Check Laser Current a. Touch the IOP test land IOP on the MA-C30 Mounted Board. b. Measure the voltage generated by the laser current while the drive in process of focus search. c. It is supposed to be about 4.5V because the voltage of IOP will drop by IOP x10� from 5V-A. d. Otherwise replace the optical pick-up. Check G Sensor a. Pull the SE-C7 P. W. B. cable out from the connector. b. Measure the resistance between 3 terminals respectively. (VSG-GND, GND-5V) c. The resistance should be 3.7 ± 1M� between VSG and GND, and 94 ± 6k� between GND and 5V.
5-2-4-9. Chucking Mechanism a. Listen the sound from the drive while the drive is spinning up. b. Check if there is any slipping noise among the Turntable, the Chucking Pulley Ass'y and the Disc. c. If you hear any, check the mechanical adjustments (SECTION 4). d. Otherwise disassemble the drive and check if there is excessive dust or any contamination on the Turntable or the disc. Note: As the CD-56 adopts the VCAN (Vibration Cancel) motor for the spindle motor, clattering sounds of the ball bearings are produced during spinning up and spinning down. Differentiate these from slipping sounds. 5-2-4-10. Sled Motor a. Disconnect the SE-C7 P. W. B. cable from the SE-C7 board. b. Check the resistance between 2 terminals of sled motor. c. It should be 10.8� ± 10%.
VSG GND 5V
[MA-C30 BOARD] (SIDE B)
TP IOP Laser Current Check
