TOA Electronics TOAEXES-5OOO User Manual
INTERCOM SYSTEM
TOA EXES-5OOO
INTERCOM SYSTEM
TROUBLE SHOOTING GUIDE
TOA ELECTRIC CO., LTD.
KOBE, JAPAN
8. TROUBLE SHOOTING GUIDE
Repairing of the EXES-5000 system is basically done by
replacing defective units with goo d ones. The system's
faults in an installation can be divided into the following categories.
1. Faults in an exchange
2. Faults in a station
3. Cable faults
To make system repairing easier, find which category is
involved, then refer to the chart below for assistance
in fault finding.
All stations do n o t operate.
Same symptom in every station.
Fault in an exchange.
Cable fault. Fault in a station.
Power supply
Plug-in unit
(Common control)
Back wiring on
frame
Fault in specific station
only.
Mis-wiring between exchange
and terminal board.
Mis-wiring such as short,
broken wire, etc.
Misconnection in station
jack.
Ke y b o ar d switch fault.
Board assembling fault.
Speaker, microphone fault.
Microswitch
,
connecting
cable fault.
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START
DIP switch on CPU
correctly set ?
Back-up battery on
CPU connected ?
Program switch on
CPU off ?
Power switch on
EXES-5000 SYSTEM CHECK FLOW CHART
Set DIP switch
according to Inst.
Plug the Jack into
Pin A.
Program switch o ff
P54
P56
Table 1:
Fig.
1
Fig.
2
Proper voltages at
each output power
terminal? (tabl 1)
No.15 of S CN SELECT on
OCU l i t brighter than
others ?
CLOCK lamp on HCU lit
brightly ?
Other lamps on HCU off ?
Station No. lamp on LMU
li t corresponding to
station connected ?
Clear all No.200
programmings
Dial
One o f LINK BUSY lamps on
HCU li t brightly ?
Turn on LINK SELECT switch(es) on HCU to make
the total number of marked number to be the
number of LINK BUSY lamp lit. The station
dialled correspond to ADDRESS-T lamp.
at an y M-station
Disconnect DC power
connection and check
Replace CPU
Replace HCU
Replace HCU
Check wiring to the
station
station
Replace Station
OCU
Replace the
LMU
Replace
CPU
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.
On dialling dial tone
heard ?
Call from any station
to any station
Calling station and called
station correspond to lamps
lit on ADDRESS T and R
SIG.CORD lamp lit as Fig.2
Calling tone heard ?
Two way conversation OK ?
All other links OK ?
Conversation possible
with all station ?
END
Dial
SIG. CORD lamps
on HCU lit as Fig. 1
momentary
In other links, dial
tone and lamps OK ?
Replace Station
Replace SGD — Station
wiring
In other links ?
Replace CLU or DLU
concerned
Program No.200 functions
CPU-
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HCU
Replace HCU;
Replace SGD
Replace CLU or DLU
Replace Station
OCU
HCU
CPU
Station
CLU or DLU
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 O N ?
Start checking after disconnecting all wiring connected
t o D C output of the power supply unit.
SYMPTON
Exchange does n o t
operate.
Abnormal voltage
of +24V terminal.
Abnormal voltage
of
+18V.
Abnormal voltage
of +5V or
+12V.
Battery is not
charged.
CHECK-ITEM
All DC output
voltages are
correct.
All or one of
DC output
voltages are
not correct.
Right range:
+24 ~ +30V
Right range:
Right range:
Check the cur-
rent flowing
into the battery.
Right range:
Over-current flows into one
of plug-in units.
Fault in the power supply
unit DS-510.
Replace AC and DC fuses.
Incorrect setting of the
voltage selector.
Faulty power transformer.
DC/DC inverter (MIV-02) i s
defective.
Replace PCB of charging
circuitry.
AC & DC operation
lamps are OFF.
Buzzer does not
operate.
Note: Only when DC
power supply
(Battery) is
employed.
Blown AC and/or
DC fuse.
Check all DC
voltage.
All DC output
voltages are
correct.
heck all sta-
tions involv-
ed in All-Call
paging.
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Replace PCB of charging
circuitry.
Over-current flows into one
of plug-in units.
(Especially on +18V)
MIV-02 is defective.
Replace fuse according to
the following.
Number of stations
0 ~ 30
31 ~ 64
65
~
Fuse
DC 5A
DC 7A
DC 10A
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 th e 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 t he 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 o n the shorted lines will stay
on more than 0.5 second.
Power ON
Lamp ON
Lamp ON
(Brighter than normal)
OFF
Normal
Abnormal
(Short)
Lamp goes off gradually
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