TABLE OF CONTENTS
SERVICE NOTESáááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá2
EXPLODED VIEWSáááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá3
DIAGRAMS
Printed Wiring Board � Tuner Section � ááááááááááááááááááááááááááááááááááá 6
Schematic Diagram � Tuner Section � ááááááááááááááááááááááááááááááááááááá 9
Schematic Diagram � CD Section � ááááááááááááááááááááááááááááááááááááááá 13
Printed Wiring Board � CD Section � áááááááááááááááááááááááááááááááááááá 17
ELECTRICAL PARTS LISTááááááááááááááááááááááááááááááááááááááááááááá20
SERVICE NOTE
NOTES ON HANDLING THE OPTICAL PICK-UPPrecautions for Checking Emission of Laser Diode
BLOCK OR BASE UNIT
Laser light of the equipment is focused by the object lens in the
The laser diode in the optical pick-up block may suffer electrostaticoptical pick-up so that the light focuses on the reflection surface of
breakdown because of the potential difference generated by thethe disc. Therefore, be sure to keep your eyes more then 30 cm
charged electrostatic load, etc. on clothing and the human body.apart from the object lens when you check the emission of laser
diode.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repairLaser Diode Checking Methods
parts.
The flexible board is easily damaged and should be handled withDuring normal operation of the equipment, emission of the laser
care.
diode is prohibited unless the upper panel is closed while turning
NOTES ON LASER DIODE EMISSION CHECKON the S801 (push switch type).
The following two checking methods for the laser diode are operable.
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-Y Method (In the service mode or normal operation):
up block. Therefore, when checking the laser diode emission,Emission of the laser diode is visually checked.
1. Open the upper lid.
observe from more than 30 cm away from the objective lens.2. Push the S801 as shown in Fig. 1.
3. Check the object lens for confirming normal emission of the
Before Replacing the Optical Pick-Up Blocklaser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up.
Please be sure to check thoroughly the parameters as par the OOpticalDuring normal operation, the laser diode is turned ON about
Pick-Up Block Checking Procedures� (Part No.:9-960-027-11)2.5 seconds for focus searching.
issued separately before replacing the optical pick-up block.
Note and specifications required to check are given below.
Y FOK output: IC501!a pin
When checking FOK, remove the lead wire to disk motor.
Y S curve P-to-P value: 1.0-2.8Vp-p IC501#�pin
When checking S curve P-to-P value, remove the lead wire to
disc motor.
Y RF signal P-to-P value: 0.8-1.2Vp-p
Y Traverse signal P-to-P value: 1.2Vp-p
Y The repairing grating holder is impossible.
Fug. 1 Method to push the S801
N 2 N |
ACEC
