36 SfcLF i ESTS General

Three types of self-test routines, other than Service Mode tests covered in the next section, can be performed on the HP 33440 and HP 33449 printers. These self-test routines are 15 ENGINE TEST (Test Print). Each time the printer is powered on or the Control Panel (print fonts test) key is held down for 2-to-5 seconds, 05 SELF TEST is displayed. (If the key is held down longer, 04 SELF TEST will be displayed.) The printer will then execute a self test that verifies operation in the following...

Manual Feed Sensor PS302 Functional Check

To check the operation of PS302 (the Manual Feed sensor) via the Control Panel display, proceed as follows 1. After powering up the printer with 00 READY in the display, change menu item MANUAL FEED to ON and PAPER to LETTER (HP 33449 only). (On the HP 33440, remember to toggle through the remaining menu items, then hold down the continue reset) key until 07 RESET appears in the display in order for the menu change to take effect.) The MANUAL indicator should now be ON. 2. Take the printer off...

Laser Safety

The both printers are certified as Class 1 laser products under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safely Act of 1968. This means that they do not produce hazardous laser radiation. Both printers also comply with the Center for Devices and Radiological Health (CDRH) regulations. Since laser light emitted inside the printer is completely confined within protective housings and external covers...

55 Interface System General

425dn Formatter Block Diagram

For both the HP 33440 (Interface PCA) and HP 33449 (Formatter PCA), the Interface Formatter PCA is responsible for the following Communicating with the host system, either through the standard serial or parallel ports or through the optional I O interface, if installed. Monitoring operator interface via the printer's Control Panel and displaying printer status information to the operator. Communicating with the print engine (DC Controller PCA). Storing configuration information. Manipulating...

Page Protection HP 33449 Only

For Page Protection to appear as a Configuration Menu option, at least 1 Mbyte of optional memory must be installed. A page's complexity (rules, vector graphics, or dense text) may exceed the printer's ability to create an image and keep pace with the engine printing process. If a page is too complex, the page might print in parts or only part of the page might print. In such cases, a 21 PRINT OVERRUN message (signifying possible loss of print data) will appear in the display. Page Protection...

51 Error Message

Two displays, 41 ERROR and 51 ERROR, indicate a laser beam detect problem. The 41 ERROR is displayed when the beam is lost for less than 2 seconds. An error condition of greater than 2 seconds will result in a 51 ERROR message. A 41 ERROR (temporary Beam Detect Error) may occur during laser scanning operation. This error results when the beam detect signal falls outside the timing window established by the DC Controller PCA. If this situation occurs longer than an interval of two seconds, a 51...

HP 33440HP 33449 Combined Service Manual Dc Controller Signal Listing Chart HP 33440 and HP 33449

LED 201 and SW201, 202, 203, and 205 Table 7-52. LED 201 and SW201, 202, 203, and 205 Right paper tray size switch. Middle paper tray size switch. Left paper tray size switch. Bottom cover is installed (Thermistor Bypass Switch). Beam Detect indicates the beginning of a raster scan line. Photodiode sensitivity adjustment bias. Photodiode feedback signal to indicate laser beam power. Laser diode current source, modulated by the video signal from the Interface Formatter PCA. Scanner...

74 Prater Message Troubleshooting Message Summary Table

Table 7-2, Printer Messages, is a list of all status, attendance, error, and service messages affecting the HP 33440 and HP 33449 printers. HP 33449-specific messages are overprinted in color. When two items appear in the MESSAGE column, the first is the HP 33440 display message and the second is the HP 33449 display message. This list identifies the action required to correct the situation identified by the message. SITUATION DESCRIBED AND OR ACTION REQUIRED Refer to Blank Display section....

75 Image Formation Troubleshooting

The quality of the printer's output is always subject to the judgment of the particular user. This section of the manual is intended to assist the service representative in defining print quality and understanding what factors may affect print quality. The print samples depicted in Figure 7-24 illustrate some print quality defects and their possible causes. It is impossible to illustrate all possible print quality defects since there are too many variables in the printing process. It is...

Paper Jam Detection

Any paper movement problem normally results in a paper jam indication. All paper jam detection centers around the Paper Exit Sensor PS331 on the Thermistor Exit Sensor PCA being interrupted by the Exit Sensing Arm photointerrupter on the Fusing Assembly. This sensor detects the presence or absence of paper and inputs this information to the main DC Controller microprocessor where it is stored in memory. From this information, the microprocessor determines when a paper jam has occurred. The...

Paper Feed Mechanical Checks

The purpose of solenoid SL301 is to allow the Paper Pickup Roller to pick one sheet of paper from either the paper tray or the manual feed tray and advance the paper to the Registration Rollers. Since the Registration Rollers are not turning at this time, the paper will be bowed slightly as it enters the Registration Rollers see Figure 7-11 . Paper pickup operation is initiated by the DC Controller's main microprocessor. The Cassette Pickup Drive CPUD signal from the microprocessor energizes...

50 Service Fuser Malfunction

The purpose of the fusing system is to maintain a constant temperature on the Fusing Roller so that the toner image is permanently fused to the paper. A high intensity fusing lamp, located in the center of the Fusing Roller, provides the high temperature required for the fusing process. While the printer is in standby mode, a temperature of 165 C is maintained on the Fusing Roller. While the printer is in printing mode, a temperature of 180 C is maintained. The main components of the fusing...

Block Diagrams Deskjet And Laser

Deskjet Printer Block Dig

IMAGE FORMATION SYSTEM 5-4 5-4 Photosensitive Drum 5-5 CLEANING Stage One 5-6 CONDITIONING Stage Two 5-7 WRITING Stage Three 5-8 DEVELOPING Stage TRANSFER Stage FUSING Stage 5-3. PAPER PICKUP FEED Paper Path Manual Paper Jam Main Drive 5-4. MACHINE CONTROL 5-5. INTERFACE General . Descriptions of Blocks in the HP 33440 Interface PCA Diagram 5-17 CPU Central Processing ROM Read-Only Memory NVRAM Non-Volatile Random Access SRAM Static Random Access Address DRAM Dynamic...

42 Life Expectancy Of Consumables And Related Parts

The expected service live of consumables and related parts is given in Table 4-1. Always inspect these components for wear when servicing the printer. The expected-service-life estimates are based on A4 or letter size prints with an average of 5 percent toner coverage at a density dial setting of 7. The control panel self test printout produces approximately a 12 percent coverage for the HP 33440, 10 percent for the HP 33449. Table 4-1. Service Life of Consumables Table 4-1. Service Life of...

24B Vdc Functional Check

For an explanation of the source of the 24B Vdc power, read the overview for the 12 PRINTER OPEN message on the previous page. To verify if the 24B Vdc power supply is functional, proceed as follows 1. Remove the access cover s to the test connector J210, next to the Test Print Button . 2. Using a voltmeter with frame ground as a reference, monitor the voltage at J210-11 while manually activating the printer Top Cover Assembly closed microswitch see Figure 7-6 and Figure 7-7 . The measured...

Features Which Apply Only to the HP 33449

Memory Provides 1 Mbyte of total internal read write memory with the capability to increase memory by the addition of 1, 2, 3, or 4 Mbytes, through two expansion slots, up to a total of 5 Mbytes. Font Handling Provides all the features of the HP 33440 as well as font scaling capability for generating fonts of any desired size from 4 to 999.75 points in quarter-point increments and autorotation for fonts and raster graphics. Print images are rotated automatically as the page orientation is...