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Service Tests and Adjustments
This topic discusses using the front panel's interactive mode to review and change the printer's operation. It also contains the procedures to test and calibrate the printer after you replace key Field Replaceable Units and to evaluate the printer's functionality.
Required tools
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Magnifying lens (preferably illuminating) Phillips screwdriver
Service Guide
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Printing test prints
The prints printed via the front panel are generated by the image processor. While the printer is idle you can use the front panel to print an image stored in the image processor such as the Configuration Page.
Print service test prints
The service prints allow you to evaluate the printer's print quality. Service Print 1 is four pages of 25% tint primary color fills and one page of all for colors at 25% fill. Service Print 2 prints a 600 and 1200 dpi test pattern as well as a solid-fill red print.
1. Press the Menu button. 2. With the Help pages menu displayed, scroll to the Service Print 1 or
Service Print 2 menu item. Press Print.
Printing the Configuration Page
The configuration page shows a great deal of information regarding the data and setup values stored in NVRAM. In the same Help pages menu you can also print the startup page.
1. Press the Menu button. 2. With the Help pages menu displayed, scroll to the Configuration Page
menu item. Press Print.
Printing the demonstration pages
Demo pages demonstrate the capabilities of the printer.
1. Press the Menu button. 2. With the Help pages menu displayed, scroll to the Demonstration Page
item. Press Print.
Printing the print engine's test print
The print engine can print a test print independent of the image processor. The print is a composite gray fill composed of cyan, magenta and yellow toner. No black toner is used in the print.
1. Press and hold for 4 seconds the Test Print button in the center of the upper
rear cover. This verifies the print engine's ability to print independent of the image processor. Do not use this print to verify print quality. Since the print engine defaults to the top tray as a paper source, the Test Print function will not work with the auto-duplex unit installed.
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Phaser 740 Color Printer
Printer self-diagnostics
The printer's image processor features four types of self-test modes. The type of selftests run depend upon which front panel buttons are pressed while the printer is turned on. The button combinations are listed here.
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Turning on the printer or restarting the printer remotely executes normal image processor power-up self-tests and then, if the tests pass, proceed to launch its PostScript interpreter. Pressing and holding Button 3, as you turn on the printer, executes interactive service test with the image processor board and the print engine. Pressing and holding Button 1 and 4, as you turn on the printer, allows you to reset the NVRAM to its factory-default values. Refer to the later topic, "Resetting NVRAM" on page 67. This also reset the NVRAM of an installed network card.
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Service tests
Service tests provide the means to test and check the printer's electro-mechanical components and sensors, test the paper path, calibrate the margins, test RAM and check for engine errors. Start service tests by pressing and holding Button 3 (third button from left) while turning on the printer. When the message "Service Diagnostics" appears on the front panel, release button 3. Using the Prev and Next button, scroll to the desired test. Press the Start button to execute the test. Some of the test have sub-menus you must navigate in a similar fashion. Use the Exit button to stop a test as well as return to the main menu. To exit Service test mode turn the printer off and on.
Print engine service test descriptions
Category Image processor Test Kernel Subtest CPU Interrupt Bridge BootROM checksum NVRAM Ack IROM Checksum DIMM 1 Data DIMM 1 Address DIMM 2 Data DIMM Address RTC Font ROM Checksum NVRAM Read/Write Ethernet Read/Write SCSI Interrupt SCSI Reg Read/Write Centronics Interrupt Centronics Read/Write Ethernet Read/Write
Memory
I/O
Service Guide
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Engine
Set Margins
Paper Path
Sensors
Motor Tests
Clutches
Top Margin Front Margin Back Left Margin Top Tray Middle Tray Multi-purpose Tray Bottom Tray Fr./Rt. Door Left Access Door Lower Feeder Door Fuser Installed Fuser Roll Installed Fuser Roll (New/used) Imaging Unit Installed Accumulator Belt Tension Charger Unit Installed IUT Position Multi-purpose Tray` Media Multi-purpose Tray Pick Position Registration Roller Fuser Exit Paper Exit Output Tray Auto-duplex Jam Auto-duplex Gate Main Motor Paper Feed Motor Cartridge Motor Laser Motor Lower Feeder Motor Filter Fan Power Supply Fan Fuser Fan Auto-duplex Unit Fan Multi-purpose Tray Motor Black Cam Motor/sensor Yellow Cam Motor/sensor Magenta Cam Motor/sensor Cyan Cam Motor/sensor Black Cam Motor/sensor Black Cartridge Clutch Yellow Cartridge Clutch Magenta Cartridge Clutch Cyan Cartridge Clutch Registration Clutch Auto-duplex Unit Clutch
Top Tray Paper Top Tray Sw1 Top Tray Sw 2 Top Tray Sw3 Middle Tray Paper Middle Tray Sw1` Middle Tray Sw2 Middle Tray Sw3 Bottom Tray Paper Bottom Tray Sw1 Bottom Tray Sw2 Bottom Tray Sw3 Black Cart Installed Cyan Cart Installed Magenta Installed Yellow Installed
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Phaser 740 Color Printer
Engine (cont.)
Solenoids
Command Engine
Misc. Tests
Maintenance
Engine Status General Status
Help
Transfer Roller Solenoid Cleaning Blade Solenoid Face Up/down Solenoid Top Pick Solenoid Middle Pick Solenoid Bottom Pick Solenoid Fuser Roll Solenoid Auto Duplex Unit Bypass Solenoid Main Motor On/off Yellow Roller On/off Paper Feed Motor On/off Cyan Roller On/off Cartridge Motor On/off Magent Roller On/off Laser Motor On/off Registration Clutch Lower Feeder Motor On/off Paper To Auto Duplex Multi-pur Tray Motor On/off Auto-dup Pick Clutch High Voltage Supply On/off Top Pick Roller Erase Lamp On/off Middle Pick Roller All Fans On/off Bottom Pick Roller Paper To Exit Transfer Roller Black Cam On/Off Cleaning Blade Yellow Cam On/Off Face Up/Dn Sole. Cyan Cam On/Off Fuser Roll Advan Sol Magenta Cam On/Off Blow New Fuser Roll Black Roller On/Off Main Motor On Erase Lamp HHS Laser Scanner Seal Energy Star Clean Accumulator Belt Clean Top Pick Rollers Clean Middle Pick Rollers Clean Bottom Pick Rollers Clean Multi-purpose Tray Pick Rollers Status 1 Thru 49 Hex Codes - Engineering Use OnlyStatus: Top Tray: Middle Tray: Bottom Tray: Engine Control Board ROM Version: Fuser Temperature: Ambient Humidity: Ambient Temperature: Turn Help On/off For Each Image Processor And Engine Menu
Service Guide
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Print engine calibration
Generally, no print engine calibration is required. Usually, if you note a print defect, replacing a toner cartridge, the imaging unit or the transfer roller (or perhaps the paper feeder) corrects the problem.
Printer color correction
Correcting printer colors is accomplished manually. You use front panel menus to make the corrections.
Manually setting color corrections
1. Press the Menu button on the front panel to scroll the Calibrate Colors
menu.
2. Press the right arrow to scroll to the Adjust each color menu item. Press
Menu to enter the Adjust each color menu.
3. Press Print to print a reference print showing the printer's current
selections for each primary color. The currently selected colors are oriented through the midline of the page with the alternate choices extended above and below them.
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Phaser 740 Color Printer
Color Reference Page
Cyan
-4
Magenta
-6
Yellow
Black
-2
-4
-9
0
-9
-2
-7
+2
-7
0
-5
+4
-5
+2
-3
+6
-3
+4
-1
+8
-1
+6
+1
+10
+1
+8
+3
+3
+10
+5
+5
+7
+7
+9
9698-18
Manual color correction reference print 4. Overlay and compare the pre-printed primary Color Density Samples in the
Phaser 740 Color Printer User Guide to the selected colors on the midline of the print. If any primary color does not match, overlay and compare to an alternate color. Note the number, -10 to +10, referenced to the alternate choice.
5. Press the right arrow on the front panel to scroll to the Adjust :+0
menu for the primary color you wish to change.
6. Press the arrow keys to increment the displayed value (from -10 to +10) to
match the alternate color selected from the reference print. Then press OK. An "*" indicates the selected value.
7. Repeat Step 4 through 6 for any other color that needs adjustment. 8. Press Exit to leave the Color Calibration menus.
Service Guide
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Phaser 740 Color Printer