4
D-NE500/NE506CK
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 TP624 (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 S803. (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 S803 with a screwdriver having a
thin tip.
Note: Do not push the detection lever strongly, or it may be bent
or damaged.
3. Press the
N
X
button.
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.
TP644
RP642
TP640
TP639
TP636
TP635
TP633
TP632
TP631
TP610
TP701
R641
C608
C603
R608
R611
C616
C604
R620
R610
C615
R606
R618
C614
R605
R616
C613
R631
TP648 TP646
FB603
FB602
FB301
C610
C623
FB606
C609
VDR603
C625
R613
R103
TP627
TP623
TP621
TP622
TP626
TP630
R203
R315
R630
R314
C311
R625
R614
R603
R602
R609
C611
R615
R612
C605
R604
R624
R623
C621
R628
61
90
91
30
120
IC601
1
60
31
TP301
TP629
TP625
TP302
TP102
IC601 65 pin
– MAIN BOARD (SIDE B) –
C617
FB101
TP628
TP624
FB303
FB201
VDR602 VDR609
X601
C612
D306
D101
D305
J301
J301
i
TP624
– MAIN BOARD (SIDE A) –
S803
TP823
TP822
TP833
TP842
TP835
TP846
TP806
TP829
TP825
TP831
TP827
TP824
R834 R832
25
24
26
R827
R828
R829
R303
TP834
TP832
TP830
TP828
TP826
R842
R847
VDR802
VDR804
SL806
CN802
R840
C812
S803
(OPEN/CLOSE)
S803
– MAIN BOARD (SIDE B) –
Summary of Contents for CD Walkman D-NE500
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