Xerox WorkCentre Pro 423 Service Manual

Also see for WorkCentre Pro 423: Scanner guide Fax guide Brochure & specs Fax guide User guide

WorkCentre Pro 423/428 2-142 CHAPTER 2 TROUBLESHOOTING03/02 How to use the Diagnostic C/E Mode2.4.8 Self-diagnosisSelf-diagnosis checks inside the machine for a fault.The basic self-diagnostic operations are as follows:Auto DiagnosisThe machine is diagnosed about the items registered in the system data. The diagnosticitems can be changed by altering the system data. In CE mode, diagnostic processingreturns to the first item after finishing the last, and continues infinitely. In user mode,diagnostic processing stops after finishing the last.Individual diagnosisSpecified items are diagnosed individually. When specifying a diagnostic item, enter itsChain-Function code from the panel.Diagnostic result displayDiagnostic results are displayed on the panel at the end of processing. The results can alsobe output as a self-diagnostic report.Operating procedureEnter Diag. (CE) mode. Select LCD buttons in the following order:“Custom Presets“->“Diag“->“Chain Func“ Enter the Chain Code. Press the Function No. button. Enter the Function Code and press the Start Button. Self-diagnosis is executed. “No error” is displayed at normal termination or an error code(D code) at abnormal termination.System Data for Auto DiagnosisLabel ItemAUTO DIAG SELECT 1 Select auto diagnosis (M/F MAIN PWB/OP-MOT/OM)Bit7:G/A MSBC Register Read/Write CheckBit6:DRAM(LM) Add/Data Bus CheckBit5:DRAM(WN) Add/Data Bus CheckBit4:DRAM(OM) Add/Data Bus CheckBit3:DRAM(LM) March Pattern TestBit2:DRAM(WN) March Pattern TestBit1:DRAM(OM) March Pattern TestBit0:OP-MOT Loop Back TestAUTO DIAG SELECT 2 Select auto diagnosis (MMB)Bit7:ROMBit6: Not usedBit5:EEPROMBit4:SRAM Add/Data Bus CheckBit3:SRAM March Pattern TestBit2:RTCBit1: Not usedBit0: Not usedAUTO DIAG SELECT 3 Select auto diagnosis (VCEM0)Bit7:BP-F Register Read TestBit6:BP-F Register R/W TestBit5:BP-F DRAM Address/Data Bus TestBit4:BP-F DRAM March Pattern TestBit3:BP-F CODEC DMA TestBit2:BP-F CODEC CODEC TestBit1:BP-F CODEC EXPRED TestBit0:BP-F CODEC CLIPPER TestAUTO DIAG SELECT 4 Select auto diagnosis (G3M0) Bit7:DRAMBit6:DPRAMBit5:ROMBit4:DPMCBit3:RCNV, Image RAMBit2:MODEM Register, RAMBit1:MODEM Loop Back TestBit0:EEPROMAUTO DIAG SELECT 5 Select auto diagnosis (Panel)Bit7:PanelBit6: Not usedBit5: Not usedBit4: Not usedBit3: Not usedBit2: Not usedBit1: Not usedBit0: Not usedAUTO DIAG SELECT 7 Select auto diagnosis(G3M1)