Pioneer PL-L70 Service Manual page 49

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Note:
@
When
the tonearm
is on
the rest it will not go UP or
DOWN.
e
Also,
disconnect
the
cord
leading
to
the
fader
deck
(CT-Z99W).
The EV doesn't perform
Place a record on the turntable and using
the locate
switch, move
the tonearm
to
the selection position
Does the UP LED go ON and OFF when
Evsw
ON
ON
the EV SW goes ON and OFF?
a
=
foe)
foe)
YES
I
(
!
17
Tec,
Do
Q1
pins
13
and
14
alternately
NO
become
''H" and "L'' when the EV SW
is turned ON?
YES
At that time do Q3 pins 7 and 8 change
from
approximately
OV
to
approxi-
mately 8V?
NO
YES
At that time do Q3 pins 9 and 10 change
from
approximately
12V
to
approxi-
mately 1V?
NO
YES
At
that
time
were
the
D101
cathode
voltage readings as shown below?
12V
——-—-— Approximately
8V
Holding the
Approximately
Drawing the rod in
1V
YES
Unsolder the EV solenoid lead and make
sure
the
solenoid
wire wound
resistor
measures approximately 702
Faulty mechanism,
check to see
if the solenoid
plunger is catch-
ing on something
NO
YES
(Be careful
of which
direction
D201
is
facing and disconnect CN2 (female))
Is
the
resistance
approximately
702
be-
tween pins 3 and 4?
Perform
error and pattern checks from
Q3 pins 9 and 10 to R40 and CN2 pin 3
The switch doesn't work
Perform
pattern
and
soldering
checks
from
Q1 pins 13 and
14 to Q2 pins 2
and 3
Perform
pattern
and
soldering
checks
from
Q2 pins 2, 3, 14, 15, to Q3
pins
7 and 8
Perform error and
patternchecks from
Q3 pinsQ9 and 10 to
R40 and CN2 pin 3
Is CN2
properly
connected?
Perform
error, pattern
break, solde ring,
connection
checks from CN 2 (fennale)
to JP201, D201 and solenoid.
Faulty solenoid
Perform
error and pattern checks from
CN2 (female) and JP201 and D201
65

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