TOA Electronics TOAEXES-5OOO User Manual

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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