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B
Press Tone Key to change tone setting,measure preout response
Response change properly?
NO
Check U112,±17V at tone board Check TONE_STB,OPSEL_DATA OPSEL_CLK signal
YES
Press Z-2/record key to current input channel then measure output level and THD
Level=2V±0.1V THD<0.03%?
NO
Check U109 U209 U111 U211 Check OPSEL_STB signal
YES
THE END
3-5
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Parse Time: 0.226 - Number of Queries: 120 - Query Time: 0.042