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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MEMO
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TOA ELECTRIC CO., LTD.
KOBE, JAPAN
Printed in Japan
EX5(7)-01R(79-2)
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