HP 750c Service Manual - Page 139

EEROM, Enter, Down Arrow, Up Arrow

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1. EEROM The purpose of this test is to clear or test the EEROM. It will test the: D EEROM. D Main PCA. The test clears the defaults of all calibration values and calculates a new EEROM checksum. The EEROM should only be cleared in the event of a checksum failure. Perform the EEROM test as follows: 1 In the Service Tests submenu, scroll to 1 EEROM" and press Enter. SERVICE TESTS 1 EEROM 2 The Clear EEROM / Test EEROM" message is displayed on the frontĆpanel. 3 Press the Down Arrow to test the EEROM. 4 The Testing / Don't Power Off" message is displayed on the frontĆpanel. 5 If the test passes, the Pass Test / Press Enter" message is displayed on the frontĆpanel. Press Enter to return to the Service Tests submenu. 6 If the test fails, the Fail Test / Press Enter" message is displayed on the frontĆpanel and you must clear the EEROM as follows: 7 Press Enter to return to the Service Tests submenu and then select the EEROM test. 8 Press the Up Arrow to clear the EEROM. The EEROM should only be cleared in the event of a checksum failure. Otherwise the EEROM should never be cleared. After clearing the EEROM, switch the plotter OFF and ON again without any media loaded and perform the following calibrations in the order listed: 1 Drop detect calibration ' page 7Ć4. 2 Line sensor calibration ' page 7Ć5. 3 Accuracy calibration ' page 7Ć6. It is recommended that a configuration plot is printed from the Utilities" menu for setup reference. You will also need to reconfigure the frontĆpanel settings. C4705-90000 Troubleshooting 8-21

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Troubleshooting
C4705-90000
8-21
1. EEROM
The purpose of this test is to clear or test the EEROM. It will test the:
D
EEROM.
D
Main PCA.
The test clears the defaults of all calibration values and calculates a new EEROM checksum.
The EEROM should only be cleared in the event of a checksum failure.
Perform the EEROM test as follows:
1
In the Service Tests submenu, scroll to ±1 EEROM" and press
Enter
.
SERVICE TESTS
1 EEROM
2
The ±Clear EEROM / Test EEROM" message is displayed on the frontĆpanel.
3
Press the
Down Arrow
to test the EEROM.
4
The ±Testing / Don't Power Off" message is displayed on the frontĆpanel.
5
If the test passes, the ±Pass Test / Press Enter" message is displayed on the frontĆpanel.
Press
Enter
to return to the Service Tests submenu.
6
If the test fails, the ±Fail Test / Press Enter" message is displayed on the frontĆpanel and
you must clear the EEROM as follows:
7
Press
Enter
to return to the Service Tests submenu and then select the EEROM test.
8
Press the
Up Arrow
to clear the EEROM.
The EEROM should only be cleared in the event of a checksum failure. Otherwise the
EEROM should never be cleared.
After clearing the EEROM, switch the plotter OFF and ON again without any media
loaded and perform the following calibrations in the order listed:
1
Drop detect calibration
'
page 7Ć4.
2
Line sensor calibration
'
page 7Ć5.
3
Accuracy calibration
'
page 7Ć6.
It is recommended that a configuration plot is printed from the ±Utilities" menu for
setup reference. You will also need to reconfigure the frontĆpanel settings.