HP LaserJet 4 Service Manual - Page 253
PS3 Exit Sensor Check, Pickup Motor Functional Test M2
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PS3 (Exit Sensor) Check 1 Open the rear door (cover) of the printer. 2 The display should read 13 PAPER JAM (or REMOVE PAPER JAM) immediately after the door is opened. 3 Close the rear cover. The display should change from 02 WARMING UP to 00 READY. a If the 00 READY message does not appear, check that the rear door is not damaged, and the the door closes and latches properly. b If the PAPER JAM message does not appear, replace PS3. Pickup Motor Functional Test (M2) There is not a good method with which to access the test points around the Pickup Motor (M2) circuit. Therefore, when troubleshooting Pickup Motor failures, perform the following in the order listed (see Figures 7-11 and 7-12 for component location). 1 Reseat J601 and J602 on the Paper Control PCA. 2 Reseat J201 on the DC Controller. Reseat J703 on the Sensor PCA. 3 Verify that the Paper Control PCA and the Sensor PCA are firmly seated into one another. 4 Replace the Pickup Motor. 5 Replace the Paper Control PCA. 6 Replace the Sensor PCA. Troubleshooting 7-23