image defect ruler
Defects on product rollers can cause image defect s to appear at regular intervals on the page,
corresponding to the circumference of the roller that  is causing the defect. Measure the distance between
defects that recur on a page. Use the following table  or the repetitive-defect ruler to determine which
roller is causing the...

Engine controller PCA
Figure 7-10  Engine controller connectors
J102
J101
J215
J202
J207
J211
J208
J581
J205 J204
J203
J206 J210
J213
J201
J2142
J2141
NOTE: Control-panel messages appear on HP La serJet P2050 Series Printers only.
Table 7-10  Engine controller connectors
ItemDescriptionWhen disconnected
J101AC voltage to engine controllerNo AC voltage to engine controller
J102AC voltage to fuserNo AC voltage to fuser
J201Formatter PCA 
J202Main motor (M1)Control-panel message: Initializing... appears1...

ItemDescriptionWhen disconnected
J204Tray 2 paper present sensor (PS914)Control-panel message:Load paper appears1
J205Tray 1 paper present sensor (PS916)No message appears unless you request paper from
Tray 1.
J206Fusing assembly exit sensor (PS915)Product attempts to pull paper.
Control-panel message: Jam in cartridge area  or
Open door and clear jam   appear
1
J207Connecting PCAControl-panel message: Initializing... appears1
J208Duplex reverse sensor (PS918) (HP LaserJet P2050
Series Printers...

Major components
Figure 7-11  Major components
13
4
2
65
Table 7-11  Major components
ItemDescription
1Fuser
2Laser/scanner assembly
3Registration assembly
4Duplex feed unit (HP LaserJet P2050 Series Printers only)
5Duplex-drive-unit assembly (HP LaserJet P2050 Series Printers only)
Face-down-drive assembly (HP Lase rJet P2030 Series Printers only)
6Main drive unit
ENWW Problem-solve diagrams 205 

PCAs
Figure 7-12  PCAs
Table 7-12  PCAs
ItemDescription
1Engine controller unit
206 Chapter 7   Solve problems ENWW 

General timing chart
Figure 7-13  General timing chart
I. GENERAL TIMING CHARTTiming chart for two consecutive prints on letter paper
STBY
RTSL
TNIRP
RTNI
YBTS
TIAW
19
20 17
18 15
16
13
Tray 2 pickup solenoid (SL2)
14 Main Fan (FM1)
11
Transfer Charging Bias
12 Fusing Heater
9
Primary Charging Bias (DC)
10 Developing Bias
7
Main Motor (M1)
8 Primary Charging Bias (AC)
5
Laser Diode
6 BD Output signal (BDO)
3
Print start command (EEC12)
4 Scanner Motor Operation
1 TOP sensor (PS912)
2 Fusing delivery...

Circuit diagram
Figure 7-14  Circuit diagramA
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M12
3
45
23
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54
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12
3
45
2
121
12 12
MT112
21
2
1
END1
END2
12
MT2
123 321
123 321
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42
13 321
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4
123
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