Allen-Bradley 2707-MVH232, User Manual, Page: 55 / 92

1 Publication 2707-UM005B-EN-P
Chapter
8
Troubleshooting and Maintenance
Chapter Objectives
This chapter describes how to isolate and correct the most common
operating problems and routine maintenance tasks. It contains these
sections:
Troubleshooting
Recommendations Most errors are accompanied by an error message. Find the error
message in the error message listing and perform the recommended
corrective action.
If you encounter a problem that is not listed in the table, contact your
local Allen-Bradley distributor for assistance.
Equipment Required
Other than verifying that the correct power source is connected to the
terminal (use a voltmeter), no electronic diagnostic equipment is
required for troubleshooting.
Section Page
Troubleshooting Recommendations 8-1
Equipment Required 8-1
Common Operating Problems 8-2
Error Messages 8-2
Communication Error Codes 8-4
Using the Test Functions 8-4
Display Test 8-6
Core ROM Test 8-6
System RAM Test 8-7
System ROM Test 8-8
Program ROM Test 8-9
Keyboard Test 8-10
Communications Port Test 8-12
Watchdog Test 8-13
Cleaning the display window. 8-14
ATTENTION
!
Always disconnect power when checking wiring
connections. Failure to take adequate precautions
may result in severe electrical shock or equipment
damage.