Nortel Meridian M1250 Description page 42

Page 42 of 64 Attendant console operation
Table 3
M1250 failure codes (Part 2 of 2)
Failure code Reason
0EH A key in column E is stuck.
0FH A key in column F is stuck.
C0H The SRC micro is not
responding.
90H The RS-232 port has failed
the loopback test.
88H The EPROM, U18, does not
contain the correct ID, or is
faulty.
553-2201-117 Standard 10.00 January 2002
The failure codes produced by the firmware are bit-significant, as follows:
B7 B6
0 USART
1 SRC
* Refers to key's column number.
In most instances, the failure code accurately identifies the faulty hardware
component. However, if the microprocessor is faulty, the readings may be
unreliable or misleading.
Failure code 90H is always shown if the loopback test has not been
performed. Refer to "Data Port" on page 37.
What to do
Same as for 08H.
Same as for 08H.
Same as for 20H.
Check to see if the loopback connector is
inserted. If not, insert it and perform the
loopback test again. If the failure code still
appears, turn the console off and on while the
connector is inserted. Redo the loopback test.
If the failure code still appears, the console is
faulty and should be returned.
Same as for 20H.
B5 B4
RTC RAM
BLF RS232
B3 B2
KEYS c2
EPROM 0
B1 B0
c1 c0*
0 0