D-EJ750/EJ751/EJ753/EJ755/EJ756CK/EJ758CK
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 diodeBASE 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).
breakdown because of the potential difference generated by the charThe following two checking methods for the laser diode are operable.ged
electrostatic load, etc. on clothing and the human body. During repair,
pay attention to electrostatic breakdown and also use the procedure inMethod :
the printed matter which is included in the repair parts.Emission of the laser diode is visually checked.
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 .
NOTES ON LASER DIODE EMISSION CHECK3. Check the object lens for confirming normal emission of the laser
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
Therefore, when checking the laser diode emission, observe from morelaser diode is turned ON about 2.5 seconds for focus searching.
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.
S801
Y FOK output : IC601 yg pin
When checking FOK, remove the lead wire to disc motor.
Y RF signal P-to-P value : 0.45 to 0.65Vp-p
Fig.1 Method to push S801
SECTION 2
GENERALThis section is extracted from
LOCATING THE CONTROLSinstruction manual.
CD player (front)
1 PLAY MODE9 DC IN 4.5 V (external
buttonpower input) jack
2 SOUND button
0 Strap holes
3VOL (volume) +*
qa Display
4 'm (AMS/qs REPEAT/ENTER
search) buttonbutton
qd HOLD switch5 VOL (volume) �
button
6 X (pause) buttonqf OPEN switch
7 x (stop)/CHG (charge)qg LINE OUT
button
8 N* (play)/>
(AMS/search) button qh i (headphones)
CD player (inside)
qj G-PROTECTION
switch
qk Battery compartment
*The button has a tactile dot.
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ACEC
