Troubleshooting Guide; Troubleshooting Based On Pilot Lamp Indications; Troubleshooting And Repair Procedures - Hitachi uc 24yfb 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.
Check with tester.
(1) Faulty AC cord
(2) Blown fuse (3.15 A) on primary side
(1) Poor connection of (T) or (S) terminal
(2) Faulty battery (open circuit)
(3) Faulty PCB
(1) Poor connection of (T) or (S) terminal
(2) Faulty PCB
(1) Faulty battery (short-circuit, or open circuit)
(2) Faulty PCB
Is rated
NO
voltage applied
to the plug ?
YES
Is there
continuity between
NO
the blades of the
AC cord plug ?
YES
Faulty internal circuit
Replace PCB.
Replace the fuse.
Typical causes
Apply rated voltage.
Is there
an open circuit in
the AC cord ?
NO
Is the fuse
YES
on the primary side
Blown ?
NO
NO
Faulty internal circuit
Replace PCB.
15
Check procedures
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.