User's Manual

EX7100 Technical Manual - Module Descriptions
©1999 Exicom Technologies (1996) Ltd 7-62 Issue 3 - May 2001
7.12.2 Testing and Fault Diagnosis
If it is suspected that the Display Module is not operating correctly, follow the steps
outlined in Figure 7.32.
Figure 7.32: Front Panel Fault Diagnostic Tree
Begin
Front Panel
Pow er LED on?
Ribbon Cable
Plugged into
Modem/Controller
Card?
Back Lightning
Operates w hen
Button is pushed?
Suspect that Pow er Supply
or Modem/Controller module
is faulty
Yes
No
No
Yes
Refer to Pow er Supply
Module Section 7.2 or
Modem/Controller
Module Section 7.11
Plug Ribbon Cable in
No
Plug Ribbon in
No
Yes
Front Panel module
appears to be
fault-free
Finish
Yes
LCD Operating?
Replace Front Panel
Module
No
Yes
Keypad Flexible
Ribbon Plugged in?
Replace Front Panel
Module