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) i s
defective.
Replace PCB of charging
circuitry.
Abnormal voltage
of
+18V.
Abnormal voltage
of +5V or
+12V.
Battery is not
charged.Right range:
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.
Replace fuse according to
the following.
Number of stations
0 ~ 30
31 ~ 64
65 ~
Fuse
DC 5A
DC 7A
DC 10A
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