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)