After SalesTechnical DocumentationRAE/RAK–1NFaultfinding/DisassemblyPage 8 – 12 Original, 05/971 Troubleshooting Diagram of the Power–On Malfunction0.Start2. 1.NO PLLDIV24 YES Vsys NOOK? OK?YES NO3. 3.1Bus ac tivity? NO YES(D/A, R/W, CS) Reset OK ?YES YES5. 5.1ErrorYESCPU relatedbeeps? error beeps?NO NO7.Respond to YESPING from host?NONO7.1.1 Valid NO 7.1Power OnBoot code in UC S–RS–bufferOK!Flash? actived?YES YES7.2 NOActivity in CPURxD0?YESNO 7.3 YESActivity in CPUTxD0?1.1Check PDApower unit2.1CheckPLL–circuit3.1.1CPU fault7.1.2Program UCS–Flash7.2.1RS–buffer fault6. Reboot and PINGfrom the PCLocalswhile in TestMode4.Check buzzerconnections5.1.2DRAM fault7.1.3CPU, or UCS–Flash fault
