JVC KD-DV4200J, Руководство по обслуживанию

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1-32 (No.MA248)
5.3 Spindle section
5.4 Tracking section
Is the disk rotated?
NO
YES
Is the voltage output at
pin 20,pin22 and pin 22
of IC251?
Does the RF signal appear
at pin 111 of IC301?
YES
Check the spindle motor
and its wiring.
Is the RF waveform at
pin 111 of IC301 distorted?
Proceed to the Tracking
section. Check the circuits in
the vicinity of IC301
or the pickup.
YES
NO NO
YES
NO
Is the voltage input at pin
17 of IC251?
YES
NO
Is the voltage output at
pin 76 of IC301?
Check the connections
between IC201 and
IC301.
YES
NO
Is the power supply
present at pin 14
of IC251?
YES
Check IC501.
NO
Check the connections
of D5V power supply.
YES
Is the power supply
present at pin 15
and pin 25 of IC501?
NO
Check the connections
of M8V power supply.
YES
Check IC301.
Is the power supply
present at pin 6
of IC301?
NO
Check the connections
of D3.3V power supply.
Is the power supply
present at pin 6
of IC301?
NO
Check the connections
of D3.3V power supply.
Is the voltage input at pin
6 of IC201?
YES
NO
Is the voltage output at
pin 147 of IC301?
NO
YES
Check the connections
between IC201 and
IC301.
Is the power supply
present at pin 19
and pin 28 of IC201?
YES
Check IC201.
NO
Check the connections
of M8V power supply.
YES
Is the power supply
present at pin 10
of IC201?
NO
Check the connections
of M5V power supply.
YES
Check IC301.