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9.6
TROUBLE
SHOOTING
CHART
@ When Motor Fails to Rotate
Does DC 22V register bet-
ween
control circuit ass'y
(PWG-017)
Vee
and
Power
supply
ass'y
defective.
ground?
Does 10V register at pin 15
of the PA2005 IC?
Either
PA2005,
or
the
circuit
components
con-
nected
to
the
Vcc
2
terminal is defective.
Does 0.5V — 1V register |
PA2004 defective.
between
pins
16(+)
and
18(—) of PA2005?
_t
Does a voltage of approx.
1.5V register at pin 10 of
PA2005?
Is each Hall element output
terminal
voltage
approx.
4V?
turned off.
Is the resistance
between
pins 1 and 2, 1 and 3, and
2 and 3 of PA2005 approx.
68 ohms?
PA2005 defective
@
Phase Lock Failure
Check that power
supply
voltage
is DC
22V,
and
that the voltage on pin 15
of PA2005 is DC 10V.
Does
a
27.78Hz_
signal
(amplitude
10V,
pulse
width
0.66mS) register at
pin
15
of
PD1003
at
33rpm?
Measure with power supply
PA2005
defective.
Fault
lies
with
the
cor-
responding
Hall
element,
R33 — R36, or PA2005.
Defective
PTL-003 _ in
armature core ass'y.
Fault
in
x'tal
oscillator,
CR oscillator, or PD1003.
(See diagram on the right)
Does
the
normal
output
appear
at
pin
16
of
PA2004?
Poor adjustment
of the f
servo operation point.
48
defective.
Either PA2004, or C28 is
5 w
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