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Checking the address
sensor
When the tonearm
doesn't move
The tonearm doesn't
move
Disconnect
the CN3
(female) and with
pin 6 at GND
apply 5V to pin 5. Turn
NO
the worm
gear manually. Does the wave-
form at left appear?
YES
(Check
the
mechanism
base board
as-
sembly) Check Q301 and R302 for errors
and
then
check
the
patterns
in those
areas
Using an oscilloscope does the waveform
of JP301
pin 3 resemble the waveform
shown below?
wv JUUUUU
ov
Check
the
connections
of the JP301
connector assembly
Check the pattern from CN3 (male) pin
3 to Q1 pin 36
Using the locate SW
move
the tonearm
away from the rest
NG
Is the phono motor properly connected?
Connect it with the power OFF
OK
YES
Using the S/S SW move
the tonearm
back to the rest
NO
NO
Check the pattern from Q1 pin 10 to Q2
Is Q1 pin 10 "H''?
YES
Check th
f
Check
the
phono
motor
base
board
68
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