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7-18 (=)
Checking the address
sensor
Check
while
moving
the tonearm
with
the locate switch
(Using
an oscilloscope)
Does the wave-
for
form
of J301
pin 3 resemble
the
waveform shown below?
ov COLL
ov
Check
the
connections
of
the
J301
connector assembly
The phono motor
won't start
Using the locate SW move
the tonearm
away from the rest
Is C1 pin 15 "L''?
YES
ls IC3 pin 16 "H''?
YES
is IC3 pin 10, OV?
Is Q2 C—E voitage approximately OV?
28
When the tonearm
doesn't move
The tonearm doesn't
move
Disconnect
the CN2
(female) and with
pin 1 at GND
apply 5V to pin 2. Turn
NO
the worm
gear manually. Does the wave-
form at left appear?
Check
the pattern from CN2 (male) pin
3 to IC1 pin 39
NO
Perform pattern check from 1C1 pin 15
NO
to IC3 pin 1, and mismounting R6
NO
Perform pattern check from IC3 pin 16
ue
to 7, and mismounting R7
NO
Perform error and pattern checks from
A
1C3 pin 10 to R29, R30 and Q2
Perform error and pattern checks from
Q2 to CN4
Perform check on the phono motor
(Check
the
mechanism
base
board
as-
sembly)
Check
Q304
and
R307
for
errors
and
then
check
the patterns
in
those areas
The phono motor
won't stop
Using the stop switch move the
tonearm back to the rest
is 1C1 pin 15 "H"?
YES
Is IC3 pin 16 "LL?
YES
ts 1C3 pin 10 "H"?
YES
is Q2 C—E voltage approximately 12V?
YES
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