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Motor Runaway
Check
that
the
power
supply voltage is DC 22V.
[ Defective
element
is PA- |
2004, R21, R22, C21, or
C22.
Check that the voltage on |
pin 15 or PA2005 is 10V.
Rotate the turntable man-
[ Does the FG circuit board |
ually at 38rpm.
Does a
input register about ImV
55.5Hz square wave signal
rms? (Check note 1).
register at pin 5 of PA2004?
|
Again rotate the turntable 7
manually at 33rpm. Does a
-
55.5Hz square wave signal
—
PA2005 defective
register at pin 10 of PA-
2004?
Stop
the
turntable
from
rotating, and measure
the
voltage between pins 12(—)
and
14(+)
of
PA2004.
Start the turntable moving
by
hand,
and
slowly
in-
crease the rotational speed.
Does
the voltage
reading
gradually
increase
from
—0.5 to +2V?
Does
a
27.78Hz_
signal
register
at
pin
15
of
PD1008 for 33rpm?
Either PA2004 is defective,
or
a related
circuit
com-
ponent is defective.
PA2004 defective
|
*Note 1.Connect a 100uV/10V capacitor between
TP22
and ground.
PL-630
Problem
due
to
either
defective
wiring,
or a de-
fective speed detector ass'y.
PD1008 defective.
49
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