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« MOTOR ASSEMBLY
NOTE:
The IC PA2008
used in the PXM-090
does not have a dedicated ground pin for
its internal circuitry, but uses the thermal fan ground.
When replacing the IC, make
sure
the securing
screws
retaining
the ground
line between
the IC and
thermal
dissipator and between the thermal dissipator and motor base, and base to circuit
board is securely tightened.
e
Motor Does not Turn
are
Component
connected
to
Is Vee 1 29 volts?
Me
rh supply circus detec:
PA2008 terminal 4 defec-
YES
:
tive.
LA
ane eae term
NG
PA2008 defective.
NO
YES
Is PA2007 terminal 11 less
|no | PA2007 defective or parts
Poor PA2008 Tab terminal
than 3.5 volts?
connected
to
PA2007
to GND contact.
YES
terminal 11 defective.
®
Motor Does not Stop
Hall element
defective
or
Hall
element
bias resistor
defective.
Is Hall voltage DC bias Ha:
15-17
volts;
Hb;
4-6
volts:
When the motor is rotated
by
hand,
is Hall voltage
(Ha, Hb) generated?
If resistance
is high, coil
wire is open; if resistance
is low, PA2008 is defective
or coil is shorted.
R5_
defective
or printed
circuit open.
With
power
OFF,
is DC
resistance between PA2008
terminals 12—14 and 1—13
60 ohms?
With
power
OFF,
is DC
resistance between PA2008
terminals
7—2
3.9
ohms
YES
PA2008 defective.
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