2
DV-420V-K
1
2
3
4
A
B
C
D
E
F
1
2
3
4
SAFETY INFORMATION
This service manual is intended for qualified service technicians ; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trainedto properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely,
you should not risk trying to do so and refer the repair to a qualified service technician.
WARNING !
THE AEL (ACCE
SS
IBLE EMI
SS
ION LEVEL) OF THE LA
S
ER POWER OUTPUT I
S
LE
SS
THAN CLA
SS
1
BUT THE LA
S
ER COMPONENT I
S
CAPABLE OF EMITTING RADIATION EXCEEDING THE LIMIT FOR
CLA
SS
1.
A
S
PECIALLY IN
S
TRUCTED PER
S
ON
S
HOULD DO
S
ERVICING OPERATION OF THE APPARATU
S
.
LA
S
ER DIODE CHARACTERI
S
TIC
S
FOR DVD : MAXIMUM OUTPUT POWER : 5 mW
WAVELENGTH : 650 nm
FOR CD :
MAXIMUM OUTPUT POWER : 5 mW
WAVELENGTH : 780 nm
Additional Laser Caution
∗
:
S
ee p
a
ge
3
5.
1.
•
L
as
er diode i
s
driving with Q2
3
0
3
,Q2
3
05(650nm LD)
a
nd Q2
3
02,
Q2
3
04(780nm LD)on the DVD MT PCB A
ss
y.
Therefore,
when
s
hort-circ
u
it
b
etween the emitter
a
nd collector of the
s
e
tr
a
n
s
i
s
tor
s
or the
bas
e volt
a
ge i
s
su
pplied for tr
a
n
s
i
s
tor
s
t
u
rn on, the
l
as
er o
s
cill
a
te
s
. (f
a
il
u
re mode)
• In the te
s
t mode
∗
, there i
s
the mode th
a
t the l
as
er o
s
cill
a
te
s
except
for the di
s
c j
u
dgment
a
nd pl
a
y
ba
ck. LD ON mode in the te
s
t mode
o
s
cill
a
te
s
with the l
as
er forci
b
ly.
Note) Q2
3
02/Q2
3
04 exi
s
t
s
on the
s
ide B of the
b
o
a
rd.
Refer to the circ
u
it di
a
gr
a
m on p
a
ge 57.
2. When the cover i
s
open, clo
s
e viewing thro
u
gh the o
b
jective len
s
with
the
n
a
ked eye will c
aus
e expo
su
re to the l
as
er
b
e
a
m.
LABEL CHECK
a
r P
a
nel)
Location: inside of the unit
www. xiaoyu163. com
QQ 376315150
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8
TEL 13942296513
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Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
