01/026-138825/8830 Printer GP 4, GP 5General ProceduresGP 4 Drum Cleaning Enhancement1. Remove the Drum Assembly (REP 9.2).2. Use the dusting pouch (8R181) to apply a thin layer of Zinc Stearate over the entire sur-face of the drum.3. With a new lint-free cloth (600S4372), wipe the entire surface of the drum, using moder-ately heavy pressure. Use a back and forth motion of 6 - 10 strokes while revolving thedrum three revolutions.4. Repeat steps 2 and 3 one time and then continue with step 5.5. Apply a thin layer of Zinc Stearate over the entire surface of the drum.Reinstall the drum assembly.Rotate the Drum manually to clean off excess zinc stearate.GP 5 Communication Loopback TestNOTE: in order to perform this test, it is necessary to use the Loopback Kit (600K43210).For printers with a Controller:1. Remove the Controller and disconnect the ribbon cable (J307B) from the IOT Main PWB.2. Connect the loopback cable (152K59420) to J307B on the IOT Main PWB.3. Connect the loopback tool (114E4680) to the loopback cable.4. Enter [1402} to run the communication test.5. If the test passes, a 0 will be displayed. The problem is then in the ribbon cable or theController. Go to the E-701 RAP in the 8825/8830 Controller Service Manual.6. If the test fails (1), replace the IOT Main PWB ( PL 1.1A).For printers without a Controller:1. Connect the loopback tool to the lower connector located on the rear right side of the IOT.2. Enter [1402].3. If the test passes (0), the problem is the XPC or the connection between the XPC and theprinter.4. If the test fails (1), remove the right rear lower cover and disconnect the cable at J308 onthe Main PWB.5. Connect the loopback cable (152K59420) into J308 and connect the loopback tool(114E04680) to the loopback cable and repeat the test.6. If the test passes, replace the cable.7. If the test fails, replace the IOT Main PWB ( PL 1.1A).
