"惠普M208M232M233原理和故障诊断维修手册：故障排除和维修指南"

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The HP M208M232M233 Troubleshooting Manual is an essential resource for understanding the principles and diagnosing maintenance issues for a range of HP LaserJet printers and multifunctional products. This comprehensive manual covers the M208dw, M209dw/dwe, M211d/dw, M232dw/dwc, M233dw, M234dw/dwe, M236d/dw, M233sdn/sdw, M234sdn/sdne/sdw/sdwe, HP LaserJet M207-M212 series, M207e-M212e series, and HP LaserJet MFP M232-M237 series, and M232e-M237e series. The Troubleshooting Manual provides detailed information on printer part removal, part number information, and step-by-step troubleshooting procedures for identifying and resolving technical issues. It is a valuable asset for IT professionals, service technicians, and anyone responsible for the maintenance and repair of HP printers and MFPs. The manual is available in English and is published by HP Development Company, L.P. The copyright and license information clearly stipulates that reproduction, adaptation, or translation of the manual without prior written consent from HP is prohibited, ensuring the protection of HP's intellectual property rights. Overall, the HP M208M232M233 Troubleshooting Manual is a comprehensive and authoritative guide that is indispensable for anyone involved in the maintenance and repair of HP printers and multifunctional products. It provides detailed insights into the principles and technical aspects of the products, along with practical guidance for diagnosing and resolving maintenance issues, making it an invaluable resource for ensuring the optimal performance and longevity of HP printing equipment.

Sequence of operation

The DC controller PCA controls the operating sequence of the printer, as described in the following table:

Table 1-1 Sequence of operation

Period Duration Description

Waiting From the time the power is turned on, the door is

closed, or when the printer exits sleep mode until the

printer is ready for printing.

● Heats the fuser lm in the fuser

● Detects the toner cartridge presence

● Detects the service fuser

● Rotates and stops the main motor

● Cleans the transfer roller

Standby From the end of the waiting sequence or the last

rotation until the formatter receives a print command,

or until the printer is turned o.

● Remains in the print-ready state

● Enters active OFF or inactive OFF mode if a

power control mode designation command is

sent

Initial rotation From the time the formatter receives a print command

until the paper enters the paper path.

● Rotates the main motor

● Activates the high-voltage power supply (high-

voltage bias)

● Prepares the laser scanner unit

● Warms the fuser to the correct temperature

Printing From the time the rst sheet of paper enters the paper

path until the last sheet passes through the fuser.

● Forms the image on the photosensitive drum

● Transfers the toner to the paper

● Fuses the toner image onto the paper

Last rotation From the time the last sheet of paper exits the fuser

until the motors stop rotating.

● Stops the main motor

● Stops the high-voltage power supply (high-

voltage bias)

● Stops the laser scanner unit

● Stops the fuser heater

● If another print command is received, the printer

enters the initial rotation period when the last

rotation is complete.

4 Chapter 1 Theory of operation ENWW

Formatter-control system

●

Sleep delay

●

Printer job language (PJL)

●

Printer management language (PML)

●

Control panel

●

Wireless

●

Low-end data model (LEDM) overview

●

Advanced-control language (ACL) overview

●

CPU

●

Input/output (I/O)

The formatter performs the following functions:

● Controls the sleep delay function

● Receives and processes print data from the various printer inputs

● Monitors control panel functions and relays printer status information (through the control panel and

the bidirectional input/output)

● Develops and coordinates data placement and timing with the DC controller

● Communicates with the host computer through the network or the bidirectional interface

The formatter receives a print job from the network or bidirectional interface and separates it into image

information and instructions that control the printing process. The DC controller synchronizes the image

formation system with the paper input and output systems, and then signals the formatter to send the print

image data.

Sleep delay

When the printer is in sleep delay mode, the control panel backlight is turned o, but the printer retains all

printer settings, downloaded fonts, and macros. The default setting is a 1-minute idle time. The setting can

be changed or turned o from EWS.

The printer exits sleep delay mode, and then enters the warm-up cycle when any of the following occurs:

● A print job, valid data, or a PML or PJL command is received at the serial port.

● The control panel is touched (button press depending on model).

● A document is loaded in the document feeder or the scanner lid is opened (MFP models only).

TIP: Error messages override the sleep delay message. The printer enters sleep mode at the appropriate

time, but the error message continues to appear.

Printer job language (PJL)

PJL is an integral part of printer conguration, in addition to the printer control language (PCL) and PostScript

(PS). With standard cabling, the printer can use PJL to perform a variety of functions.

ENWW Formatter-control system 5

● Dynamic I/O switching: The printer can be congured with a host on each I/O by using dynamic I/O

switching. Even when the printer is oine, it can receive data from more than one I/O simultaneously,

until the I/O buer is full.

● Context-sensitive switching: The printer can automatically recognize the personality (PS or PCL) of

each job and congure itself to serve that personality.

● Isolation of print environment settings from one print job to the next: For example, if a print job is

sent to the printer in landscape mode, the subsequent print jobs print in landscape only if they are

formatted for landscape printing.

Printer management language (PML)

PML allows remote conguration of the printer and status monitoring through the input/output (I/O) ports.

Control panel

The formatter sends and receives printer status and command data to and from the control panel.

Wireless

NOTE: Wireless models only.

Wireless products contain a wireless card to enable 802.11b/g/n wireless communication.

Low-end data model (LEDM) overview

The low-end data model (LEDM) provides one consistent data representation method and denes the

dynamic and capabilities tickets shared between clients and devices, as well as the access protocol, event,

security, and discovery methods.

Advanced-control language (ACL) overview

The advanced control language (ACL) is a language that supports printer control and rmware downloads in

printers that support both PJL/PCL and host-based printing. Each sequence of ACL commands must be

preceded by a unied exit command (UEL) and an @PJL ENTER LANGUAGE=ACL command. The ACL sequence

is always followed by a UEL. Any number of commands can be placed between the UELs. The only exception to

these rules is the download command. If a rmware download is done, the download command must be the

last command in the sequence. It will not be followed by a UEL.

The rmware searches for the UEL sequence when parsing commands. However, while downloading binary

data such as host-based code or NVRAM data, the rmware suspends UEL parsing. To handle hosts that

“disappear” during binary sequences, the rmware times out all ACL command sessions. If a timeout occurs

during a non-download command sequence, it is treated as the receipt of a UEL. If a timeout occurs during

rmware download, the printer resets.

CPU

The formatter incorporates an 500 MHz processor.

Input/output (I/O)

The following sections discuss the input and output features of the printer:

6 Chapter 1 Theory of operation ENWW

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