D-EJ985
SECTION 1
SERVICING NOTES
About CD-Rs/CD-RWsBEFORE REPLACING THE OPTICAL PICK-UP BLOCK
This CD player can play CD-Rs/CD-RWs recorded in the CD-DPlease be sure to check thoroughly the parameters as par the OOp-A
format*, but playback capability may vary depending on the qual-tical Pick-Up Block Checking Procedures� (Part No.: 9-960-027-
ity of the disc and the condition of the recording de11) issued separately before replacing the optical pick-up block.vice.
* CD-DA is the abbreviation for Compact Disc Digital Note and specifAudio. It isications required to check are given below.
a recording standard used for the Audio CDs.
Y FOK output: IC601 yg pin
W hen checking FOK, remove the lead wire to disc motor.
Y RF signal P-to-P value: 0.45 to 0.65 Vp-pNOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
LASER DIODE AND FOCUS SEARCH OPERATION
The laser diode in the optical pick-up block may suffer electro-CHECK
static breakdown because of the potential difference generated byDuring normal operation of the equipment, emission of the laser
the charged electrostatic load, etc. on clothing and the human body.diode is prohibited unless the upper lid is closed while turning ON
During repair, pay attention to electrostatic breakdown and alsothe S804. (push switch type)
use the procedure in the printed matter which is included in theThe following checking method for the laser diode is operable.
repair parts.
The flexible board is easily damaged and should be handled with
care.Y Method:
Emission of the laser diode is visually checked.
NOTES ON LASER DIODE EMISSION CHECK1. Open the upper lid.
The laser beam on this model is concentrated so as to be focused2. With a disc not set, turn on the S804 with a screwdriver having
on the disc reflective surface by the objective lens in the opticala thin tip as shown in Fig.1.
3. Push theN X button.
pick-up block. Therefore, when checking the laser diode emis-4. Observing the objective lens, check that the laser diode emits
sion, observe from more than 30 cm away from the objective lens.light.
W hen the laser diode does not emit light, automatic power
control circuit or optical pickup is faulty.
In this operation, the objective lens will move up and down 4
times along with inward motion for the focus search.
detection lever
detection lever
S804
MAIN board
Fig. 1 Method to push the S804
3 |
ACEC
