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14.8 SOUND FAILURE
14.9 ADDRESS SENSOR CHECK
Address sensor check
There's no sound.
Check the amplifier functions and
the speaker and PU cord connections.
OK
Check the soldering on PU base
board and then check the carriage
base board.
OK
Check the connections from the cart
ridge unit to the PU cord.
OK
Check the cartridge.
OK
Change the stylus.
When the tonearm doesn't move.
Move the tonearm with the locate ----------------------.i
switch.
•
(using an oscilloscope)
Do the fol-
lowing pulse
waveforms
appear at
With CN3 (female) removed, and 5
JP301 pin 3?
NO
applied to pin 5 and an external GND
�
applied to pin 6, do the waveforms
sv
JlIUlnIU
at left appear when the worm gear ,s
OV
moved manually?
YES
YES
'
I
Do they appear at 01 pin 26 also?
NO
Check the pattern from CN3
(male)
pin 3 to 01 pin 26.
YES
I
OK
See 14.6 "Tonearm movement"
(Check
the mechansim base board
assembly) Perform error, pattern and
soldering checks around 0301, and
R302.
45