02/20002-29DocuPrint N2025/N2825 RAP 26, RAP 27Status Indicator Repair Analysis ProceduresInitial IssueRAP 26 Inoperative KeypadControl Panel is not operative.ProcedureEnter Diagnostics and select the Component Test. Scroll to Sensor Input test and press Enter[4]. The printer enters the Diagnostic Mode to the Sensor Input Level.Y NDisconnect P/J18 on the System Controller PWB. Measure the voltages listed in Table 1between P18 on the System Controller PWB and frame ground.All the voltages are correct.Y NReplace the System Controller PWB (REP 8.1).Disconnect P/J421 from the Control Panel. Measure continuity on all wires between P/J421 and P/J18. All checks are good.Y NReplace the Wiring Harness (PL 9.1).Replace the Control Panel Assembly (PL 1.1).Keypad numbers (1-7) increment the counter. Keypad number [4] enters the test and (0)exits the test.Y NReplace the Control Panel Assembly (PL 1.1).Replace the System Controller PWB (REP 8.1).RAP 27 Erratic Printer OperationProcedureEnter diagnostics and select Test Print. Run 20 test prints. The printer generates test prints.Y NSwitch the printer power off. Disconnect P/J168 from the LVPS Assembly. Switch the MainPower on. Check the voltage between P161 pin 10 and frame ground. The voltage is+5.0VDC.Y NGo to RAP 28.Switch the printer power off. Reconnect P/J168 to the LVPS Assembly. Enter diagnosticsand select Test Print. Run 20 test prints. The printer RESETS while generating testprints.Y NReplace the Print Engine Controller PWB (REP 8.5). The problem still appears.Y NProblem solved.Replace the Interface Cable connecting host to printer. Run test prints from the hostcomputer. The problem still appears.Y NProblem solved.Notify customer the cause of the trouble seems to be a communication problembetween the host computer and the printer. The customer should contact CustomerSupport.Go to RAP 44.The printer RESETS while generating test prints.Y NReplace the Print Engine Controller PWB (REP 8.5). The problem still appears.Y NProblem solved.Notify customer the cause of the trouble seems to be a communication problem betweenthe host computer and the printer. The customer should contact Customer Support.Go to RAP 44.Table 1 KeypadPin Voltage1 3.3 VDC2 0 VDC3 1.3 VDC4 0 VDC5 3.3 VDC6 1.3 VDC7 3.3 VDC8 0 VDC
