Technics RS-B555

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Mi TROUBLESHOOTING OF DIRECT DRIVE MO
1. The motor does not 1. No power supply (+12V)
rotate. 2. The Hall element has failed (Current does
not flow).
3. The ceramic (or crystal) does not oscillate.
The motor does not rotate
properly. (When pressed,
it stops at certain
angles. Sometimes it
does not rotate even if
power is ON.)
1. The coil is broken or not properly soldered.
2. Output of the Hall element is not proper.
The motor is out of
control.
4. Abnormal wow 1. Same as those described for problem 2. Ez
Note: Check the points marked with an asterisk (%) by removing the DD motor con
pin @ to GND with a lead wire. (After the DD motor control P.C.B. is removed
the coil, heating the IC.)
1. The FG coil is broken.