5.
Make sure that the formatter is seated and operating correctly. Turn off the product and remove
the formatter. Reinstall the formatter, and then verify that the heartbeat LED is blinking.
6.
Remove any external accessories or devices, and then try to turn the product on again.
NOTE:
If the control-panel display is blank, but the main cooling fan runs briefly after the product
power is turned on, try printing an engine-test page to determine whether the problem is with the
control-panel display, formatter, or other product assemblies.
Control-panel checks
The product includes a diagnostic test mode for the control panel. This mode allows you to troubleshoot
issues with the touchscreen, speaker, and
Home
button.
TIP:
To diagnose control-panel problems, see
Control-panel diagnostic flowcharts on page 126
.
NOTE:
Some of the diagnostic tests are for factory use only.
Open diagnostic mode
1.
Tilt the control panel forward. On the back side of the control panel, use a paperclip to press the
button inside the small hole near the center of the control panel.
2.
Repeatedly pressing the button will scroll through additional screens on the control-panel display.
Continue to press the button to scroll back to the diagnostic-mode main test screen.
Exit diagnostic mode
Do one of the following:
●
Touch the Stop button.
●
Wait 20 seconds and the control panel will return to the Home screen.
Exits a test
Selects test settings
124
Chapter 2 Solve problems
ENWW
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Страница 442: ...2 Open the upper left door 3 Press the green tab down to open the bar 410 Chapter 2 Solve problems ENWW ...
Страница 457: ...4 Close the fuser jam access cover 5 Close the fuser door ENWW Clear jams 425 ...
Страница 475: ...1 Lift the document feeder latch 2 Open the document feeder cover ENWW Clean the product 443 ...
Страница 512: ... 2009 Hewlett Packard Development Company L P Rev 04 09 480 Appendix A Service and support ENWW ...
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