Troubleshooting Guide; Troubleshooting Based On Pilot Lamp Indications; Troubleshooting And Repair Procedures - Hitachi uc 24yj Technical Data And Service Manual

10. TROUBLESHOOTING GUIDE

10-1. Troubleshooting Based on Pilot Lamp Indications

Phenomenon
The charge time lamp and the
charge status lamp fail to light.
The charge time lamp does not
light red or orange or green
continuously or does not flash
red when a battery is inserted.
The charge status lamp flashes
orange rapidly (in 0.2-second
intervals) when a battery is
inserted.

10-2. Troubleshooting and Repair Procedures

(1) Trouble mode (A)
The charge time lamp and the
charge status lamp fail to light.
Check with tester.
Varistor damaged by incorrect
connection of high voltage
power supply.
Replace the varistor and the
fuse on the primary side.
(1) Faulty AC cord
(2) Blown fuse (5 A) on primary side
(3) Life of relay in case (B) ass'y (circuit board
ass'y) ended.
(1) Poor contact of terminal
(2) Faulty battery (broken)
(3) Faulty case (B) ass'y (circuit board ass'y)
Is there continuity
between the blades of the
AC cord plug?
YES
About 500 KΩ
Faulty internal circuit
Replace case (B) ass'y.
YES
resistance is 100Ω or less between
Typical cause
NO
YES
Is the
varistor damaged?
(It is damaged if the
the internal wires of
the varistor.)
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Checking procedure
Refer to trouble mode (A).
Refer to trouble mode (B).
Is there a
YES
break in the AC
cord?
Replace the AC cord.
NO
Is the fuse
on the primary
side blown?
NO
NO
Faulty internal circuit
Replace case (B) ass'y.