Toa TOAEXES-5OOO Manuel utilisateur

TOAEXES-5OOO

INTERCOM SYSTEM

TROUBLE SHOOTING GUIDE

TOA ELECTRIC CO., LTD.

KOBE, JAPAN

INTERCOM SYSTEM

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 fol-

lowing 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.

Same symptom in every station. Fault in specific station

only.

Fault in an exchange. Cable fault. Fault in a station.

Power supply

Plug-in unit

(Common control)

Back wiring on

frame

Mis-wiring between exchange

and terminal board.

Mis-wiring such as short,

broken wire, etc.

Misconnection in station

jack.

Key board switch fault.

Board assembling fault.

Speaker, microphone fault.

Microswitch

connecting

cable fault.

-60-

EXES-5000 SYSTEM CHECK FLOW CHART

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

Set DIP switch

according to Inst.

Plug the Jack into

Pin A.

Program switch off

Disconnect DC power

connection and check

at any M-station

Dial

One of LINK BUSY lamps on

HCU lit 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.

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

Replace Station

Dial SIG. CORD lamps

on HCU lit as Fig. 1

momentary

In other links, dial

tone and lamps OK ?

Replace CLU or DLU

Replace HCU;

OCU

CPU

Replace SGD

HCU

Station

Replace Station

CPU-

HCU

Replace SGD — Station

wiring

In other links ?

Replace CLU or DLU

concerned

Program No.200 functions

Replace Station

CLU or DLU

Table 1:

Fig.

P54

P56

If +24V or +18V is not

in the range, check

power supply (DS-510).

+12V

or +5V is not

in the range, replace

DC/DC inverter.

Replace

Check wiring to the

station

Replace the

LMU

Replace HCU

OCU

CPU

Replace CPU

-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 O N ?

Start checking after disconnecting all wiring connected

to DC output of the power supply unit.

SYMPTON

CHECK-ITEM

Over-current flows into one

of plug-in units.

Fault in the power supply

unit DS-510.

Exchange does not

operate.

All DC output

voltages are

correct.

All or one of

DC output

voltages are

not correct.

Abnormal voltage

of +24V terminal.

Right range:

+24 ~ +30V

Replace AC and DC fuses.

Incorrect setting of the

voltage selector.

Faulty power transformer.

DC/DC inverter (MIV-02) is

defective.

Replace PCB of charging

circuitry.

Abnormal voltage

+18V.

Abnormal voltage

of +5V or

+12V.

Battery is not

charged.

Right range:

Check the cur-

rent flowing

into the bat-

tery.

Right range:

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.

Replace PCB of charging

circuitry.

All DC output

voltages are

correct.

heck all sta-

tions involv-

ed in All-Call

paging.

Over-current flows into one

of plug-in units.

(Especially on +18V)

MIV-02 is defective.

Replacefuseaccordingto

the following.

Number of stations

0~ 30

31 ~ 64

65~

Fuse

DC 5A

DC 7A

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.

Normal

Abnormal

(Short)

Lamp goes off gradually

Power ON

Lamp ON

(Brighter than normal)

OFF

-63-

1. One of transmitting lines (T-Line) is disconnected.

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

Station

EXCHANGE

Symptom

1-1

1-2

1-3

1-4

1-5

A can make dialing.

A can hear B .

B can not hear A .

Noise is heard at B .

Noise increases at B when Press-To-Talk bar is

pressed at A .

LMU Lamps Normal

2. One of receiving lines (R-Line) is disconnected.

-64-

3. T-Line and R-Line are shorted or mixed up.

Symptom

3-1

3-2

3-3

A can not dial.

Conversation is impossible between stations.

When B dials A , noise will be heard at B

immediately after the calling tone.

LMU Lamps

Brighter than normal.

4. T-Line and R-Line are connected conversely.

Sympton:

4-1

4-2

4-3

A can not make dialing.

Conversation is impossible between stations.

When B dials A , noise will be heard at B .

LMU Lamps

Brighter than normal.

Shorted or mixed up

EXCHANGE

-65-

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.

CHECK-ITEM

Dialing can not

be made at privacy

off mode.

LMU Lamp is

off.

Specific Lamp

on LMU is

brighter than

normal.

LMU Lamp is

on in normal.

Specific key does

not operate.

Replace the

station and

make sure that

the station

is not faulty.

Calling tone can

not be heard.

Dialing tone can

not be heard on

dialing.

Sound from the

other party can

not be heard.

Same sympton

remains even

if the station

is replaced.

Becomes normal

if the station

is replaced.

Sound is not trans-

mitted to the other

party.

Same sympton

remains even

the station

is replaced.

Becomes normal

if the station

is replaced.

On dialing, noise

is heard by the

called party.

Same sympton

remains even

the station is

replaced.

Becomes normal

if the station

is replaced.

T & R-Lines are shorted.

Fault in the station.

(Replace PCB board.)

Fault in key board switch or

matrix circuitry.

Fault in the dial generator.

(Replace PCB board.)

Short or open in R-Line.

Fault in the demodulation cir-

cuitry on LMU.

(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.

Short or open in T-Line.

Fault in the modulation cir-

cuitry on LMU.

Fault in MIC circuitry of the

station. (Replace MIC or PCB)

One of T-Lines is disconnected.

Fault in MIC element.

Fault in T-Line of the station.

Low frequency oscillation of

MIC AMP. (Faulty bypass capaci-

tor)

CAUSE

Disconnection of both T & R-Lines.

Guard resistor 330 on LMU is

burned out due to T & R-Lines

short.

-66-

Sound of the other

party is broken

during call.

Same symptom

remains even

the station

is replaced.

Immediately after

the calling tone,

the line switches

to cancel, busy,

dial tone, etc.

Same symptom

remains even

the station

is replaced.

Becomes normal

if 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.

One of R-Lines is disconnected.

Fault in photo coupler PC-504

LMU.

Fault in MT-547 on LMU or in

the station.

One of the R-Lines is discon-

nected or the station connector

is not connected properly.

-67-

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.

-68-

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