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HP LaserJet 6p/mp Service Manual - Page 60

Formatter system, CPU, Read only memory (ROM), Random access memory (RAM), Parallel interface

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Formatter system The Formatter PCA is responsible for the following: l Receiving and processing print data from the printer interface. l Monitoring Control Panel Button and relaying printer status information. l Developing and coordinating data placement and timing with the print engine. l Storing font information. l Communicating with the host computer through the Bi-Directional Interface. The Formatter PCA receives print data from the Bi-Tronics Interface and converts it into a dot image. The DC Controller synchronizes the Image Formation System with the Paper Feed System and signals the Formatter to send the print image data. The Formatter sends the print image data (dots) in the form of a VIDEO signal and the printing process begins. On the HP LaserJet 5L and 6L, the Formatter PCA also provides mounting locations for additional memory. CPU The Formatter PCA incorporates a microprocessor operating at a minimum of 24 MHz. Read only memory (ROM) Besides storing microprocessor control programs, the ROM stores dot patterns of internal character sets (fonts). Random access memory (RAM) The RAM stores printing and downloaded font information received from the host system and temporarily stores a full page of print image data before the data is sent to the print engine. (See "Page Protect" later in this chapter.) For the HP LaserJet 5L and 6L printers, memory capacity can be increased by adding a DRAM memory card to the Formatter PCA. Note that adding memory may also increase print speed when printing complex graphics. The HP LaserJet 6L Pro does not support memory expansion or the use of a JEDIA card. Parallel interface The Formatter PCA receives incoming data through its Bi-Tronics interface. The Bi-Tronics I/O provides high speed and two-way communication between the printer and the host, allowing the user to change printer settings and monitor printer status from the host computer. This interface is IEEE1284 compliant. Control Panel Status LED lights The Formatter uses three LEDs mounted under the printer cover to communicate printer status to the user. Refer to "Using the Control Panel" in Chapter 3 and "Printer Error Troubleshooting" in Chapter 7 for more information on the lights. Control Panel Button The Control Panel Button is used for such functions as self test, reset, and to display error codes. Refer to "Using the Control Panel" in Chapter 3 for more information on the Control Panel Button. 58 Functional overview EN

Section	Page
Contents	7
Figures	11
Tables	13
Product information	15
Chapter contents	15
Printer features	16
Identification	17
HP LaserJet 6L Gold	17
Model and serial	17
Specifications	20
Product overview	21
Service approach	24
Parts Exchange Program	24
Ordering parts	24
Ordering related documentation	24
Contacting HP to place an order	24
Technical assistance	25
HPCustomer Care	25
HP worldwide sales and service offices	27
Warranty	30
Hardware service during the warranty period	30
Hardware service after the warranty period	30
HP LaserJet Toner Cartridge warranty	31
Voltage conversions	31
Site requirements	33
Chapter contents	33
Site requirements	34
Operating environment	34
Printer space requirements	35
The HP C3906A/F Toner Cartridge	36
Storage conditions	36
Storing opened toner cartridges	36
Toner cartridge handling suggestions	37
Operating overview	39
Chapter contents	39
Using the Control Panel	40
Control Panel layout	40
Indicator lights	40
The Control Panel Button	42
Printing a self-test page	43
Continuous self test	46
Printing an engine test	46
Resetting the printer	47
To reset the printer	47
Printer maintenance	49
Chapter contents	49
Life expectancy of consumables	50
Toner cartridge life	51
Saving toner with EconoMode	51
Refilled toner cartridges	52
Recycling toner cartridges	52
Cleaning the printer	53
Cleaning printer components	53
Cleaning spilled toner	54
Functional overview	55
Chapter contents	55
Basic printer functions	56
DC Controller/power system	57
Print engine control system	58
Power system (on DC Controller PCA)	58
Formatter system	60
CPU	60
Read only memory (ROM)	60
Random access memory (RAM)	60
Parallel interface	60
Control Panel	60
Resolution Enhancement technology (REt)	61
EconoMode	61
Memory Enhancement technology (MEt)	61
Enhanced I/O	61
Page Protect	62
PJL overview	62
Image formation system	63
Toner cartridge	63
Step 1: Drum cleaning	64
Step 2: Drum conditioning	64
Step 3: Image writing	64
Step 4: Image developing	64
Step 5: Image transferring	64
Step 6: Image fusing	64
Paper feed system	65
Paper jam detection	67
Basic sequence of operation	68
Removal and replacement	71
Chapter contents	71
Removal and replacement strategy	72
Required tools	73
Installing memory cards (DRAM)	74
Covers and doors	75
Back Cover	75
EP Door Assembly	77
Memory Door	78
Main Cover and Paper Input Assembly	79
Internal assemblies	80
Control Panel	80
Exit Roller Assembly	81
Delivery Assembly	82
Fuser Pressure Plate	84
Heating Element	86
Pressure Roller	89
Face-Up/Face-Down Lever	90
Fuser Exit Roller Assembly	91
Paper Exit Sensor Flag	92
Top assemblies	93
Laser/Scanner Assembly	93
Solenoid	94
Pickup Roller Assembly	96
Paper Feed Frame	99
Transfer Roller Guide and Transfer Roller	103
Kick Plate	104
Separation Pad	106
Subpads	107
Feed Assembly	108
Bottom assemblies	111
Memory Door Guide	111
Motor	112
DC Controller	113
Formatter PCA	116
Troubleshooting	117
Chapter contents	117
General troubleshooting flowchart	118
Paper path and components	120
DC Controller diagram	121
Printer error troubleshooting	122
Priority of errors	122
Printer status messages	123
Service and error messages	125
Image formation troubleshooting	128
Check the toner cartridge	128
Image defect examples	129
Troubleshooting checks	135
Engine test	135
Half self-test functional check	136
Drum rotation functional check	136
High-voltage power supply check	137
Paper curl	139
Troubleshooting tools	140
Paper path check	140
Repetitive image defect ruler	141
Main wiring diagram	142
Parts and diagrams	145
Chapter contents	145
How to use the part lists and diagrams	146
Ordering parts	146
Ordering consumables	146
Accessories and supplies	147
Common hardware	148
Parts diagrams	149
Parts index	169
Alphabetical parts list	169
Numerical parts list	174
Regulatory information	179
Laser Safety (U.S.)	179
Laser Statement (Finland)	180
Toner safety	181
Ozone emission	181
FCC Statement (Class B)	182
VCCI Statement (Japan)	182

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Functional overview

Formatter system

The Formatter PCA is responsible for the following:

Receiving and processing print data from the printer interface.

Monitoring Control Panel Button and relaying printer status information.

Developing and coordinating data placement and timing with the print engine.

Storing font information.

Communicating with the host computer through the Bi-Directional Interface.

The Formatter PCA receives print data from the Bi-Tronics Interface and converts it into a dot image.

The DC Controller synchronizes the Image Formation System with the Paper Feed System and

signals the Formatter to send the print image data. The Formatter sends the print image data (dots)

in the form of a VIDEO signal and the printing process begins.

On the HP LaserJet 5L and 6L, the Formatter PCA also provides mounting locations for additional

memory.

CPU

The Formatter PCA incorporates a microprocessor operating at a minimum of 24 MHz.

Read only memory (ROM)

Besides storing microprocessor control programs, the ROM stores dot patterns of internal character

sets (fonts).

Random access memory (RAM)

The RAM stores printing and downloaded font information received from the host system and

temporarily stores a full page of print image data before the data is sent to the print engine. (See

“Page Protect” later in this chapter.) For the HP LaserJet 5L and 6L printers, memory capacity can be

increased by adding a DRAM memory card to the Formatter PCA. Note that adding memory may

also increase print speed when printing complex graphics. The HP LaserJet 6L Pro does not support

memory expansion or the use of a JEDIA card.

Parallel interface

The Formatter PCA receives incoming data through its Bi-Tronics interface. The Bi-Tronics I/O

provides high speed and two-way communication between the printer and the host, allowing the user

to change printer settings and monitor printer status from the host computer. This interface is IEEE-

1284 compliant.

Control Panel

Status LED lights

The Formatter uses three LEDs mounted under the printer cover to communicate printer status to the

user. Refer to “Using the Control Panel” in Chapter 3 and “Printer Error Troubleshooting” in Chapter 7

for more information on the lights.

Control Panel Button

The Control Panel Button is used for such functions as self test, reset, and to display error codes.

Refer to “Using the Control Panel” in Chapter 3 for more information on the Control Panel Button.