Mitel Sx 50 Dpabx Instructions Guide

Troubleshooting Procedures and General Maintenance Information 
A 12 0034 NO TRUNK RELEASE ACK. 05/02 
Alarm Code 
Equipment Number 
Explanatory message 
Slot/Circuit (where applicable) 
The console bell sounds whenever an alarm is generated. If the bell has been muted, 
the word BELL flashes on the LCD display. The bell stops when the ALARM key is 
pressed to read the alarm message. 
lay LED is located at the right edge of the Control C 
under the cover. A flashing digit shows the number of alarms in...

Status and Alarm Indicators 
GROUNDING 
---- BRACKET 
TEST POINTS 
1-1 II III RESET SWITCH 
II III 
4 
II 
3 STATUS 
2 SWITCH 
II ---- RS-232 PORT 
J4 
(ATTENDANT CONSOLE) 
7-SEGMENT 
DISPLAY 
CARD 
EXTRACTOR 
 EDG BAR 
DD0039 
-~. - 
9104-091-350-NA Issue 5 
Revision 0 
350 2-5  

Troubleshooting Procedures and General Maintenance Information 
GROUNDING 
AC NIGHT BELL 
RESET SWITCH 
3 STATUS 
2 SWITCH 
1 
it-1 I RS-232 PORl 
II -ATTENDANT CONSOLE) 
II  7-SEGMENT 
DISPLAY 
 CARD 
EXTRACTOR 
EDG BAR 
350 2-6 
Revision 0 
9104-091-350-NA Issue 5  

SELF-DIAGNOSTIC TEST 
3.1 Volatile RAM, PROM checksum and signal processor diagnostics are performed at 
system startup. A memory or signal processor failure is indicated by displaying a fatal 
error code on the Control Card 7-segment LED. This code identifies the failing 
component type (RAM, PROM or signal processor). 
If a fatal error is detected at startup, the system does not attempt to complete the startup 
sequence, but remains in the power fail transfer mode until reset. 
3.2 Diagnostic tests are...

Troubleshooting Procedures and General Maintenance Information 
RAM and PROM checksum tests are also carried out as background tasks while the 
system is running. 
Paged non-volatile RAM checksum tests (similar to PROM checksums) are made as 
part of the set of background diagnostics tests. If a write to a non-volatile RAM is made 
while it is being checksummed then the test is aborted. 
Failed memory components are only alarmed once. The alarm message (background 
diagnostics only) identifies which page...

Self-Diagnostic Tests 
received energy, and the energy around the test tone frequency must both be within 
20% of the known transmitted test tone energy. A console loopback error is 
generated if the console fails its loopback test. 
3.8 Line/trunk diagnostics are run if the tone detector is operational. Line and trunk cards 
are scanned for circuits in the idle state. The codec for each idle circuit is placed into 
analog loopback mode and a test tone from the tone generator is routed through the 
codec...

Troubleshooting Procedures and General Maintenance Information 
The early line split hardware is also tested. If the test fails, an alarm is generated to warn 
that early line split hardware is not functioning correctly; the DTMF receiver is not 
busied-out. 
ling 
3.11 The integrity of the system scheduling queues is checked by ensuring that each 
slot-based device which ‘exists’ (has been recognized by the system) is on a 
scheduling queue. The converse is also checked; i.e., that no devices are...

TROUBIISHOOTNG 
PROCEDURES 
This Part presents procedures to help the field service engineer/installer analyze and 
troubleshoot problems based on the symptoms and any alarm codes that may have 
been generated. 
4.1 Handle circuit cards by their edges only and wear a ground strap properly connected 
to the card frame. 
nfir 
4.2 If a card has been replaced and the problem has been solved, the original card 
should be retried during a low traffic period to confirm that it was at fault. 
4.3 Card repair...

Troubleshooting Procedures and General Maintenance Information 
Follow the procedures one line at a time until the problem is solved. Generally, each 
step covers a less likely and more serious cause for the problem. For example, 
procedures call for a check of the wiring before they call for the replacement of a card. 
No lights or display. 
Check power supply fuses. (Six on left side,one near 
switch). 
Ensure that power switch is ON and is lit. 
Ensure the power cord is firmly seated at both ends....

Troubleshooting Procedures 
Table 4-3 l~~or~atio~ Collection a 
e Do all users experience this problem? 
0 Is the problem continuous or intermittent? 
date: AUG-25 
Night 
* Static easily generated 
e System located near heat, photocopier 
* Seating of cable connectors 
e Seating of cards 
0 Seating of Generic Module connector 
* Seating of Console connector 
* Cross-connect wiring 
er cover near 
bottom right of card) reads 0 
e Off-hook stations receive dial tone 
* The clock can be set to the correct...