Philips 202P70/00, Руководство по обслуживанию

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88
202P7 CRT
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Fig.1
V
Warnings
1
2
0 V
3 ESD
4
5
6
7
8
9
10.
11.
. S a f et y reg ul at i o ns re qui re t h at t h e uni t sh o uld b e ret u r n e d
in i
t
s
or
i
g
in
a
l
co
ndi
t
i
o
n
a
nd
t
h
at co
m
po
n
e
n
t
s id
e
n
t
i
ca
l
to
t
h
e or
i
g
in
a
l
co
m
po
n
e
n
t
s
are
us
e
d.
T
h
e
s
a
f
et
y
co
m
po
n
e
n
t
s
are indi cate d by t h e symb o l .
. In
or
d
er to preve
n
t
d
a
m
age to
I
C
s
a
nd
tra
nsis
tor
s,
a
ll
hi g h- vo l tage fl a sh- over s mus t b e avo id e d. In or d er to
preve
n
t
d
a
m
age to t
h
e p
i
ct
u
re t
ub
e
,
t
h
e
m
et
h
o
d sh
o
wn
in Fi
g
. 1 sh
o
uld b
e
us
e
d
to
dis
c
h
arge t
h
e p
i
ct
u
re t
ub
e
.
Us e a hi g h- vo l tage pro b e a nd a mul t im eter ( po si t i o n D C -V).
Dis
c
h
arge
un
t
il
t
h
e
m
eter rea
din
g
is (
a
f
ter appro
xim
ate
ly
3
0
s
eco
nds).
.
All I
C
s
a
nd m
a
ny
ot
h
er
s
e
mi
co
ndu
ctor
s
are
s
e
nsi
t
i
ve to
e l ectro s tat i c dis c h arge s (ESD). Care l e ss h a ndlin g du r in g
repa
i
r ca
n d
ra
s
t
i
ca
lly sh
orte
n
t
h
e
i
r
lif
e
. M
a
k
e
su
re t
h
at
du
r
in
g repa
i
r
y
o
u
are co
nn
ecte
d by
a p
uls
e
b
a
nd wi
t
h
re sis ta n ce to t h e s a m e pote n t i a l a s t h e gro und o f t h e uni t .
K
eep co
m
po
n
e
n
t
s
a
nd
too
ls
a
ls
o at t
his s
a
m
e pote
n
t
i
a
l.
. Wh e n repa i r in g a uni t , a lw a ys co nn ect i t to t h e A C Po w er
vo
l
tage v
i
a a
n is
o
l
at
in
g tra
nsf
or
m
er
.
. B e care ful wh e n ta kin g m ea su re m e n t s in t h e hi g h- vo l tage
s
ect
i
o
n
a
nd
o
n
t
h
e p
i
ct
u
re t
ub
e pa
n
e
l.
. I t is reco mm e nd e d t h at s a f ert y gogg l e s b e w or n wh e n
rep l ac in g t h e p i ct u re t ub e .
. Wh e n m a kin g a djus t m e n t s,us e p l a s t i c rat h er t h a n m eta l too ls.
T his will preve n t a ny sh ort - c i rc ui t or t h e d a n ger o f a
c
i
rc
ui
t
b
eco
min
g
uns
ta
bl
e
.
. N ever rep l ace m o dul e s or ot h er co m po n e n t s whil e t h e
uni
t
is swi
tc
h
e
d
o
n.
. Toget h er wi t h t h e d e fl ec i to n uni t , t h e p i ct u re t ub e is us e d
a
s
a
n in
tegrate
d uni
t
. Adjus
t
m
e
n
t o
f
t
his uni
t
du
r
in
g repa
i
r
is n ot reco mm e nd e d.
Af
ter repa
i
r
,
t
h
e
wi
r
in
g
sh
o
uld b
e
f
a
s
te
n
e
d in
p
l
ace
wi
t
h
t h e ca bl e c l a m p s.
All uni
t
s
t
h
at are ret
u
r
n
e
d f
or
s
erv
i
ce or repa
i
r
mus
t pa
ss
t h e or i g in a l m a nuf act u re s s a f et y te s t s.
N ote s
T
h
e
di
rect vo
l
tage
s
a
nd w
ave
f
or
ms
are average vo
l
tage
s.
T h e y h ave b ee n m ea su re d usin g t h e S erv i ce te s t s o f t w are
a nd und er t h e f o ll o win g co ndi t i o ns :
- M
o
d
e
: 1
02
4*
7
6
8
(6
0
kHz /
7
5Hz)
- Si g n a l patter n : Whi te patter n
- Adjus t b r i g h t n e ss a nd co n tra s t co n tro l f or t h e
m
ec
h
a
ni
ca
l mid-
po
si
t
i
o
n (
c
li
c
k
po
si
t
i
o
n)
T h e p i ct u re t ub e pa n e l h a s pr in te d s par k gap s.
E
ac
h s
par
k
gap
is
co
nn
ecte
d b
et
w
ee
n
a
n
e
l
ectro
d
e o
f
t
h
e
p i ct u re t ub e a nd t h e Aqu a d ag coat in g .
T
h
e
s
e
mi
co
ndu
ctor
s indi
cate
d in
t
h
e c
i
rc
ui
t
di
agra
m(s)
a
nd in
t
h
e part
s lis
t
s
are co
m
p
l
ete
ly in
terc
h
a
n
gea
bl
e per
po si t i o n wi t h t h e s e mi co ndu ctor s in t h e uni t , i rre s pect i ve
o
f
t
h
e t
y
pe
indi
cat
i
o
n
o
n
t
h
e
s
e
s
e
mi
co
ndu
ctor
s.
1.
2.
3.
W
ar
in
g a
nd N
ote
s