INTRODUCTION
I-E96-624A
5 - 1
SECTION 5 - TROUBLESHOOTING
INTRODUCTION
If errors occur while the interface is operating, the CPU LEDs
on the PPT faceplate display error codes. Table
lists the
error codes and corrective action.
NOTE: Codes are displayed only when the PPT is halted and the
Status LED is red. A 0 represents a LED that is off and a 1 repre-
sents a LED that is on.
Table 5-1. Table 5-1. PPT Error Codes
LED
8 7 6 5 4 3 2 1
Meaning
Corrective Action
0 0 0 0 0 0 0 1
An error affecting the NVM checksum has
occurred.
None.
0 0 0 0 0 0 1 0
An error occurred while the PPT was writing
to its non-volatile memory.
None.
0 0 0 0 0 0 1 1
External communication equipment failure
detected.
Check the external communication
equipment.
0 0 0 0 1 0 1 1
Contact 7 of Option Switch U72 has been
set (NVM initialized).
None.
0 0 0 0 1 1 0 0
NVM write in progress when power lost.
None.
0 0 0 0 1 1 0 1
An error occurred in communication
between primary PPT and redundant PPT.
None.
0 0 0 0 1 1 1 0
PPT redundancy switches (Option Switch
U72 contact 8) are the same.
Set U72 (position 8) on secondary
PPT to 0 and U72 on the primary
PPT to 1.
0 0 0 0 1 1 1 1
Primary PPT failed before its configuration
was copied to the backup.
Reset the secondary PPT and
enter the configuration.
0 0 0 1 0 0 0 0
Secondary PPT loop address (U75) does
not match primary PPT.
Set secondary PPT loop address
to match the primary PPT loop
address.
0 0 0 1 0 0 0 1
Secondary PPT control mode or RS-232C
mode (DCE or DTE) or ID (local or remote)
does not match primary PPT.
Check the option switch settings
(U72) on the secondary PPT.
0 0 0 1 0 0 1 0
BTM not responding.
Replace the BTM.
0 0 0 1 0 0 1 1
ROM checksum error.
Reset the PPT.
0 0 1 1 0 0 0 0
The system tried to force control to the
redundant PPT while the primary PPT was
still functioning.
None.
0 0 1 1 0 0 0 1
A fault in either the CPU or MEM boards
exists.
Replace the PPT.
0 0 1 1 0 0 1 0
An addressing error occurred on internal
microprocessor address bus.
Reset the PPT.
0 0 1 1 0 0 1 1
Attempt to execute an illegal processor
instruction.
Reset the PPT.