Inter-Tel Imx/Gmx 256 Installation And Field Maintenance Manual

							lNTER-TELPRAc~cEsIMX/GMX 256 INSTALLATION & MAINTENANCE
TROUBLE!SHOOTING
Issue 1, November 1994
FIGURE 6-2.SYSTEM TROUBLESHOOTING CHART (CONT’D)
SYMPTOM
DISA inoperativePROBABLE CAUSEUser errorCORRECTIVE ACTIONRefer to l%KWREB, page 4-39, for correct pro-
cedures.
Telephone not compatibleUser must dial in 
from a DTMP telephone.
Programming errorEnsure that the 
trunk group is identified correctly
as a day or night DISA trunk group. Refer to PRO-_ GRAMMING, page 
5-111.
Defective trunk cardReplace the associated card.
Defective RCPU CardRefer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.
NOTE: Due to the natural characteristics of the CO trunk, the volume level of 
DIMP tones transmitted over the trunk
may be substantially reduced before reaching the 256 System. This natural degradation in tone volume may adversely
affect the reliability of the DISA feature. Other factors which can affect 
DISAperformance are CO trunk noise and the
quality and strength of the 
DTMP tones generated by the off-premises phone itself.SYMPTOM
&table to interface with
computer call-up device
[banking machine, 
answer-
ng machine, auto dialer,
SC.)PROBABLE CAUSE
fgipgnt being called is
DTMP digit duration/pause
specifications of called
equipment is incompatible
with 
256 System
CO 
trunk is designated fordial-pulse signaling
Defective trunk card
Defective RCPU Card
CORRECTWE ACTION
Ensure that the called equipment is functioning
correctly.
Check with the equipment manufacturer for
MMP digit duration/pause specifications. Adjust
IYIMP Digit Duration/Pause timer. (Refer to page5-77 in 
PROGRAMMING.)Default value is 6/100
second.
CO trunk must be designated as 
DTMF. Refer to
page 5-103 in PROGRAMMING.
Replace the associated trunk card.
Refer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.
Page 6-15 
						

							TROUBLESHOOTINGIssue 1, November 1994INTER-TELPRACTICESIMX/GMX 256 INSTALLATION & MAINTENANCE
FIGURE 6-2.SYSTEM TROUBLESHOOTING CHART (CONT’D)
,
SYMPTOM
No music-on-hold/back-
ground music (external mu-
sic source connected)
SYMPTOM
XFI/EMI present over con-
rersations
PROBABLE CAUSE
External music source
turned off or inoperative
CORRECTWE ACTION
Check the external music source for proper opera-tion. Optimal input level is 
.775VRMS (OdB). Re-
fer to INSTALLAI’ION, page 3-99.
RCPU Card MOH jumperMove the music-on-hold jumper strap(s) on the
strap(s) not in proper 
posi-RCPU Card to the ON position.
tion (no MOH, but back-
-
ground music is operative)
Defective cable betweenRepair or replace the cable. Check to see that the
music source and RCPUproper 
connector was used. Refer to SPECIFICA-
CardTIONS, page 2-10.
Defective RCPU CardReplace the RCPU Card.
PROBABLE CAUSE
AC power source or ground-
ing 
incmrect
Grounding point is source of
AC power source is causing
CORRECTIVE ACTION
Verify that the AC circuit is isolated and dedicated
(see page 3-3 in 
INST&LAIION) and check for
proper grounding (see page 3-41 in INSTALLA-
TION).
While the system is
running on AC power, tempo-
rarily remove the grounding wire to determine if it
is the source of the 
RFI/EMI. See page 3-41 in
INSALmON for proper grounding require-
ments.
If an external battery back-up power source is in-
stalled, switch system operation to battery back-up
power by unplugging the power source’s AC pow-
er cord (with grounding wire connected to equip-
ment cabinet). If 
RFI/EMI stops, the AC power
source is the cause. Install an 
RFI/EMI filter or
equivalent on the AC outlet.,
NOTE: For further RFI/EMI troubleshooting assistance while ou site, certified technicians should contact Technical
Service with the following information:1. Modulation
- AM, FM, or other
2.Frequency of the interfering station (in Hz)3. Broadcast power
4.Distance between equipment cabinet and broadcast antenna5. Who hears 
RFkl Outside call
- inside party only?l Outside call
- outside party only?
0Outside call - both parties?
0 Intercom call- one or both parties?
m 6.Type of instrument(s) on which RFI is heard-Standard Digital Keyset, Executive Digital Keyset, IMX 24-line
keyset, IMX 24-line AIM keyset, IMX 12&e keyset, IMX 12-line Al&I keyset, lMX g-line keyset, IMX g-line
AIM keyset, Inter-Tel/DVK 24&e keyset, Inter-Tel/DVK la-line keyset, Inter-Tel/DVX g-line keyset, GMX
24&e keyset, GMX 12-line keyset, GX 24line keyset, ESLS, SLI, or single-line DTMF set
Page 6-16 
						

							INTER-TELPRACTICESIMWGMX 256 INSTALLATION % MAINTENANCETROUBLESHOOTINGIssue 1, November 1994
FIGURE 6-2.SYSTEM TROUBLESHOOTING CHART (CONT’D)
SYMPTOM
PROBABLE CAUSECORRECTWE ACTION
Faulty DID numbers dis-
User error (after dialing theOnly valid DID “start” digits can be properly pro-
played at attendant stationscorrect 3- or 4digit “base”cased by the system.
number, the user entered in-
correct or incomplete “start”
digits)
Rogmnming errorEnsure that all valid DID numbers have been pro-
-gmnmed to ring in to the appropriate locations.
(See page 5-107 in PROGRAMMING.)
Defective DID trunk 
fromAt the DC block, remove the bridging clips for
central office (the system isthe trunk. On the system side of the block, use a
receiving incomplete or mu-
test set to verify the DID trunk connection and the
tilated DID “start” digits)system’s ability to accept and process valid digits.
Also, move the trunk to a known good 
IDC circuit.
If the problem follows the trunk, contact the tele-
phone company.
Defective 
IDC CardReplace the associated IDC Card.
Page 6-17 
						

							~O~LESEOOTINGSue 1, November 1994INTER-TELPRACTICESIMX/GMX 256 INSTALLATION & MAINTENANCE
FIGURE 6-3.CO TRW TROUBLESHOOTING CHART.-:._;;SYMPTOM
20 trunk inoperative
hroughout the systemPROBABLE CAUSECORRECTIVE ACTIONDefective CO trunk fromAl the associated CO block, remove the bridging
central officeclips for the trunk. On the 
telco side of the block,
use a test set to verify the CO trunk connection.
Also, move the CO trunk to a known good CO
circuit. If the problem follows the trunk, contact
the telephone company.
Trunk is dedicated to a 
set- -Verify the type of CO trunk. Instruct users to dial
ondary carrier requiring anaccess code if required.
awess code
Defective cabling or 
mis-
wired 
amphenol connectorUsing a test set, ensure presence and correct 
loca-
tion of the CO trunk at the associated CO block.
on the trunk card
Programming errorEnsure that the trunk is assigned to the correct
trunk group and stations have been given access to
it. 
See page S-109 in PROGRAMMING.
Trunk has been taken out ofPlace the trunk back in service. Refer to PEA-
service by the attendant
TURES, page 4-113, or page 5-148 in PRO-
GRAMMING.
Defective trunk card
Replace the associated trunk card.
Defective RCPU CardRefer to pages 6-1 and 6-2 to test the system
voltages. Replace the card if faulty.
WMPTOMPROBABLE CAUSECORRECTIVE ACTION
Cannot obtain CO dial toneIf reorder tone is heard, pro-
Ensure that keyset has outgoing access. Refer to
gramming error
page 5-34 in PROGRAMMING.
Check to see if the 
keyset is programmed for LCR
only. Refer to page 5-42 PROGRAMMING. If so,
check LCR programming, page 5-98 in PRO-
GRAMMING.
If progress tone is heard,
user error
Defective trunk card
Defective RCPU CardEnsure trunk is assigned to the correct trunk group.
Refer to page 5-109 in PROGRAMMING.
System is programmed to expect a forced 
accOunt
code. Refer to
PROGRAMMING, page 5-55.
Replace the associated trunk card.
Refer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.
Page 6-18 
						

							yl&sT&&MmCTICEs!STALIATION & MAINTENANCETROUBLESHOOTINGIssue 1, November 1994
FIGURE 6-3.CO TRUNK TROUBLESHOOTING CHART (CONT’D)SYMPTOM
fiw volume on all CO
runks, cannot break CO dial
onePROBABLE CAUSE
Defective trunk card
Defective CO trunk from
central office
Open or loose connection in
the cable between the power
supply and 
cardfile
Defective power supply
module(s)
Hybrid balance mismatch
NOTE: See also 
keyset problems on page 6-32.SYMPTOM
Zamtot break CO dial tonePROBABLE CAUSECO circuit is programmed
for wrong signaling type
Defective CO trunk 
from
central office
Timer error
Defective trunk card
Defective RCPU CardCORRECTIVE ACTION
Measure -12VDC at the RCPU Card test points.
(See page 3-61.) If it is not within tolerance, re-
move all trunk cards and check voltage again. If
the voltage returns to normal, replace the cards
one at a time until the defective card is isolated
and replaced.
At the CO block, remove the bridging clips for the
trunk. On the telco side of the block, use a test set
to verify the CO trunk connection. 
Also, move the
CO trunk to a known good CO circuit. If the prob-
lem follows the trunk, contact the telephone 
com-
PanY.
If, with all trunk cards removed, the -12VDC is
s&l1 not within tolerance, turn off the system and
check the cable and 
comtector with an ohmmeter.
Replace or repair the faulty cable.
With all trunk cards removed, measure -12VDC at
the power supply connector(s). If not within toler-
ance, replace the power supply module(s).
Select the balance network 
- ideal, loaded, or
unloaded
- that best matches the trunk’s imped-
ance. See 
PROGRAMhIING, page 5-147.CORRECTIVE ACTION
Ensure that CO trunk and CO circuit use same
type signaling 
(DTMP or dial pulse). gee PRO-
GlLAMMING, page 5-103.
At the CO block, remove the bridging clips for the
trunk. On the telco side of the block, use a test set
to verify the CO trunk connection. Also, move the
CO trunk to a known good CO circuit. If the prob-
lem follows the 
trnnk, contact the telephone com-
PanYe
If trunk is DTMF, the DTMP Digit Duration/Pause
timer setting may not be compatible with the
trunk. See 
PROGRAMMING, page S-77.
Replace the associated trunk card.
Refer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.
NOTE: See also keyset problems on page 6-32.
Page 6-19 
						

							TROUBLESHOOTINGIssue 1, November 1994lNTzR-TELPRAcTrcEsIMX/GMX 256INSTALLATION & MAINTENANCE
FIGURE 6-3.CO TRUNK TROUBLESHOOTING CHART (CONT’D)
SYMPTOMPROBABLE CAUSECORRECTIVE ACTION
hnot place an outgoingPrognmming errorCheck station class of service (SCOS). See PRO-
gll; CO dial tone is present;GRAMMING, page 5-42. Check that equal access
ntercom worksand absorbed digit programmirq~ for the trunk
group are correct. See PROGRAMMING, page
5-113. If using 
LCR, check LCR programming on
page 5-98 in PROGRAMMING.
-Defective CO trunk fromAt the CO block, remove the bridging clips for the
central officetrunk. On the telco side of the block, use a test set
to verify the CO trunk connection. Also, move the
CO trunk to a known good CO circuit. If the prob-
lem follows the trunk, contact the telephone com-
pany.
Defective station instrumentReplace the station instrument and/or perform the
keyset self-test as outlined in INS’IAL~ON,
pages 3-64,3-73, or 3-85.
Defective trunk cardReplace the associated trunk card.
Defective RCPU CardRefer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.
SYMPTOMPROBABLE CAUSECORRECTIVE ACTION
other station conversationsDefective CO trunk(s)Isolate the trunk(s) with crosstalk by removing the
can be heard on the CObridging clips from the CO block. On the telco
trunk (crosstalk)side of the block, attach a test set to each trunk
and check for crosstalk. If present, contact the
telephone company.
Defective cabling or 
mis-Using a test set, ensure presence and correct loca-
wired 
amphenol connectortion of the CO trunk at the associated CO block.
on the trunk card
Defective station card
Defective trunk card
Defective RCPU CardReplace the associated station card.
Replace the associated trunk card.
Refer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.
Page 6-20 
						

							mTER-TELPRAcTIcEsWGMX 256 INSTALLATION & MAINTENANCETROUT3LJBHOOTlNGIssue 1, November 1994
FIGURE 6-3.CO TRUNK TROUBLESHOOTING CHART (CONT’D)SYMPTOM
Outside calls dropped during
conversation or upon an-
swering CO trunkSYMPTOM
CO trunk cannot be reseized
1PROBABLE CAUSECORRECTIVE ACTION
User error (trunk key beingInstruct users not to press the trunk key while on a
pressed after initial 
connec-
tion is made)call. Or, if necessary, set the CO Reseize timer to a
higher value. Default value is 3 seconds. See page5-77 in 
PROGRAMMlNG.Or, program the sta-
tion to disallow CO reseize. See PROGRAM-
MING, page 5-30.
Defective CO trunk from
-
central officeAt the CO block, remove the bridging clips for the
trunk. On the telco side of the block, use a test set
to verify the CO trunk connection. Also, move the
CO trunk to a known good CO circuit. If the prob-
lem follows the trunk, contact the telephone com-
pany.
Insufficient loop current
supplied by central officeCentral office must supply 20mA minimum loop
current.
ICC0 Disconnect timer
value is set too shortEnsure timer value is long enough to ignore nor-
ma1 interruptions in CO loop current. Default val-
ue is 0.6 seconds. See page 5-77 in 
PROGRAM-
MlNG.
Inter-Ring Silence timer val-
ue is set too shortEnsure timer value is set longer than the central
office ring signal is “off.” Refer to PROGRAM-
MING, page S-77.
Defective station instrumentReplace the station instrument and/or perform the
keyset self-test as outlined in INSTALLKI’ION,
pages 
3-64,3-73, or 3-85.
Defective trunk or station
Replace the associated card.
card
Defective RCPU CardRefer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.PROBABLE CAUSE
CORRECTWE ACTION
CO Reseize feature is dis-
abledCheck station programming as described on page5-30 in PROGRAMMING.If the CO reseize op
tion has been disabled, the user cannot reseize a
trunk until it has been disconnected by hanging up
or pressing another trunk key.
CO Reseize timer is set tooSet the timer to a lower timer value. Default valuehigh
is 3 seconds. See page 5-77 in PROGRAMMING.
Page 6-21 
						

							TROUBLESHOOTINGIssue 1, November 1994INTEX-TELPRACTICESIMWGMX 256 INS~TION & MAINTENANCE
FIGURE 6-3.CO TRUNK TROUBLESHOOTING CHART (CONT’D)SYMPTOM
Noise on CO tank at all sta-
tiOllSSYMPTOM
20 trunk remains seized af-
ier a call has been ended
IPROBABLE CAUSE
Defective CO trunk
Defective trunk card
Defective power supply
module(s)
Defective RCPU CardCORRECTIVE 
ACTtON
At the CO block, remove the bridging clips for the
trunk. On the telco side of the block, use a test set
to verify the CO trunk 
connection. Also, move the
CO trunk to a known good CO circuit. If the prob-
lem follows the trunk, contact the telephone 
com-
P”Y*
-Replace the associated trunk card.
Refer to 
INSTALIAI’ION, page 3-42, to perform
the power supply electrical test. Replace the power
supply module(s) if faulty.
Refer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.PROBABLE CAUSE
Characteristic of some ESS
x&al offices
[C-CO or CO-CO Discon-
nect timer value set too long
Defective CO trunk
Defective station instrument
Defective trunk card
Defective RCPU CardCORRECTIVE ACTION
Central office must provide disconnect signal. Or,
install a trunk release module available from most
supply houses.
Central office disconnect signal was not detected
by 
ICC0 or CO-CO Disconnect timer. Default
value of the 
ICC0 timer is 0.6 second, the CO-
CO timer is 0.35 seconds. See page 5-77 in PRO-
GRAMMING.
At the CO block, remove the bridging clips for the
trunk. 
On the telco side of the block, use a test set
to verify the CO trunk connection. Also, move the
CO trunk to a known good CO circuit. If the prob-
lem follows the trunk, contact the telephone 
com-
PanY.
Replace the station instrument and/or perform the
keyset self-test as outlined in INSTALLM’ION,
pages 
3-64,3-73, or 3-85.
Replace the associated trunk card.
Refer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.Page 6-22 
						

							INTER-TELPRACTICESIMx/GMx 256 INSTALLATION & MAINTENANCETROUBLESHOOTINGIssue 1, November 1994
FIGURE 6-3.CO TRUNK TROUBLESHOOTING CHART (CONT’D)
SYUPTOM
Ground start trunks not
hmctioning properly
PROBABLE CAUSE
System not properly
grounded
CORRECTIVE ACTION
Verify that the system AC circuit is isolated and
dedicated (see page 3-3 in 
INSTZLATION) and
check for proper grounding (see page 3-41 in IN-
STALLATION).
LGC jumper straps not set
correctly
Tip and riug are reversed
Programmiug error
6OHz AC power is getting
onto the trunksFor each ground start circuit, both corresponding
LGC jumper straps must be set in the GS position.
lf the strap settings are mixed, or if one or both of
the straps is missing, the circuit will not function
properly. Also, when setting the straps, note the
unique ordering of the LGC circuits as shown in
INSTi4LLN’lON on page 3-55.
At the CO block, check to make sure that tip and
ring are not reversed. See 
INSTALLATLON, page
3-13. Unlike loop start trunks, ground start trunks
are polarity sensitive.
Ensure that the trunks are identified correctly as
ground start trunks. Refer to 
PRGGRAMMING,
page 5-103.
Use a voltmeter to check the AC voltage between
tip and earth ground while the trunks are con-
nected to an LGC. If more than 5V 
(Rh4S) are
measured, there is AC power comamination (e.g.,
due to faulty wiriug insulation). Locate and re-
move the source of AC power contamination.
Page 6-23 
						

							TROUBLESHOOTINGIssue 1, November 1994INTER-TELPRACTIcEslMX/GMX 256 INSTALLATION & MAINTENANCE
FIGURE 6-4.FEATURE TROUBLESHOOTING CHARTSYMPTOM
?eature does not work prop
:rlySYMPTOM
Zannot transfer CO or inter-
zom calls to other stationsPROBABLE CAUSECORRECTIVE ACTION
User errorRefer to PRMURES for procedures. Also, ensure
that the feature is available on the software pack-
age installed.
Programming errorCheck feature code programming. Refer to 
PRO-
G-G, page 5-58. Also, check user-pro-
grammable feature key programming. Refer to
- PEAlWE& page 4-51, and PROGRAMMING,
page 5-44.
Defective station 
instrumentReplace the station instrument and/or perform the
keyset self-test as described in INSTALLATION,
pages 
3-64,3-73, or 3-85.
Defective station card
Replace the associated station card.
Defective RCPU CardRefer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.PROBABLE CAUSECORRECTIVE ACTION
User error (e.g., wrong fea-Refer to PEXWRES, page 4-70, for procedures.
lure code)
Called station is 
iu do-not-A station in do-notdisturb cannot receive trans-
disturbferred calls.
Call transferred to an illegalUse only valid intercom numbers.
intercom number
Called station is in a 
differ-To allow such transfers (if desired), place the two
ent tenant group and 
cross-stations in the same tenant group or allow cross-te-
tenant traffic is deniednant traffic. See 
PROGRAMh4lNG,page 5-67.
Defective station instrumentReplace the station instrument and/or perform the
keyset self-test as described in INSTALLATION,
pages 
3-64,3-73, or 3-85.
Defective RCPU Card
Refer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.SYMPTOMPROBABLE CAUSE
CORRECTWE ACTION
Cannot transfer calls to out-User error (e.g., wrong fea-Refer to m, page 4-70, for procedures.
side numbersture code)
Programming errorCheck trunk access and toll restriction.
Defective RCPU CardRefer to pages 6-l and 6-2 to test the system
voltages. Replace the card if faulty.
Page 6-24