TOA Electronics Intercom System TOAEXES 5OOO User Manual

INTERCOM SYSTEM  
TOAEXES-5OOO  
INTERCOM SYSTEM  
TROUBLE SHOOTING GUIDE  
TOA ELECTRIC CO., LTD.  
KOBE, JAPAN  
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EXES-5000 SYSTEM CHECK FLOW CHART  
START  
Table 1:  
DIP switch on CPU  
correctly set ?  
Set DIP switch  
according to Inst.  
P54  
Fig.  
Fig.  
1
2
Back-up battery on  
CPU connected ?  
Plug the Jack into  
Pin A.  
P56  
Program switch on  
CPU off ?  
Program switch off  
Power switch on  
Proper voltages at  
each output power  
terminal? (tabl 1)  
Disconnect DC power  
connection and check  
If +24V or +18V is not  
in the range, check  
power supply (DS-510).  
If +12V or +5V is not  
in the range, replace  
DC/DC inverter.  
No.15 of SCN SELECT on  
OCU lit brighter than  
others ?  
Replace CPU  
CLOCK lamp on HCU lit  
brightly ?  
Replace HCU  
Other lamps on HCU off ?  
Replace HCU OCU CPU  
Station No. lamp on LMU  
lit corresponding to  
station connected ?  
Check wiring to the  
station Replace the  
station  
LMU  
Clear all No.200  
programmings  
at any M-station  
Dial  
One of LINK BUSY lamps on  
HCU lit brightly ?  
Replace Station  
Turn on LINK SELECT switch(es) on HCU tomake  
the total number of marked number to be the  
number of LINK BUSY lamp lit. The station  
dialled correspond to ADDRESS-T lamp.  
Replace  
Dial  
SIG. CORD lamps  
On dialling  
heard ?  
dial tone  
Replace HCU; OCU CPU  
on HCU lit as Fig. 1  
momentary  
Call from any station  
to any station  
In other links, dial  
tone and lamps OK ?  
Replace SGD  
Station  
HCU  
Replace CLU or DLU  
Calling station and called  
station correspond to lamps  
lit on ADDRESS T and R  
Replace Station  
HCU  
CPU-  
SIG.CORD lamp lit as Fig.2  
Replace SGD — Station  
wiring  
Calling tone heard ?  
Two way conversation OK ?  
All other links OK ?  
Replace Station CLU or DLU  
In other links ?  
Replace CLU or DLU  
concerned  
Conversation possible  
with all station ?  
Program No.200 functions  
END  
-61-  
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8-1. FAULT IN EXCHANGE  
Before power supply check, confirm the following three  
points to eliminate elementary faults:  
1. Is voltage selector set correctly?  
2. Is AC power supplied?  
3. Is power switch ON?  
Start checking after disconnecting all wiring connected  
to DC output of the power supply unit.  
SYMPTON  
CHECK-ITEM  
Exchange does not  
operate.  
All DC output  
voltages are  
correct.  
Over-current flows into one  
of plug-in units.  
Fault in the power supply  
unit DS-510.  
All or one of  
DC output  
voltages are  
not correct.  
Right range:  
+24 ~ +30V  
Replace AC and DC fuses.  
Incorrect setting of the  
voltage selector.  
Abnormal voltage  
of +24V terminal.  
Faulty power transformer.  
Right range:  
Right range:  
Abnormal voltage  
of +18V.  
Abnormal voltage  
of +5V or +12V.  
DC/DC inverter (MIV-02) is  
defective.  
Check the cur-  
rent flowing  
into the bat-  
tery.  
Replace PCB of charging  
circuitry.  
Battery is not  
charged.  
Right range:  
Replace PCB of charging  
circuitry.  
AC & DC operation  
lamps are OFF.  
Buzzer does not  
operate.  
Check all DC  
voltage.  
Note: Only when DC  
power supply  
(Battery) is  
employed.  
Over-current flows into one  
of plug-in units.  
(Especially on +18V)  
MIV-02 is defective.  
Replacefuseaccordingto  
the following.  
Blown AC and/or  
DC fuse.  
All DC output  
voltages are  
correct.  
heck all sta-  
tions involv-  
ed in All-Call  
paging.  
Fuse  
Number of stations  
0
31  
65  
~
~
30  
64  
DC 5A  
DC 7A  
DC 10A  
~
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8-2. HOW TO FIND SHORT BETWEEN T-LINE AND R-LINE  
If the shorted condition between T-line and R-line is not  
corrected for a long time, it may burn out the guard re-  
sistor (330 , 1/2W) on the LMU board. Therefore, find  
the shorted line according to the following procedure:  
1. Turn off the privacy switch on all stations in the  
system.  
2. Turn on the power switch of the system for several  
seconds, then, turn it off.  
3. Watch the lamps on the LMU panels. The lamps on  
normal lines will go off after approximately 0.5  
second. The lamps on the shorted lines will stay  
on more than 0.5 second.  
OFF  
Power ON  
Lamp ON  
Lamp ON  
Normal  
Abnormal  
(Short)  
(Brighter than normal)  
Lamp goes off gradually  
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1. One of transmitting lines (T-Line) is disconnected.  
Station  
EXCHANGE  
Symptom 1-1 A can make dialing.  
1-2 A can hear B .  
B can not hear A .  
1-4 Noise is heard at B .  
1-3  
Noise increases at B when Press-To-Talk bar is  
pressed at A .  
1-5  
Normal  
LMU Lamps  
2. One of receiving lines (R-Line) is disconnected.  
EXCHANGE  
Sympton: 2-1 A can make dialing without dialing tone.  
2-2 When B dials A , busy tone or dial tone will be  
heard at B immediately after the calling tone.  
LMULamps----- Normal  
-64-  
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3. T-Line and R-Line are shorted or mixed up.  
Shorted or mixed up  
EXCHANGE  
Symptom  
A can not dial.  
3-1  
3-2 Conversation is impossible between stations.  
When B dials A , noise will be heard at B  
immediately after the calling tone.  
3-3  
Brighter than normal.  
LMU Lamps  
4. T-Line and R-Line are connected conversely.  
A can not make dialing.  
Sympton: 4-1  
Conversation is impossible between stations.  
When B dials A , noise will be heard at B .  
4-2  
4-3  
Brighter than normal.  
LMU Lamps  
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8-3. FAULT IN SPECIFIC STATION ONLY  
Find the cause according to the following table if the fault  
lies with a specific station only, not with all stations.  
CAUSE  
CHECK-ITEM  
Dialing can not  
be made at privacy  
off mode.  
Disconnection of both T & R-Lines.  
Guard resistor 330 on LMU is  
burned out due to T & R-Lines  
short.  
LMU Lamp is  
off.  
T & R-Lines are shorted.  
Specific Lamp  
on LMU is  
brighter than  
normal.  
Fault in the station.  
(Replace PCB board.)  
LMU Lamp is  
on in normal.  
Replace the  
station and  
make sure that  
the station  
Specific key does  
not operate.  
Fault in key board switch or  
matrix circuitry.  
Fault in the dial generator.  
(Replace PCB board.)  
is not faulty.  
Short or open in R-Line.  
Fault in the demodulation cir-  
cuitry on LMU.  
Calling tone can  
not be heard.  
Same sympton  
remains even  
if the station  
is replaced.  
Dialing tone can  
not be heard on  
dialing.  
(Check LM-380, MT-547.)  
Disconnection of R-Line or im-  
proper connection of the station  
connector.  
Fault in MT-547 on LMU.  
Station fault.  
Becomes normal  
if the station  
is replaced.  
Sound from the  
other party can  
not be heard.  
Same sympton  
remains even  
the station  
is replaced.  
Short or open in T-Line.  
Fault in the modulation cir-  
cuitry on LMU.  
Sound is not trans-  
mitted to the other  
party.  
Fault in MIC circuitry of the  
station. (Replace MIC or PCB)  
Becomes normal  
if the station  
is replaced.  
On dialing, noise  
is heard by the  
called party.  
One of T-Lines is disconnected.  
Same sympton  
remains even  
the station is  
replaced.  
Fault in MIC element.  
Fault in T-Line of the station.  
Low frequency oscillation of  
MIC AMP. (Faulty bypass capaci-  
tor)  
Becomes normal  
if the station  
is replaced.  
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Same symptom  
remains even  
the station  
is replaced.  
Adjust the volume control of  
station speaker if the room  
produces reverberation.  
(Lower the volume.)  
Increase the gain of MIC AMP.  
Replace PCB after checking if  
MIC unit is not touching its  
case.  
Sound of the other  
party is broken  
during call.  
Same symptom  
remains even  
the station  
is replaced.  
One of R-Lines is disconnected.  
Fault in photo coupler PC-504  
onLMU.  
Fault in MT-547 on LMU or in  
the station.  
Immediately after  
the calling tone,  
the line switches  
to cancel, busy,  
dial tone, etc.  
One of the R-Lines is discon-  
nected or the station connector  
is not connected properly.  
Becomes normal  
if the station  
is replaced.  
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8-4. SPEECH AND FUNCTION TEST  
1. Speech Test  
After completing the wiring check and the power supply  
and exchange test according to the system flow chart,  
the speech test for each station can then take place.  
IMPORTANT NOTE  
Before testing, all programming (Secretary transfer,  
Master/Substation, Executive Priority Function) must  
be cleared from station No.200 by turning on the PRO-  
GRAM switch of the CPU, or the speech test can not  
proceed correctly.  
Call every station one by one from any master station  
and examine the speech quality and sound volume.  
The sound volume can be adjusted by the volume on the  
rear of the station. (Fully clockwise for maximum)  
A call to a station in the room produces reverbera-  
tion and may present broken sound. Turn down the  
volume of the station speaker until the sound becomes  
normal.  
Each station must be located properly where no feed-  
back will occur between station and external speakers.  
The gain adjustment of the paging amplifier is also  
important in order to avoid troublesome feedback.  
The Press-To-Talk bar on the station keyboard must be  
used for the speech test when stations are installed  
in high noise areas (more than 60dB noise).  
Speech quality (broken sound, natural conversation,  
tone quality, etc.) must be tested with each line in  
the CLU or DLU employed in the system.  
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2. Function Test  
Check all employed functions with a few stations near  
the exchange.  
Check "User Programmable Functions" at stations in-  
volved after the programming from station 200.  
Secretary Transfer: Is transfer made correctly  
with the privacy switch on  
at the executive station.  
Master/Substation : Touch dial  
at substation  
can call its master station.  
Executive Priority: Is this function operated at  
stations involved.  
Use all number keys including  
and  
, Press-  
To-Talk bar, Vol. L/H and privacy switch to test  
all functions.  
EXAMPLE:  
Both calling and conversation tests with  
station number 200 through 209.  
Change the position of Vol. L/H and make  
sure that the switch works.  
Turn the privacy switch ON. Is privacy  
tone heard from the station when some-  
onecalls?  
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MEMO  
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