TOA Electronics TOAEXES-5OOO User Manual

Loading...

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.

-60-

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

-61-

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

-62-

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

-63-

+ 9 hidden pages