Pioneer pl-530 Service Manual page 35

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, 2 WI D E V AR I ATIO NS IN M OTOR S PE ED
NO
With the power ON, rotate
the
turntable slowly by
hand (about five seconds
for each complete rev.). Do
the collector voltages of Qq,
Qs, and Q12 cycle between
l and 18V?
YES
Is the voltage across R267 on
block 3 approximately con-
stant, without
significant
change?
Is the voltage between ter-
minals 4 and 6, 8, or 10
(app. 8-9V) roughly the
sarne as that between ter-
minals 4 and 7. 9. or 11?
Hall-effect element Ht (Ht
or H3) is defective.
With the power OFF, is the
resistance between terminal
5 and 1, 2, or 3 equal to
64t5O ? The plus (+) test
lead should be connected to
terminal 5.
Motor wiring is defective.
High resistance; open cir-
cuit.
Low resistance; short.
Disconnect the diodes of
block 5 (Dr, D2, and D3)
and check them with a test
mef,er.
Are they conductive in for-
ward direction, or non-
conductive in backwards
diection?
Defeetive diode.
Even if only one diode
proves to be defective, the
complete setof three should
be replaced.
Check each of the voltages
in block 4.
Are the values incorrect?
Block 3 is defective.
Shaft or bearings defective.
IE
N O