TM 5-3895-374-24-1 Chapter 9 Troubleshooting The Following Probable Cause Recommended Action Error Exists 1. Monitor logic In Run mode and verify desired I/O status 2. Check for minor CPU faults User Program System Logic Error Refer to either the Hand-Held Terminal User Manual Inoperable (Catalog Number 1747-NP002) or the Advanced No Major CPU Programming Software User Manual (Catalog Number Faults Detected 1747-NM002) Defectives I/O Test Inputs and outputs according to I/O troubleshooting Devices or I/O procedures starling on page 926 Wiring The Following Probable Cause Recommended Action Error Exists CPU Memory Cycle power Error 1. Remove power and then remove the memory module from the processor 2. Reinstall the processor and re-apply power to the Faulty Memory power supply Module If steady CPU FAULT LED changes to flashing, replace the existing memory module with a replacement module Refer to chapter 5 for removing and Installing memory modules CPU Fault 1. Place the processor in another chassis not in the existing system and cycle power If steady CPU FAULT LED reappears, replace the Faulty CPU/Power processor Supply 2. If CPU FAULT LED clears, monitor the line power going to the power supply In existing system 3. Replace existing system power supply it line power checks OK Processor If upgrading the processor to a different firmware level, Firmware Installed verify firmware chip orientation matches the upgrade kit Incorrectly directions Refer to the following key to determine the status of the LED indicators Indicates the LED is OFF Indicates the LED is ON Indicates the LED is FLASHING Status of LED does not matter The RUN LED on the 5/01 processor is actually labeled ’PC RUN " Also, the 5/01 processor does not have a COMM LED (page 3-439)