Read Sony DAV-S300 (serv.man2) Service Manual online
5
(e) Setting of tray position
Mechanical switch detects the tray position. If the tray is open, DVD circuit closes the tray,
letting loading motor rotate and then set to the status “loaded”.
In case that the tray doesn’t close within a certain period, open the tray by
counter-rotating the motor to set “Ejected” status.
If the tray operation doesn’t complete within a certain period, stop the tray control as it is.
In this case, the status (open/close) is displayed when the control is stopped.
(Repair Know-how) Tray doesn’t work.
Confirm by moving the tray manually whether mechanical operation isn’t getting heavy
due to catching foreign object. When you use a screwdriver for moving the tray, pay
attention to not damaging to screw hole. (Refer to page 4 on Service manual)
In case that loading motor driver (IC802) becomes extremely hot, confirm output of
loading motor. If no output found, change IC.
(Repair Know-how) After power is turned ON, power is turned OFF automatically.
Open the tray a little manually, confirm whether it is loaded normally. Also, touch loading
motor driver(IC802) for your confirmation whether it becomes extremely hot or not.
(Repair Know-how) Operation of detection switch
If the tray position is normal, the status becomes as follows:
Figure 1, Detection switch
Terminal Close/
Chucking
Full open/
Unchucking
IC601 64pin OCSW1
H
L
IC601 88pin CKSW1
L
H
(f) Setting of OP block position
By Servo SP(IC701) output, sled driver(IC802) lets sled motor rotate and move OP block
to the most inner radius. Servo DSP(IC701 23pin) with Limit-In switch input detects the
move of OP block to the most inner radius. Return to the outer radius a little when OP block
moves to the most inner radius.
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