Hitachi UC 9SD Technical Data And Service Manual page 10

(1) Failure Mode (A) Steps and Repair Procedures
Follow proper
charging procedures.
Remove dirt or
correct abnormality.
Charge at appropriate
temperature.
10 C --- 40 C
(50 F --- 104 F)
Battery cannot be
charged if over
40 C (104 F).
Cool battery before charging.
Check with tester.
Pilot Lamp on,
Charger does not go on.
NO Is battery charged
according to proper
procedures ?
YES
Are connection
YES
terminals on Charger
or battery dirty,
deformed or
abnormal?
NO
Is the
temperature range
NO
appropriate for charging?
10 C --- 40 C
(50 F --- 104 F)
YES
YES
Is the battery
too hot?
NO
What is the
voltage of the battery
between the (+) and (-)
terminals and (+) and
(T) terminals?
DC 0 V
Battery is defective.
Replace battery.
Defective Charger
Is there
continuity between
the blades of the
AC Plug?
YES
Is the fuse on
the secondary side
blown?
NO
Is there a
disconnected lead
wire on the secondary
side?
NO
DC 9.6 V
Printed Circuit Board
is defective.
Replace Printed
Circuit Board.
--- 8 ---
Circuit break
Is there a break
in the Cord?
NO
NO
Replace Transformer.
Thermal fuse on
primary side of
Transformer is melted.
Replace Cord.
YES
Replace fuse.
* 7.2 V batteries cannot
be charged.
YES
Replace Transformer.
YES