14
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.)
(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) Blown fuse (5 A) on secondary side
(4) Faulty PCB
(1) Poor connection of (T) or (S) terminal
(2) Faulty PCB
(1) Battery connected in reverse direction
(2) Faulty battery (short-circuit, or open circuit)
(3) Faulty PCB
Typical causes
Refer to trouble mode (A).
Check procedures
Refer to trouble mode (B).
Refer to trouble mode (C).
Refer to trouble mode (D).
NO
NO
NO
NO
YES
YES
YES
YES
Pilot lamp fails to light or flash.
Apply rated voltage.
Is rated
voltage applied
to the plug ?
Is there
continuity between
the blades of the
AC cord plug ?
Is there
an open circuit in
the AC cord ?
Is the fuse
on the primary side
Blown ?
Replace PCB.
Faulty internal circuit
Replace PCB.
Replace the AC cord.
Faulty internal circuit
Check with tester.
Replace the fuse.
10-2. Troubleshooting and Repair Procedures
(1) Trouble mode (A)
Summary of Contents for UC 14YFA
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