3
D-NE510/NE511/NE518CK
C308
R301
C307
R302
FN406
C309
FB405
FB404
R650
FB409
R606
CN601
TAP805
TP910
TP911
FB402
FB410
R427
SL806
C424
R436
R477
C427
C303
C302
C442
15
1
TAP805
– MAIN BOARD – (SIDE A)
S820
– MAIN BOARD – (SIDE B)
L301
R467
R438
R484
R101
R201
R102
C103
R111
R303
R202
C203
R211
R871
R948
R945
R946
R867
TJ402
C853
R612
R947
C808
C306
C107
C207
TP941
TP942
TP940
TP939
TJ503
TP826
TP930
TP929
TJ406(VCPU)
TP820
TJ501
TJ502
TP934
TP933
TP932
13
24
12
1
IC301
R943
R806
R498
R495
FB403
R487
S804
S820
(OPEN/CLOSE)
C447
TP422
C436
C305
C434
SECTION 1
SERVICE NOTE
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
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
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 “Opti-
cal Pick-Up Block Checking Procedures” (Part No.: 9-960-027-
11) issued separately before replacing the optical pick-up block.
Note and specifications required to check are given below.
• FOK output : IC601
yg
pin (or TP618 (FOK))
When checking FOK, remove the lead wire to disc motor.
• RF signal P-to-P value : 0.45 ± 0.1 Vp-p
• The repairing grating holder is impossible.
Laser Diode Checking Methods
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S820. (push switch type)
The following two checking methods for the laser diode are
operable.
• Method:
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. With a disc not set, turn on the S820 with a screwdriver having a
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.
4. Observing the objective lens, check that the laser diode emits
light.
When the laser diode does not emit light, automatic power
control circuit or optical pick-up is faulty.
In this operation, the objective lens will move up and down 5
times along with inward motion for the focus search.
Fig. 2
Fig. 1
detection lever
detection lever
main board
S820
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
