Yamaha MDX-9 Service Manual download pdf (Page 25)

MDX-596

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YES

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YES

Spindle motor does not run.

Is a correct waveform provided at No.24 and 25 pins of IC1201

during the AUTO adjustment mode step 3 in the test mode?

Check No.24 and 25 pins of IC1201 as well as solder

connections and parts of the peripheral circuit.

Is a waveform provided at No.9 and 10 pins of IC1601 as

well as at No.5 and 6 pins of CN1402?

Check IC1601, CN1402 and the mechanism switch circuit

board solder connections.

Replace the spindle motor as a complete unit.

Sled motor does not run.

YES

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YES

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YES

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Does a change occur at No.22 and 23 pins of IC1201 when

R and E buttons are pressed?

Does a change occur at No.14 and 15 pins of IC1601 and No.3 and

4 pins of CN1402 when the R and E buttons are pressed?

Check IC1601 and CN1402 solder connections.

Does a voltage change occur at the + and - terminals of the

sled motor when the R and E buttons are pressed?

Check the connection section to the sled motor for any

poor solder connections or broken wires.

Replace the sled motor.

Check the waveform at No.22 and 23 pins of IC1201,

peripheral parts and solder connections.

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Checking by using the test mode

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Yamaha MDX-9 Service Manual Page 25