Electro Cam PL-1746 Series - Manual (Page 107)

7-2 Troubleshooting
PS-6400 Keypad Troubleshooting
The keypad cannot be repaired in the field. If a unit fails, do not disassemble it.
Return it to the factory for replacement.
Keypad Fault LED If the Fault LED on the keypad lights, turn the controller off and back on. If the keypad
Fault LED does not go off, the keypad microprocessor has malfunctioned. Return the
keypad to the factory.
Keypad Diagnostics The keypad includes a series of diagnostics that show the status of various keypad
functions. To start the diagnostics, turn the controller off, then restart the controller
while pressing any key on the keypad.
General Troubleshooting (cont'd)
Problem Possible Solution
The Programming Error Register (I:S.7) or the Hardware Status/Error Register (I:S.5)
may have an error bit set. This will prevent writing any data to the M:O files until the
error is cleared. Clear the error by toggling bit O:S.0/8 from a 0 to a 1. Backplane: Unable to write
to the 1746 programming
functions in the M:O files