INTERCOM SYSTEM
TOAEXES-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 good 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 |
not operate. |
Fault |
in specific station |
Same symptom in |
every station. |
only. |
|
Fault in an exchange. Cable fault. Fault in a station.
Power supply |
Mis-wiring between exchange |
|
Plug-in unit |
and terminal board. |
|
(Common control) |
Mis-wiring such as short, |
|
Back wiring on |
broken wire, |
etc. |
frame |
Misconnection |
in station |
|
jack. |
|
Key board 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
Proper voltages at each output power terminal? (tabl 1)
No.15 of SCN SELECT on OCU lit brighter than others ?
CLOCK lamp on HCU lit brightly ?
Other lamps on HCU off ?
Station No. lamp on LMU lit corresponding to station connected ?
Clear all No.200 programmings
Dial |
at any M-station |
EXES-5000 SYSTEM CHECK FLOW CHART
Set DIP |
switch |
|
according to Inst. |
P54 |
|
|
|
|
Plug the |
Jack into |
|
Pin A. |
|
P56 |
|
|
|
Program |
switch off |
|
Disconnect DC power connection and check
Replace CPU
Replace HCU
Replace HCU OCU CPU
Check wiring to the station Replace the station LMU
One of LINK BUSY lamps on
Replace Station
HCU lit brightly ?
Turn on LINK SELECT switch(es) on HCU to make
the total number of marked number to be the
Replace
number of LINK BUSY lamp lit. The station dialled correspond to ADDRESS-T lamp.
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 CPUHCU
Replace SGD — Station wiring
In other links ?
Replace CLU or DLU concerned
Program No.200 functions
Table 1:
Fig. 1
Fig. 2
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.
Replace HCU; OCU CPU
Replace SGD HCU Station
Replace CLU or DLU
Replace Station CLU or DLU
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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 |
All DC output |
Over-current flows into one |
|
operate. |
voltages are |
of plug-in units. |
|
|
correct. |
|
|
|
All or one of |
Fault in the power supply |
|
|
DC output |
unit DS-510. |
|
|
voltages are |
|
|
|
not correct. |
|
|
Abnormal voltage |
Right |
range: |
Replace AC and DC fuses. |
of +24V terminal. |
+24 ~ +30V |
Incorrect setting of the |
|
|
|
|
voltage selector. |
|
|
|
Faulty power transformer. |
Abnormal voltage |
Right |
range: |
|
of +18V. |
|
|
|
Abnormal voltage |
Right |
range: |
DC/DC inverter (MIV-02) is |
of +5V or +12V. |
|
|
defective. |
Battery is not |
Check |
the cur- |
Replace PCB of charging |
charged. |
rent |
flowing |
circuitry. |
|
into |
the bat- |
|
|
tery. |
|
|
|
Right |
range: |
|
AC & DC operation |
Check all DC |
|
lamps |
are OFF. |
voltage. |
Buzzer |
does not |
|
operate.
Note: Only when DC power supply (Battery) is employed.
Blown AC and/or |
All DC output |
|
DC fuse. |
voltages are |
|
|
correct. |
|
|
heck |
all sta- |
|
tions |
involv- |
|
ed in All-Call |
|
|
paging. |
Replace PCB of charging circuitry.
Over-current flows into one of plug-in units.
(Especially on +18V)
MIV-02 is defective. Replacefuseaccordingto the following.
Number of stations |
Fuse |
0 ~ 30 |
DC 5A |
31 ~ 64 |
DC |
7A |
65~ |
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.
Power ON |
OFF |
|
Normal |
Lamp ON |
Abnormal |
|
|
|
(Short) |
Lamp ON |
|
(Brighter |
than normal) |
|
Lamp goes off gradually |
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