Oki MB780 User manual

MB 780 / MB790
Service Guide
© 2010 OkiData Americas, Inc.
Disclaimer
Every effort has been made to ensure that the information in this document is complete, accurate, and up to date. The manufacturer
assumes no responsibility for the results of errors beyond its control. While all reasonable efforts have been made to make this document
accurate and helpful as possible, we make no warranty of any kind, expressed or implied, as to the accuracy or completeness of the
information contained herein. For the most up-to-date service information available, visit our website at www.okidata.com © Okidata
Americas, Inc. 2010
1

Contents
Accessing the Service Menus Page 4
Available Diagnostic Menu Tests Page 6
REGISTRATION Page9
PRINTTESTS Page12
HARDWARE TESTS Page 14
DUPLEXTESTS Page16
INPUT TRAY TESTS Page 19
OUTPUT BIN TESTS Page 20
BASE SENSOR TEST Page 21
DEVICE TESTS Page 22
PRINTERSETUP Page23
EPSETUP Page25
REPORTS Page26
EVENTLOG Page27
SCANNERTESTS Page28
Available Configuration Menus Page 30
Maintenance Counter Value Page 31
Reset Maintenance Counter Page 31
USB Scan to Local Page 31
Print Quality Pages Page 32
Reports – Menu Settings Page 32
Reports – Event Log Page 33
Size Sensing Page 33
PanelMenus Page34
PPDS Emulation Page 34
2

Factory Defaults Page 34
Energy Conserve Page 35
Min Copy Memory Page 35
NumPad Job Assist Page 35
Format Fax Storage Page 35
Fax Storage Location Page 36
ADF Edge Erase Page 36
FB Edge Erase Page 36
Scanner Manual Registration Page 37
DisableScanner Page38
Paper Prompts Page 38
Envelope Prompts Page 38
Action for Prompts Page 38
Jobs On Disk Page 39
Disk Encryption Page 39
Wipe Disk Page 40
Font Sharpening Page 40
Require Standby Page 40
LES Applications Page 40
Key Repeat Initial Delay Page 41
Key Repeat Rate Page 41
Wiper Message Page 41
Clear Custom Status Page 41
3

Accessing the Service Menus
There are different test menus that can be accessed during POR to identify problems with
the printer.
Pages 5 & 29
Page 5
4

Accessing the Diagnostics Menu
Entering Diagnostics Menu
1. Turn off the printer.
2. Press and hold 3 and 6 buttons simultaneously.
3. Turn on the printer.
4. Release the buttons after 10 seconds.
Exiting Diagnostics Menu
Touch Exit Diag Menu to exit the Diagnostics Menu, “Resetting the Printer” will be
displayed. The printer perform Exit
Diag Menu
Accessing the Configuration Menu
Entering Configuration Menu
5. Turn off the printer.
6. Press and hold 2 and 6 buttons simultaneously.
7. Turn on the printer.
8. Release the buttons after 10 seconds.
Exiting Configuration Menu
Touch Exit Config Menu to exit the Configuration Menu, “Resetting the Printer” will be
displayed. The printer performs a POR, and the printer returns to ready mode.
Exit
Config Menu
5

Available Diagnostic Menu Tests
The tests display on the operator panel in the order shown:
Note: Some menus are not available, depending on the configuration of the printer.
REGISTRATION See “Registration (printer)” on page 9
Top Margin
Bottom Margin
Left Margin
Right Margin
Quick Test See “Quick Test” on page 10
PRINT TESTS
Tray 1 See “Input source tests” on page 12
Tray 2 (if installed)
Tray 3 (if installed)
Tray 4 (if installed)
Tray 5 (if installed)
MP Feeder
Envelopes - MP Feeder (if installed)
Printing Print Quality Pages See “Printing Quality Pages” on page 12
HARDWARE TESTS
Panel Test See “Panel Test” on page 14
Button Test See “Button Test” on page 14
DRAM Test See “DRAM Test” on page 14
USB HS Test Mode
6

Diagnostics Menu tests (continued)
DUPLEX TESTS (if installed)
Quick Test See “Quick Test (duplex)” on page 16
Top Margin See “Top Margin (duplex)” on page 16
Sensor Test See “Sensor Test (duplex)” on page 17
Motor Test See “Motor Test (duplex)” on page 17
Duplex Feed 1 See “Duplex Feed 1” on page 17
Duplex Feed 2 See “Duplex Feed 2” on page 18
INPUT TRAY TESTS
Feed Tests See “Feed Tests (input tray)” on page 19
Tray 1
Tray 2 (if installed)
Tray 3 (if installed)
Tray 4 (if installed)
Tray 5 (if installed)
Envelope Feeder
MP Feeder
Sensor Tests See “Sensor Test (input tray)” on page 19
Tray 1
Tray 2 (if installed)
Tray 3 (if installed)
Tray 4 (if installed)
Tray 5 (if installed)
Envelope Feeder
MP Feeder
OUTPUT BIN TESTS See “OUTPUT BIN TESTS” on page 20
Feed Tests
Standard Bin
Sensor Tests
Standard Bin
BASE SENSOR TEST See “BASE SENSOR TEST” on page 21
Toner Sensor
Input Sensor
Output Sensor
Narrow Media
Front Door
DEVICE TESTS
Quick Disk Test See “Quick Disk Test” on page 22
Disk Test/Clean See “Disk Test/Clean” on page 22
7

Diagnostics Menu tests (continued)
PRINTER SETUP
Defaults See “Defaults” on page 23
Printed Page Count See “Printed Page Count” on page 23
Perm Page Count See “Permanent Page Count” on page 23
Serial Number See “Serial Number” on page 23
Envelope Enhance See “Engine Settings 1 through 16” on page 23
Engine Settings 1 through 16 See “Engine Settings 1 through 16” on page 23
Model Name See “Model Name” on page 23
Configuration ID See “Configuration ID” on page 24
Edge To Edge See “Edge to Edge” on page 24
Enable Edge to Edge Copy See “Enable Edge to Edge Copy” on page 24
EP SETUP
EP Defaults See “EP Defaults” on page 25
Fuser Temp See “Fuser Temperature (Fuser Temp)” on page 25
Fuser Page Count See “Fuser Page Count” on page 25
Warm Up Time See “Warm Up Time” on page 25
Transfer See “Transfer” on page 26
Print Contrast See “Print Contrast” on page 26
Charge Roll See “Charge Roll” on page 26
Gap Adjust See “Gap Adjust” on page 26
Auto Dark Adjust See “Auto Dark Adjust” on page 26
REPORTS
Menu Settings Page See “Menu Settings Page” on page 26
EVENT LOG
Display Log See “Display Log” on page 27
Print Log See “Print Log” on page 27
Clear Log See “Clear Log” on page 27
SCANNER TESTS
Back Side Scan Uniformity See “Back Side Scan Uniformity” on page 28
ASIC Test See “Back Side Scan Uniformity” on page 28
Feed test See “Feed Test” on page 28
Sensor Tests See “Sensor Tests” on page 28
8

REGISTRATION (printer)
Previous Print registration makes sure the printing is properly aligned on the page.
The settings available are:
Description Value Direction of change
Top Margin -25 to +25 Each increment
causes approximately 4 pels
shift (at600 dpi).
A positive change moves the image down the page and
increases the top margin. A negative change moves the
image up and decreases the top margin.
Bottom
Margin
-20 to +20 Each increment
causes approximately 0.55
mm shift in the bottom
margin.
A positive change compresses the image so it appears to
move down the page, and a negative change moves the
image up.
Left Margin -25 to +25 A positive change moves the image right, and a negative
change moves the image left. No compression occurs.
Right
Margin
-10 to +10 A positive change moves the image left, and a negative
change moves the image right.
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To set print registration:
1. Print the Quick Test page.
2. Touch REGISTRATION from the Diagnostics Menu.
3. Touch to select Quick Test. You may need to scroll to the next page.
Retain this page to determine the changes you need to make to the margins settings.
The diamonds in the margins should touch the margins of the page.
To change the value of any of the margin settings:
•Touch to the right of the appropriate margin setting. The panel displays the
setting's name in the header and ◄[setting's current value] ►in a menu below
the header row.
•Touch ◄to decrease the value or ►to increase the value.
•Touch Submit to save the change, or Touch Back to cancel and return to the
Diagnostics Menu.
•Touch Submit to save all changed values.
The device prints a Quick Test page from the appropriate paper tray. While the
Quick Test page prints, Printing Alignment Page appears on the LCD.
Quick Test
The Quick Test contains the following information:
•Device information
•Printer margin settings
•Scanner margin settings
•Alignment diamonds at the top, bottom, and each side.
•Horizontal lines for skew adjustment
•General printer information, including current page count, installed memory,
processor speed, serial number, Engine ID, and system card ID.
10

To print the Quick Test page:
Note: Print the Quick Test Page on letter or A4 paper.
•Touch REGISTRATION from the Diagnostics Menu.
•Touch to select Quick Test.
The message Quick Test Printing… appears on the display. Once the Quick Test
Page completes printing, the Registration screen displays again.
•Touch Back to return to the Diagnostics Menu.
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PRINT TESTS
Selections on the screen vary since only installed input sources are listed, followed by
Printing Quality Test Pages.
Input source tests
The purpose of the diagnostic Print Tests is to verify that the printer can print on media
from each of the installed input options. The contents of the Print Test Page will vary
depending on the media installed in the selected input source.
Check each Test Page from each source to assist in print quality and paper feed problems.
To run the Print Test Page:
1. Select PRINT TESTS from the Diagnostics menu.
2. Select the media source to test:
Tray 1
Tray 2 (if installed)
Tray 3 (if installed)
Tray 4 (if installed)
Tray 5 (if installed)
MP Feeder (if installed)
Envelope Feeder (if installed)
3. Select Single or Continuous.
•If Single is selected, a single page is printed.
•If Continuous is selected, printing continues until Stop is pressed to cancel the test.
•If a source is selected that contains envelopes, an envelope test pattern is printed.
•If Continuous is selected, the test pattern is printed only on the first envelope.
Note: The Print Test Page always prints on one side of the paper, regardless of the duplex
setting or the presence of a duplex option
Touch Back to return to PRINT TESTS.
Printing Quality Pages
The purpose of this diagnostic function is to allow printing of the print quality test pages
with the toner cartridge lockout function disabled. The print quality pages consist of four
pages. Page one contains a mixture of graphics and text. Page two is gray with two one-
inch black squares located on the bottom right. Page three is a solid black page and page
four is blank. If duplex is turned on, the pages are duplexed. The Print Quality Test pages
are printed in English and must always be printed on letter, legal, or A4 paper.
To run the Print Quality Test Pages, touch beside Printing Quality Test Pages from
PRINT TESTS. The message “Printing Quality Test Pages” is displayed.
Note: The print quality test pages can also be printed from the Configuration menu
(CONFIG MENU), however, a cartridge must be installed with a machine class ID
matching the machine class ID stored in NVRAM. Additional diagnostic information
may be printed on the pages when printing from DIAGNOSTICS.
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The following is included in the DIAGNOSTICS version of the print quality pages:
•Values from EP SETUP in DIAGNOSTICS, including:
Fuser temperature, warm-up time, transfer, print contrast, charge roll
settings and gap adjust.
•Contents of the EVENT LOG from DIAGNOSTICS.
•Configuration information, including printer serial number, controller
code level, engine code level, operator Next panel code level, font
versions, and cartridge information.
•Default values for the QUALITY MENU settings used to print the pages.
13

HARDWARE TESTS
Select the following Hardware Tests from this menu:
•Panel Test
•Button Test
•DRAM Test
•USB HS Test Mode
Panel Test
This test automatically toggles each pixel of the touch screen through every contrast level
beginning with the darkest and on to the brightest. This test continues until you press Stop
Button Test
The Button Test verifies the operation of the buttons on the operator panel. When you
select Button Test, a diagram of the operator panel appears on the panel. When you press
a button on the operator panel, the corresponding touch screen key is emphasized. Touch
Back to cancel the test.
DRAM Test
The purpose of this test is to check the validity of DRAM memory, both standard and
optional. The test writes patterns of data to DRAM to verify that each bit in memory can
be set and read correctly.
To run the DRAM Test:
•Touch to select DRAM Test from the menu.
The message DRAM Test Testing… displays. Then the message “Resetting Printer”
appears, and the power indicator light blinks red.
•Turn the printer off and on. While the DRAM test executes, the power indicator
blinks green. The following type of message appears:
DRAM Test <### P:###### F:####
•xxx represents the installed DRAM size.
•P:###### represents the number of times the memory test has passed and finished
successfully. Initially 000000 displays with the maximum pass count being
999,999.
•F:##### represents the number of times the memory test has failed and finished
with errors. Initially 0000 displays with the maximum fail count being 99,999.
Initially only four digits appear, but additional digits appear as needed.
Each time a test is completed, the number of pass and failures increments. If the test fails,
the message Failure displays for approximately three seconds, and the failure count
increases by one.
The test continues until all standard and optional DRAM is tested. Once the maximum
pass count or fail count is reached, the test is stopped, the power indicator is turned on
solid, and the final results display.
To stop the test before completion, turn the MFP off.
14

USB HS Test Mode
•Select USB HS Test Mode from HARDWARE TESTS.
•Press ▼until the appears next to the Port to be tested, and then press .
•Select the desired Test, and then press .
Port Test Appears on the display
Port 0 Test J Test K Test
SEO NAK Test
Packet Test Force
Enabled
USB High Speed Certification Testing...
Port 1 Test J Test K Test
SEO NAK Test
Packet Test Force
Enabled
USB High Speed Certification Testing...
Port 2 Test J Test K Test
SEO NAK Test
Packet Test Force
Enabled
USB High Speed Certification Testing...
Port 3 Test J Test K Test
SEO NAK Test
Packet Test Force
Enabled
USB High Speed Certification Testing...
To stop testing before completion, turn the printer off.
15

DUPLEX TESTS
Quick Test (duplex)
This test prints a duplex version of the Quick Test that can be used to verify that the
correct placement of the top margin on the back side of a duplex page. You can run one
duplex page (Single), or continue printing duplex pages (Continuous) until Stop is
pressed. For information about changing the margin, see “Top Margin (duplex)” below.
Note: Before you set the duplex top margin, be sure to set the registration.
See “Registration (printer)” on page 9.
The paper you choose to print the page on should be either Letter or A4.
To run the Quick Test (duplex):
•Touch to select Quick Test from DUPLEX TESTS
•Touch to select Single or Continuous.
•The single Duplex Quick test cannot be canceled.
•The printer attempts to print the Quick Test Page from the default paper source. If
the default paper source only supports envelopes, then the page is printed from
Tray 1.
•Check the Quick Test Page for the correct offset between the placement of the
first scan line on the front and back side of a duplex sheet.
The single test stops automatically when a single duplex sheet is printed, and the
continuous test continues until you press Stop.
Top Margin (duplex)
This setting controls the offset between the first scan line on the front of the duplex page
and the first scan line on the back of the page. Therefore, be sure to set the top margin in
REGISTRATION before setting the duplex top margin.
See “Registration (printer)” on page 9.
To set the Top Margin (duplex):
1. Print the Quick Test (duplex):
2. Touch to select Quick Test from DUPLEX TESTS
3. Select Single.
Hold the page to the light to see the whether the top margin of the backside aligns with
the top margin of the front side.
4. Select Top Margin from DUPLEX TESTS
5. Use the arrows to increase or decrease the current setting displayed on the touch
screen to select the margin setting:
◄[setting's current value] ►
Each increment shifts the duplex top margin by 1/100 of an inch. The Top Margin
(duplex) range is -25 to +25, and the default value is 0. An increase moves the top margin
down and widens the top margin. A decrease moves the top margin upward and narrows
the top margin.
6. Touch Submit.
Print the Quick Test (duplex) again to verify the adjustment. Repeat if necessary.
16

Sensor Test (duplex)
This test is used to determine whether or not the duplex sensors and switches are working
correctly. The test allows you to actuate the duplex input sensor located in the back part
of the duplex unit and the duplex exit sensor located in the return paper path.
•Select Sensor Test from DUPLEX TESTS. The message “Sensor Test Testing”
displays.
•Manually actuate each of the duplex sensors. When the sensor/switch is closed,
CL (closed) displays, and when the sensor/switch is open, OP (open) displays.
•Duplex input sensor
•Duplex exit sensor
•Press Stop to exit the test.
Motor Test (duplex)
This test lets you test the duplex option paper feed drive system, and verify that the
power and velocity values are acceptable. The duplex runs the DC motor at high speed
and low speed, taking an average of the power (PWM) required for each speed and
calculating the KE value.
To run the Motor Test (duplex):
•Select Motor Test from DUPLEX TESTS. The power indicator light blinks, and
the message “Motor Test Testing” displays.
•When the motor stops, the results are displayed. Listed below is an example of
such results:
•Touch Back or press Stop to exit the test.
Duplex Feed 1
This test feeds a blank sheet of paper to the duplex paper stop position 1. This test can be
run using any of the supported paper sizes.
•Touch select Duplex Feed 1 from DUPLEX TESTS. The power
indicator blinks while the paper is feeding, and the message “Duplex Feed
1 Feeding…” displays.
•The message “Duplex Feed 1 Clear Paper” displays when the paper
reaches paper stop position 1, and the power indicator turns on solid.
•Remove the media from the duplex unit, and clear the message on the
operator panel by pressing Stop.
17

Duplex Feed 2
This test feeds a blank sheet of paper to the duplex paper stop position 2. This test can be
run using any of the supported paper sizes.
•Touch select Duplex Feed 2 from DUPLEX TESTS. The power
indicator blinks while the paper is feeding, and the message “Duplex Feed
2 Feeding…” displays.
•The message “Duplex Feed 2 Clear Paper” displays when the paper
reaches paper stop position 2, and the power indicator turns on solid.
•Remove the media from the duplex unit, and clear the message on the
operator panel by pressing Stop.
18

INPUT TRAY TESTS
Feed Tests (input tray)
This test lets the servicer observe the paper path as media is feeding through the printer.
A blank sheet of paper feeds through the printer as the laser turns off during this test. The
only way to observe the paper path is Next to open the lower front door that is used to
access the envelope or multipurpose feeder. The paper is placed in the output bin.
To run the Input Tray Feed Tests:
•Select Feed Tests from INPUT TRAY TESTS.
•Select the input source from the sources displayed on the Feed Tests menu. All
installed sources are listed.
•Select either single or continuous.
Single - feeds one sheet of media from the selected source. Continuous - media
continues feeding from the selected source until Stop is pressed.
Sensor Test (input tray)
This test is used to determine if the input tray sensors are working correctly.
To run the Input Tray Sensor Test:
•Select the Sensor Test from INPUT TRAY TESTS.
•Select the input source from the sources displayed on the Sensor Test menu. All
installed sources are listed.
•Select the sensor to test. Various sources have different combinations of sensors.
See the table below:
[sensor selected]=Open displays.
Empty - Input tray empty sensor
Low - Input tray paper low sensor
passThru - Input tray pass thru sensor
Once this message displays, you can manually actuate each sensor. The tray empty
sensor can be actuated by hand, however a sheet of paper can be used to cover the
pass thru sensor. When the sensor is closed, Closed displays; when the sensor is
open, Open displays. Press Stop to exit the test.
19

OUTPUT BIN TESTS
Feed Tests (output bins)
Use these tests to verify that media can be fed to the standard output bin. No information
is printed on the media fed to the output bin, because the printhead is not engaged during
this test. These tests can use any Next media size or envelope supported by the printer.
To run the Feed Tests for the output bins:
•Select Feed Tests from the OUTPUT BIN TESTS.
•Select the output bin you want the paper to exit into.
•Select either Single or Continuous.
Single - feeds one sheet of media from the selected source. Continuous - media
continues feeding from the selected source until Stop is pressed. Touch Back to return to
OUTPUT BIN TESTS.
Sensor Test (standard output bin)
This test is used to verify if the standard bin sensor is working correctly.
To run the Sensor Test for the standard bin:
•select Sensor Test from OUTPUT BIN TESTS
•select Standard Bin from Sensor Tests
•Manually actuate the bin sensor by moving the flag in and out of the sensor, and
the display changes. The following screen is displayed:
Bin Empty: empty or Bin Empty: full
•Press Stop to exit the test
20