Inter-Tel GMX-48 INSTALLATION & MAINTENANCE Manual

INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE TROUBLESHOOTING 
Issue 2, May 1990 
FIGURE 6-2. SYSTEM TROUBLESHOOTING CHART (CONT’D) 
SYMPTOM 
Unable to interface with 
computer call-up device 
(banking machine, answering 
machine, auto dialer, etc.) 
PROBABLE CAUSE 
Equipment being called 
is defective 
DTMF digit duration/ 
pause specifications of 
called equipment is 
incompatible with 
GMX-48 System 
CORRFCTIVE ACTION 
Ensure that the called equipment is 
functioning correctly. 
Check with...

TROUBLESHOOTING 
Issue 2, May 1990 INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE 
FIGURE 6-2. SYSTEM TROUBLESHOOTING CHART (CONT’D) 
SYMPTOM PROBABLE CAUSE 
CORRECTIVE ACTION 
RFI/EMI present over AC power source or 
conversations grounding incorrect Verify that the AC circuit is isolated and 
dedicated (see page 3-3) and check for 
proper grounding (see page 3-26). 
Grounding point is 
source of RFI/EMI While the system is running on AC power, 
temporarily remove the grounding wire to...

TROUBLESHOOTING 
Issue 2, May 1990 INTER-TEL PRACTICES 
GMX.48 INSTALLATION & MAINTENANCE 
FIGURE 6-3. C.O. LINE TROUBLESHOOTING CHART (CONT’D) 
SYhlPTOhj 
Cannot obtain C.O. dial 
tone 
PROBABLF CAUSE 
If reorder tone is heard, 
programming error 
If progress tone is heard, 
user error System is programmed to expect a forced 
account code. Refer to PROGRAMMING, 
page 5-22 and 5-49. 
Defective system 
channel or switching 
matrix Perform network self test. Refer to 
PROGRAMMING, page 5-128. 
Defective...

INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE TROUBLESHOOTING 
Issue 2, May 1990 
FIGURE 6-3. C.O. LINE TROUBLESHOOTING CHART (CONT’D) 
SYMPTOM PROBABLE CAUSE CORRFCTIVE ACTION 
Cannot place an outgoing 
call. C.O. dial tone is 
present. Intercom works. Programming error 
:.:; 
.j 
Defective C.O. line from 
central office 
Defective station 
instrument 
Defective system 
channel or switching 
matrix 
Defective C.O. circuit 
Defective KCB Check station class of service (SCOS). See 
PROGRAMMING,...

TROUBLESHOOTING 
Issue 2, May 1990 INTER-TEL PRACTICES 
GMX.48 INSTALLATION dz MAINTENANCE 
FIGURE 6-3. C.O. LINE TROUBLESHOOTING CHART (CONT’D) 
SYMPTOM 
Outside calls dropped 
during conversation 
or upon answering 
C.O. line 
PROBABLE CAUSE 
User error (line key 
being pressed after 
initial connection is 
made) 
Defective C.O. line from 
central office 
Insufficient loop current 
supplied by central office 
IC-CO disconnect timer 
value is set too sensitive 
Inter-ring silence timer 
value is set too...

INTER-TEL PRACTICES TROUBLESHOOTING 
GMX-48 INSTALLATION & MAINTENANCE Issue 2, May 1990 
FIGURE 6-3. C.O. LINE TROUBLESHOOTING CHART (CONT’D) 
SYMPTOM J’ROBABLF CAUSE CORRFCTIVE ACTION 
Noise on C.O. line at all 
stations Defective C.O. line 
At the C.O. block, remove the bridging 
clips for the line. On the telco side of the 
block, use a test set to verify the C.O. line 
connection. Also, move the C.O. line to a 
different C.O. circuit. If the problem 
follows the line, contact the telephone 
company....

TROUBLESHOOTING INTER-TEL PRACTICES 
Issue 2, May 1990 GMX-48 INSTALLATION & MAINTENANCE 
FIGURE 6-3. C.O. LINE TROUBLESHOOTING CHART (CONT’D) 
SYMPTOM 
Other station conversations 
can be heard on the C.O. 
line (cross-talk) 
PROBABLE CAUSE 
Defective C.O. line(s) 
CORRECTIVE ACTION 
Isolate the line(s) with cross-talk by 
removing the bridging clips from the C.O. 
block. On the telco side of the block, 
attach a test set to each line and check for 
cross-talk. If present, contact the phone 
company....

INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE TROUBLESHOOTING 
Issue 2, May 1990 
FIGURE 6-4. FEATURE TROUBLESHOOTING CHART 
SYMPTOM 
Feature does not work 
properly 
J’ROBABLE CAUSE 
User error 
Programming error 
Defective station 
instrument Replace the station instrument and/or 
perform the keyset self-test as described in 
INSTALLATION, page 3-40. 
Defective station circuit Replace defective KCB, EXP, or APM. 
Defective KCB Refer to page 6-2 to test the system 
voltages. Replace the control...

TROUBLESHOOTING 
Issue 2, May 1990 INTER-TEL PRACTICES 
GMX-48 INSTALLATION & MAINTENANCE 
FIGURE 6-4. FEATURE TROUBLESHOOTING CHART (CONT’D) 
SYMPTOM PROBABLE CAUSF CORRFCTIVE ACTION 
Cannot transfer incoming 
C.O. calls or place them 
on hold User error 
Inter-ring silence timer 
is set too sensitive 
User error (line key 
being pressed after 
initial connection is 
made) 
Programming error Refer to FEATURES for procedures. 
Ensure timer value is set longer than the 
C.O. ring off time. Refer to...