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X L - V 1 8 4 B K
X L - V 2 8 4 B K
Focus section
Note)
When checking the voltages between pinl and pin2 of IC801 with an
oscilloscope, do not connect the other probes.
Is the pin21,22 of
IC801 +10V?
YES
Does the pickup lens
move up and down
when the tray is
closed?
YES
NO
NO
Does the following
waveform appear at
pin32 of IC501(R505)
immediately after a disc
is loaded.
Vref
/
\
'Approx.
Approx
O.Sms
NO
^YES
Check IC401 and
associated components.
Check the power
supply circuit.
The following waveforms must
appear by observing between
pinl and pin2 of IC801. (pin2
must be the basis)
NO
Check IC801, IC601 and
associated components.
YES
Check the pickup and
the connections.
Check the pickup, IC501 and
associated components.
Tracking section
Is the pin21,22 of
IC801 +10V?
NO
Check the power
supply circuit.
Is the pin21,22 of
IC801 +10V?
Check the power
supply circuit.
YES
Does the following waveform appear at pin 26 of
IC501(R504orC506)
Vref-
Approx.
- , 8 V p p
2ms/DIV
NO
Check the pickup, IC501
and associated components.
YES
Measure DC offset ® by observing
atpin26ofIC501 i n the STOP status when
power is ON.
Then, confïrm
that the ® (the voltage of midpoint
of the amplitude of © ) is rearly
equal to the above ® by observing TP3Y™'
1 ® - ® ! £ ZOOnnV
NO
Check IC501,IC401 and
associated components.
YES
Check the pickup,
and connections.
To feed section.
Check IC601,IC801 and
associated connections.
(No. 2 0 5 0 3 ) 1-27
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