TM 55-1930-209-14&P-12
4.3 Trouble Shooting Outline
4.3.1 Horn Blows Improperly
Symptom
Cause
Maintenance
Horn draws near normal
Broken coil
Replace diaphragm and
current, has very low out-
coil unit 9055 0010
put; noise has screeching
tone
Horn draws high current;
Indicates friction.
Realign diaphragm
has low output, tone is
Rubbing coil.
and coil unit
normal
Horn draws normal current,
Defective oscillator
Replace oscillator -
has normal output;
P.C. Board Assembly
Board Assembly
frequency changes rapidly,
9045 0103 or
9045 0275
noise is a warbling type
9045 0105
Horn draws low current;
Applied battery
1. Re-adjust battery
has low output, tone is
voltage below
voltage.
normal.
specification.
2. Readjust regulator
Horn draws high current;
1. Applied battery
1. Readjust battery
has high output, tone is
voltage above
voltage.
normal
specified maximum
2. Readjust regulator.
2. Regulator defective
3. Repair program timer
Horn draws normal current,
program timer not
or replace regulator,
has normal output, tone
working properly.
DSC Assy. 9010-0144
is normal. Horn's blast
is periodical. (Does not
keep within the specified
on-off timing)
Form No. 6310 0238
