Huvitz HDR-9000, Service Manual

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On the contrary, “ON+28” means that the origin of target motor is detected and it is close to the
maximum value of sensor as much as 28. The maximum value of sensor differs depending on the
type of sensor. Normally the value of sensors for disk position do not exceed 30 and that of sensors
for axis, pd, tilting do not exceed 1000.
In the above screen shots, one in the left-hand shows that the origin of axis motor is detected by
auto detection function. And the other shows the sensor value is increased as much as 774 after
driving axis motor 15 pulses. The sign of reference value indicates the direction of driving motor.