HP P3015 Service Manual

							Figure 1-29  Solenoids and clutches (Tray 3 and Tray 4)
PS451
PS8008
SL3
M8001
SW461
CL1
Table 1-13
  Solenoids and clutches (Tray 3 and Tray 4)
ItemDescription
SL3Paper feeder pickup solenoid
CL1Paper feeder pickup clutch
1Tray 3 and Tray 4 are identical 500-sheet input trays.
ENWW Pickup, feed, and delivery system 37 
						

							Tray 1 or Tray 2
Pickup and feed unit
The pickup and feed unit uses the following components and processes.
Cassette paper size detection/cassette paper detection
NOTE:To find the following components, see Photo sensors and switches on page 34.
● PS3; cassette media-presence sensor
● PS225; media width sensor (detects media width 
after the media enters the paper path)
Cassette pickup
NOTE: To find the following components, see Solenoids and clutches on page 36.
●SL2; cassette (Tray 2) pickup solenoid
Tray 1 paper pickup
NOTE:
To find the following components, see Photo sensors and switches on page 34 and Solenoids
and clutches on page 36.
● PS205; Tray 1 (multipurpose tray) media-presence sensor
● SL1; Tray 1 (multipurpose tray) pickup solenoid
38 Chapter 1   Theory of operation ENWW 
						

							Paper pickup and feed
The following figure shows the pickup and feed paper path.
NOTE:Duplex models include a duplex media-feed path for automatic two-sided printing.
Figure 1-30   Pickup, feed, and delivery block diagram
Pressure rollerFuser film
Photosensitive drumTransfer roller
Delivery roller
MP tray pickup roller 
Cassette pickup roller
Simplex media path
Duplex media pathMP tray separation pad
Cassette separation pad
ENWW Tray 1 or Tray 2 39 
						

							Jam detection
The product uses the following sensors to detect the presence of media and to check for jams. If media
does not reach or pass each sensor within a specified time, the ECU determines that a jam has occurred
and alerts the formatter.
NOTE:To find the following components, see Photo sensors and switches on page 34.
● PS2; fuser delivery sensor
● PS4; face-down tray media-full sensor
● PS215; Top-of-Page (TOP) sensor
● PS225; media width sensor
● PS502; duplex media-feed sensor (duplex models only)
● PS8008; paper feeder media-feed sensor
NOTE:
PS8008 is used in Tray 3 and Tray 4.
The product detects the following jams:
●Pickup delay jam
● Pickup stationary jam
● Delivery delay jam
● Delivery stationary jam
● Fuser wrapping jam
● Door open jam
● Residual media jam
● Duplex repickup jam (duplex models only)
40 Chapter 1   Theory of operation ENWW 
						

							Additional tray
NOTE:This product supports identical 500-sheet input trays (Tray 3 and Tray 4).
Tray driver PCA
The following figure shows the signals between the DC controller and the tray driver PCA.
Figure 1-31   Tray 3 and Tray 4 driver PCA block diagram
Paper feeder
connector PCB Clutch
Solenoid
Photointerrupter
DC controller
Switch
+24V
Optional paper feeder
ENWW
Additional tray 41 
						

							Paper pickup and feed
NOTE:Tray 3 and Tray 4 are identical 500-sheet input trays.
The following figure shows the pickup and feed paper path (Tray 3 shown).
Figure 1-32   Tray 3 and Tray 4 pickup, feed, and delivery block diagram
Optional paper feeder
separation pad
Optional paper feederfeed roller
Optional paper feeder
pickup roller
42 Chapter 1   Theory of operation ENWW 
						

							Media level and size detection
●PS451; paper feeder media-presence sensor detects if media is present in the tray.
NOTE:
PS451 is used in Tray 3 and Tray 4.
●Media size is detected after the page enters the product. See Cassette paper size detection/
cassette paper detection on page 38
.
Jam detection
● PS8008; paper feeder media-feed sensor detects jams in the paper feeder.
ENWW Additional tray 43 
						

							44 Chapter 1   Theory of operationENWW 
						

							2 Removal and replacement
●Removal and replacement strategy
●
Service approach
●
Removal and replacement procedures
ENWW 45 
						

							Removal and replacement strategy 
General cautions during removal and replacement
This chapter describes the removal and replacement of field-replaceable units (FRUs) only.
Replacing FRUs is generally the reverse of removal. Occasionally, notes and tips are included to provide
directions for difficult or critical replacement procedures.
HP does not support repairing individual subassemblies or troubleshooting to the component level.
WARNING! Turn the product off, wait 5 seconds, and then remove the power cord before attempting
to service the product. If this warning is not followed, severe injury can result, in addition to damage to
the product. The power must be on for certain functional checks during troubleshooting. However,
disconnect the power supply during parts removal.
Never operate or service the product with the protective cover removed from the laser/scanner
assembly. The reflected beam, although invisible, can damage your eyes.
The sheet-metal parts can have sharp edges. Be careful when handling sheet-metal parts.
CAUTION: Do not bend or fold the flat flexible cables (FFCs) during removal or installation. Also, do
not straighten prefolds in the FFCs. You  must fully seat all FFCs in their connectors. Failure to fully seat
an FFC into a connector can cause a short circuit in a PCA.
Incorrectly routed or loose wire harnesses can interfere with other internal components and can become
damaged or broken. Frayed or pinched harness wires can be difficult to find. When replacing wire
harnesses, always use the provided wire loops, lance points, or wire-harness guides and retainers.
NOTE: To install a self-tapping screw, first turn it counterclockwise to align it with the thread pattern,
and then carefully turn it clockwise to tighten. Do not overtighten. If a self-tapping screw-hole becomes
stripped, repair the screw-hole or replace the affected assembly.
Note the length, diameter, color, type, and location of each screw. Be sure to return each screw to its
original location during reassembly.
TIP: For clarity, some photos in this chapter might show components removed that would not be
removed to service the product. If necessary, remove the components listed at the beginning of a
procedure before proceeding to service the product.
Electrostatic discharge
CAUTION: Some parts are sensitive to electrostatic discharge (ESD). Look for the ESD reminder
when removing product parts. Always perform service work at an ESD-protected workstation or mat, or
use an ESD strap. If an ESD workstation, mat, or strap is not available, ground yourself by touching the
sheet-metal chassis  before touching an ESD-sensitive part.
Protect the ESD-sensitive parts by placing them in ESD pouches when they are out of the product.
Required tools
● #2 Phillips 152 mm (6 in) screwdriver with magnetic tip
● #2 Phillips 76 mm (3 in) screwdriver with magnetic tip
● Small flat blade screwdriver
46 Chapter 2   Removal and replacement ENWW