TOA Electronics TOAEXES-5OOO manual Is voltage selector set correctly?

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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