HP 8550 Service Manual - Page 506

E196/E197/E198 (printer) E196:The EEPROM (IC212) on the dc controller has an error. E197:A machine internal communication error occurs more than once. Or, the reception interruption on the dc controller side does not occur for a specific time for internal communication. E198:The IC on the dc controller has an error. Cause dc controller PCB Step 1 Checks Y/N Turn the copier off and then on. Is YES the problem corrected? NO Action End. Replace the dc controller PCB. E202 The scanner home position is not detected.This error occurs when the scanner does not return to the home position when it has been started. In response to this code, the control panel keys will lock, and the "Wait" message will appear. This code is indicated only on the Error History screen in service mode. Cause Step Checks Y/N 1 Is the scanner at home position NO when E202 is indicated? Original scanner 2 home position sensor (PS101) Does J1609A-2 on the reader NO controller PCB generate 5 vdc when the scanner is at PS101? Wiring 3 Scanner motor 4 driver PCB Scanner motor 5 (PM1) Is there any fault in the wiring or YES connectors from J1605 on the reader controller PCB to J303 and J302 on the scanner motor driver PCB? Replace the scanner motor driver YES PCB. Is the problem corrected? Replace the scanner motor (PM1). YES Is the problem corrected? NO Action See "The scanner motor fails to move forward or to move in reverse." on page 525. Check the wiring from the reader controller PCB to PS101; if normal, replace PS101. Connect the wiring correctly. End. End. Replace the reader controller PCB. 504 Chapter 7 - Troubleshooting EN