Troubleshooting Guide; Troubleshooting Based On Pilot Lamp Indications; Troubleshooting And Repair Procedures - Hitachi UC 18YML2 Technical Data And Service Manual

10. TROUBLESHOOTING GUIDE

10-1. Troubleshooting Based on Pilot Lamp Indications

Phenomenon
Pilot lamp fails to light or flash.
Red pilot lamp does not stay lit
(continues to flicker) after battery
has been connected.
Pilot lamp remains green (red
fails to light) after battery has
been connected.
Pilot lamp indicates abnormality
by flashing red rapidly (at 0.2
second intervals.)

10-2. Troubleshooting and Repair Procedures

(1) Trouble mode (A)
Pilot lamp fails to light or flash.
Is rated voltage
applied to the plug?
Check with tester.
Is there continuity
between blades of
the AC cord plug or
the cigarette lighter
cord?
Faulty internal circuit
Replace the PCB.
(1) Faulty AC cord or cigarette lighter cord
(2) Blown fuse (3.15 A) on primary side
(1) Poor connection of (T) or (LS)
terminal
(2) Faulty battery (open circuit)
(3) Faulty PCB
(1) Poor connection of (T) or (LS)
terminal
(2) Faulty PCB
(1) Faulty battery
(short-circuit, or open circuit)
(2) Faulty PCB
NO
Apply rated voltage.
YES
NO
YES
Replace the fuse.
Typical cause
Is there an open
circuit in the AC cord
or cigarette lighter
cord?
YES
Is the fuse on the
primary side blown?
Faulty internal circuit
Replace the PCB.
-14-
Check procedure
Refer to trouble mode (A).
Refer to trouble mode (B).
Refer to trouble mode (C).
Refer to trouble mode (D).
YES
Replace the AC
cord or cigarette
NO
lighter cord.
NO