HP Laserjet 5 Service Manual

6 - 48 Removal and Replacement 

7
Troubleshooting
Contents
General Troubleshooting Flowchart .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 7-3
Paper Path and Components .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 7-5
DC Controller Diagram .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 7-6
Printer Error Troubleshooting . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . . 7-7
Priority of Errors .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  . .  ....

7-2 Troubleshooting 

General Troubleshooting Flowchart
When the AC power isfirst appliedto the printer:
·Both the printer motor and the laser/scanner
motor rotate for 6 seconds.
·All of the LEDs illuminate for one second; the
“Ready” LED will illuminate after 3 seconds.
Ifno errormessage is displayed, the Printer Door
is firmly closed, and the toner cartridge is
installed, but the motor does NOT rotate when AC
power is applied to the printer:
1Verify that AC power is present at the input
power receptacle and that the power...

General Troubleshooting Flowchart (continued)
Refer to the section “Image Formation
Troubleshooting,” later in this chapter.
If the engine test produces a clear print image, yet
a Self Test is not generated by initiating the
Control Panel self-test procedure, replace the
Formatter PCA.
Perform an
Engine Test
Is the
Engine Test
image being printed
clearly
?
Perform a Front
Panel Self Test
Is the
Self Test image
being printed
clearly
?No
Yes
No
EXIT
Yes
7-4 Troubleshooting 

Paper Path and Components
Paper Path and Components
PS201PS203PS202 SL1MotorFeed Roller Feed
Sub
Roller Pick-up
Roller
Paper
Registration
SensorPaper
Out
Sensor Paper
Pick-up
Solenoid
Photo-
sensitive
Drum
Transfer
Roller Fuser
Paper
Exit Sensor Fusing Unit
Delivery
Roller Face-up
DeliveryDeflector
Face-down
Delivery
Face-down
Delivery
RollerManual
Input
SlotPaper
Input
Bin DC Controller PCA
PAPER DELIVERY SENSOR signal
(POSNS)
MOTOR DRIVE signal
(MA, /MA, MB, /MB)
PAPER PICK-UP SENSOR signal
(PISNS)...

DC Controller Diagram
DC Controller PCA Components
J3Control Panel Connector (Formatter
PCA)J202Paper Registration and Paper-Out
Photosensors (PS203 and PS202)
J102Fusing AssemblyJ206Fusing Assembly (thermistor feedback)
J201Formatter PCA ConnectionJ207Scanner Motor
J204Paper Pickup Solenoid (SL1)J208Laser Driver/Beam Detect Circuitry
J301Developer Bias ContactJ209Door Open/No Toner Cartridge
Photosensor (PS204) (HP LaserJet 5L
only)
J302Transfer Roller ContactJ401Motor
J304Primary Roller ContactFU101...

Printer Error Troubleshooting
Information regarding printer status is conveyed by two methods:  1) the printer’s
Control Panel lights and 2) feedback through the bi-directional I/O that displays at
the PC. The basic method of determining error messages uses patterns of lights on
the Control Panel LED. Printer messages are categorized into two basic types:
·Status Messages
·Service and Error Messages
NoteBefore troubleshooting the printer, cycle the power to the printer to see if the error
persists....

Printer Status Messages
The following table lists printer LED messages and their meanings and describes
recommended actions. For more information on the Front Panel layout, refer to
“Using the Control Panel” in Chapter 3, “Installation and Configuration.”
LEDs Description Recommended Action
Paper Out Error.
Door Open or No EP Cartridge.
Paper Jam.Add paper.
Close the printer door and/or verify that the EP
cartridge is installed.
Clear paper jam.
If you have completed these recommended actions
and the...

Occasionally you may add paper, close the printer door, add the toner cartridge, and
clear a paper jam, only to find that the printer still displays an error message. If this
happens, troubleshoot using Table 7-3 below.
NoteIf the error appears and persists only after you attempt to print a page, verify that
the motor is functioning. (See “Printing an Engine Test” later in this chapter.)
LEDs Description Recommended Action
Sleep ModeIf the printer’s LEDs remain off:
1. The printer is in Sleep Mode. Press...