D-NE510/NE511/NE518CK
SECTION 1
SERVICE NOTE
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCKdetection lever
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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 in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
Precautions for Checking Emission of Laser Diode
Laser light of the equipment is focused by the object lens in the
optical pick-up so that the light focuses on the reflection surface
detection lever
of the disc. Therefore, be sure to keep your eyes more then 30 cm
apart from the object lens when you check the emission of laser
diode.
Before Replacing the Optical Pick-Up Block
Please be sure to check throughly the parameters as par the OOpti-
cal Pick-Up Block Checking Procedures� (Part No.: 9-960-027-
11) issued separately before replacing the optical pick-up block.main board
S820
Note and specifications required to check are given below.
YFOK output : IC601 yg pin (or TP618 (FOK))
W hen checking FOK, remove the lead wire to disc motor� MAIN BOARD � (SIDE B).
YRF signal P-to-P value : 0.45 ? 0.1 Vp-pR612
C8531312TP934
YThe repairing grating holder is impossible.C107R111R303TP933
TP422R101R102 C103IC301
TP932
TJ402R201R202C203R211C207
Laser Diode Checking MethodsTP939
C447C434TP942 TP940241
During normal operation of the equipment, emission of the laser
TP941
C305
diode is prohibited unless the upper lid is closed while turning ONS820R947
R438TJ503
C436R495(OPEN/CLOSE)C306
the S820. (push switch type)TP826
TJ501R948 R945
R467R484TP930
The following two checking methods for the laser diode areR498TJ502R946 R867
C808R943
operable.
R806 TP929
R871L301
FB403TJ406(VCPU)
YMethod:TP820S804
R487
Emission of the laser diode is visually checked.
S820
1. Open the upper lid.
2. With a disc not set, turn on the S820 with a screwdriver having a
Fig. 1
thin tip as shown in Fig.1.
or TAP805 is shorted as shown in Fig.2.
Note:Do not push the detection lever strongly, or it may be bent
or damaged.
� MAIN BOARD � (SIDE A)
3. Press the N X button.FB402
4. Observing the objective lens, check that the laser diode emits
light.FN406CN601
15
When the laser diode does not emit light, automatic power
control circuit or optical pick-up is faulty.
1SL806
In this operation, the objective lens will movR301e up and doR302wn 5
R606
times along with inward motion for the focus searcC309h.
C307
FB405R650
C308
FB404FB410
FB409R427
C424
C302C303R436
TP910
TP911
C427R477
C442
TAP805
TAP805
Fig. 2
3 |
ACEC
