TOA Electronics TOAEXES-5OOO User Manual

115.12 Kb
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-

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

Station

 

 

 

EXCHANGE

Symptom 1-1

A

can make dialing.

1-2

A

can hear

B .

 

 

1-3

B

can not hear

A .

1-4

Noise

is heard at

B .

1-5

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.

 

 

 

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-

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

Shorted or mixed up

 

EXCHANGE

Symptom 3-1

A can not dial.

3-2

Conversation is impossible between stations.

3-3

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

A can not make dialing.

4-2

Conversation is impossible between stations.

4-3

When B dials

A , noise will be heard at B .

LMU Lamps

Brighter

than normal.

-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

CAUSE

Dialing can not

LMU Lamp is

Disconnection of both T & R-Lines.

be made at privacy

off.

Guard resistor 330 on LMU is

off mode.

 

burned out due to T & R-Lines

 

 

short.

Specific key does not operate.

Calling tone can not be heard.

Dialing tone can not be heard on dialing.

Sound from the other party can not be heard.

Sound is not transmitted to the other party.

On dialing, noise is heard by the called party.

Specific Lamp

T & R-Lines are shorted.

on

LMU is

 

brighter

than

 

normal.

 

 

LMU Lamp

is

Fault in the station.

on in normal.

(Replace PCB board.)

Replace the

Fault in key board switch or

station

and

matrix circuitry.

make sure that

Fault in the dial generator.

the station

(Replace PCB board.)

is not faulty.

 

Same sympton

Short or open in R-Line.

remains even

Fault in the demodulation cir-

if the station

cuitry on LMU.

is replaced.

(Check LM-380, MT-547.)

Becomes normal

Disconnection of R-Line or im-

if

the station

proper connection of the station

is replaced.

connector.

 

 

 

Fault in MT-547 on LMU.

 

 

 

Station fault.

Same sympton

Short or open in T-Line.

remains

even

Fault in the modulation cir-

the station

cuitry on LMU.

is replaced.

 

Becomes normal

Fault in MIC circuitry of the

if

the station

station. (Replace MIC or PCB)

is replaced.

 

Same sympton

One of T-Lines is disconnected.

remains

even

 

the

station is

 

replaced.

 

Becomes normal

Fault in MIC element.

if

the station

Fault in T-Line of the station.

is

replaced.

Low frequency oscillation of

 

 

 

MIC AMP. (Faulty bypass capaci-

 

 

 

tor)

-66-

Sound

of

the

other

Same symptom

Adjust the volume control of

party

is

broken

remains even

station speaker if the room

during call.

 

the

station

produces reverberation.

 

 

 

 

is

replaced.

(Lower the volume.)

 

 

 

 

 

 

Increase the gain of MIC AMP.

 

 

 

 

 

 

Replace PCB after checking if

 

 

 

 

 

 

MIC unit is not touching its

 

 

 

 

 

 

case.

Immediately

after

Same symptom

One of R-Lines is disconnected.

the calling

tone,

remains even

Fault in photo coupler PC-504

the line switches

the

station

on LMU.

to cancel, busy,

is

replaced.

Fault in MT-547 on LMU or in

dial tone, etc.

 

 

the station.

 

 

 

 

Becomes normal

One of the R-Lines is discon-

 

 

 

 

if

the station

nected or the station connector

 

 

 

 

is

replaced.

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-

2.Function Test

Check all employed functions with a few stations near the exchange.

Check "User Programmable Functions" at stations involved 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-

one calls?

-69-

MEMO

MEMO

TOA ELECTRIC CO., LTD.

KOBE, JAPAN

Printed in Japan

EX5(7)-01R(79-2)