Denon Professional DN-F300, Руководство по обслуживанию

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7
DN-F300
FLOW CHART NO.3
䇭
(CONTROL UNIT)
FLOW CHART NO.4
䇭
(MAIN/POWER UNIT)
䇭 The key operation is not functioning.
䇭 Both functions of picture and sound do not operate
The WAV file in which test signal of 1kHz/0dB is written is
prepared. With the test signal of 1kHz/0dB it repeats
between B from A and puts in playback state.
Are the audio signals outputted to 26pin(LINE Lch) and
24pin(HP Rch) of IC101, 16pin(LINE Lch) and 13pin(LINE
Rch) of IC103?
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Check the input signal from IC101, IC103, and
their periphery, and service it if detective.
When the input signal is correct, IC101 or IC103
is replaced.
Are the audio signals outputted to 7pin(HP Lch) and 1pin(HP
Rch) of IC102, 7pin(LINE Lch) and 1pin(LINE Rch) of
IC102?
Check periphery circuit IC102, IC104, and
service it if defective.
When the periphery circuit is correct, IC102 or
IC104 is replaced.
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Is MUTE released, and has been the Q002 base L(0V)?
Check Q002 and the periphery circuit, and
service it if defective.
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Check periphery circuit from 7pin and 1pin to JK104, JK102
of IC102, IC104 and replace it if defective.
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㪥㫆 Are the contact point and the installation state of the tact
switches normal?
Re-install the switches correctly or replace the
poor switch.
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Does LED light correctly ?
Check the IC201 and their periphery, and
service it if detective.
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㪥㫆
When pressing each switches, do the voltage of each pin
of IC201(shown below) increase?
Check the switches and their periphery, and
service it if detective.
Replace IC201.
㪥㫆
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