SECTION 1
SERVICING NOTES
Laser Diode Checking Methods
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR
During normal operation of the equipment, emission of the laser diode
BASE UNIT
is prohibited unless the upper panel is closed while turning ON the S801
The laser diode in the optical pick-up block may suffer electrostatic(push switch type).
The following two checking methods for the laser diode are operable.
breakdown because of the potential difference generated by the charged
electrostatic load, etc. on clothing and the human body. During repair,
pay attention to electrostatic breakdown and also use the procedure inMethod :
Emission of the laser diode is visually checked.
the printed matter which is included in the repair parts.
The flexible board is easily damaged and should be handled with care.1. Open the upper lid.
2. Push the S801 as shown in Fig. 1 .
3. Check the object lens for confirming normal emission of the laser
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on thediode. If not emitting, there is a trouble in the automatic power
disc reflective surface by the objective lens in the optical pick-up block.control circuit or the optical pick-up. During normal operation, the
laser diode is turned ON about 2.5 seconds for focus searching.
Therefore, when checking the laser diode emission, observe from more
than 30cm away from the objective lens.
Before Replacing the Optical pick-up Block
Please be sure to check thoroughly the parameters as per the OOptical
pick-up Block Checking Procedure� (Part No. : 9-960-027-11) issued
separately before replacing the optical Pick-up block.
Note and specifications required to check are given below.
Y FOK output : IC601 eg pin
When checking FOK, remove the lead wire to disc motor.
Y RF signal P-to-P value : 0.4 to 0.5Vp-p
S801
Fig.1 Method to push S801
� 3 � |
ACEC
