HP 1050c Service Manual - Page 98
If This Test Passes, Do Not Replace The Drop
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Service Tests and Utilities 7 If the test passes, then the following message will appear on the front panel: DROP DETECTOR BLOCKED DD: PASS GHOST DROPS: PASS WARNING IF THIS TEST PASSES, DO NOT REPLACE THE DROP DETECTOR. If there is a problem with the Drop Detector then the following message will appear on the front panel: DROP DETECTOR Blocked DD: Fail Code: 00XXXX:0000XX WARNING In this case, to resolve the problem, try the following: 1 Check that the Drop Detector Cable is NOT broken or damaged. 2 Check that the Drop Detector cable is correctly connected to the Service Station Cable. 3 Check that the Service Station Cable is NOT broken or damaged. 4 Remove the Drop Detector and make sure that there are no obstacles inside which are blocking the sensor. 5 Replace the Drop Detector Assembly ⇒ Page 8-10. 6 If the test continues to fail, replace the Electronics Module ⇒ Page 8-25. Only replace one component at a time and try the Service Test again before replacing another component. Using this procedure you will be able to determine exactly which component failed. 4-24 HP DesignJets 1050C and 1055CM Printers Service Manual