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IHall element output waveforms]
A.
Normal wav.form
3 o o m V p - p { m a x . )
Approx. DC 4V
B.
Low outprrt wav€forrn {AC outpuil
Below 30OmVpf
+ff:re
PL-L1 clclcl
C.
Exampl6
of dinort6d
wav€form
(bul normsl output
levol)
E x . 1
Motor runaway
Is there a 10V output
pin ( 15) of PA2005?
Defective PA2005 or sur-
rounding component
Is there a 55.5H2 square
wave signal on pin (5) of
PA2004 when the motor
speed is held to 33-1/3rpm
by hand ?
Defective wiring, or de-
fective speed detector cir-
cuit board
Is there an input from the
FG circuit board?
Defective PA2004 or de-
fective R3, R4 C6- C8
component
Is there a 55.5H2 square
wave signal on pin (10)
of PA2004 when the mo-
tor is held to the same
speed (33-1/3rpm) in the
While measuring the volt-
age between pins (12) (-)
and (14) (+) of PA2004
with the motor stopped bY
hand, let the motor speed
(rpm) increase gradually.
Does
the
voltage vary
gadually
from
-0.5
to
+2V ?
Is there a 27 ,7 8Hz signal
(at 33-1/3rpm)
on pin
( 1 5 ) o f P D 1 0 0 3 ?
Defective PD1003
Defective
PA2OO4
related component
Is there any abnormality
in the waveforms observed
in the oscilloscope (see ac-
companying
diagrams)
when measuring the wave-
forms at each of the Hall
element output terminals
while keeping the motor
speed steady at
33-1/
3 m m ?
Defective Hall element or
Hall element resistance
E X . 2
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