Allen-Bradley 2707-MVH232, User Manual, Page: 56 / 92

Publication 2707-UM005B-EN-P
8-2 Troubleshooting and Maintenance
Common Operating
Problems
If there is no display on the MicroView, verify that 24 VDC is present
at the 8-pin DIN connector (pins 1 and 2). If not, check the DC power
from the MicroLogix controller through the communications cable.
The most common problems are related to cabling configurations and
the communication parameters (baud rate, data bits, parity). These
parameters must be identical for both the MicroView and the
controller. Cabling and the communications parameters are always the
first things to check.
If the communications cabling and communications parameters are
correct, perform the diagnostic tests to rule out any non-functioning
features of the MicroView.
Error Messages Refer to the following when the MicroView displays an error message.
Message Probable Cause(s) Corrective Action(s)
Core ROM: FAIL
Any Key to Cont. Core ROM (boot code)
checksum test failure at
power-up or reset. Possible defective ROM.
Reset the MicroView and
re-check. If the problem still
exists, return the MicroView
for repair.
FATAL ERROR
Operation Halted Core ROM checksum test
failure at power-up or reset. Possible defective ROM.
Reset the MicroView and
re-check. If the problem still
exists, return the MicroView
for repair.
Sys ROM: Fail
Any Key to Cont. Operating system checksum
is incorrect. Possible bad operating
system. Reset the
MicroView and re-check. If
problem still exists,
re-download operating
system through the
programming software. If
the problem is not corrected,
return the MicroView for
repair.
Prg ROM: Fail
Any Key to Cont. Application file checksum is
incorrect. Reset the MicroView and
re-check. If problem still
exists, reload the application
file and recheck. If problem
is not corrected, return
MicroView for repair.
Access Denied
ENTER To Cont. The security code entered
did not match any of the 3
stored security codes in the
application program. To check for input error - try
again. If security codes have
been forgotten, view the
application file using
MicroView programming
software on a PC.