Yamaha MDX-596 Service Manual page 25

Checking by using the test mode
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?
YES
Is a waveform provided at No.9 and 10 pins of IC1601 as
well as at No.5 and 6 pins of CN1402?
YES
Replace the spindle motor as a complete unit.
Sled motor does not run.
Does a change occur at No.22 and 23 pins of IC1201 when
R and E buttons are pressed?
YES
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?
YES
Does a voltage change occur at the + and - terminals of the
sled motor when the R and E buttons are pressed?
YES
Replace the sled motor.
NO
Check No.24 and 25 pins of IC1201 as well as solder
connections and parts of the peripheral circuit.
NO
Check IC1601, CN1402 and the mechanism switch circuit
board solder connections.
NO
Check the waveform at No.22 and 23 pins of IC1201,
peripheral parts and solder connections.
NO
Check IC1601 and CN1402 solder connections.
NO
Check the connection section to the sled motor for any
poor solder connections or broken wires.
MDX-596
24