Sharp SX76NF8, Service Manual

Page: 5 / 48

5
5-1
5-2
SX76NF8
FOCUS ADJUSTMENT NO
1
ADJUSTMENT POINT
FOCUS
ADJUSTMENT CONDITION / PR
OCEDURE
(1) Receiv
e
the "Monoscope P
a
tter
n
" signal.
(2) Press R/C to set Picture NORMAL condition. (3) Select full mode
.
(4) Adjust the f
ocus control to get the best f
ocusing.
(Ref
er to Adjustment P
o
int as r
ight dr
a
w
ing, SX76NF8
and SX66NF8)
W
A
VEFORM OR O
THERS
(Adjusted point)
PR
O
TECT
OR OPERA
TION CHECKING
NO
1 2
ADJUSTMENT POINT
H•V PR
O
TECT
OR
O
THER
PR
O
TECT
OR
ADJUSTMENT CONDITION / PR
OCEDURE
(1) Receiv
e
"Monoscope P
a
tter
n
" signal.
(2) Connect output of Bias Bo
x to D607 cathode
(3) Set v
o
ltage of Bias Bo
x to 18V and mak
e sure the
protector is not w
o
rk
.
(4) Set v
o
ltage of Bias Bo
x to 27V
, and mak
e sure the
protector is w
o
rk
.
(1) Once finish rectified Electrolytic Capacitor shor
t testing
in + B line
, chec
k all possib
le damaged components on
+B line
.
(Use r
andom selected set f
o
r inspection)
W
A
VEFORM OR O
THERS
A/V INPUT AND OUTPUT CHECKING NO
1 2 3 4 5 6
ADJUSTMENT POINT
AV OUTPUT CHECK AV
-1
INPUT CHECK AV
-2
INPUT CHECK AV
-1
Component INPUT CHECK FR
ONT
INPUT CHECK FR
ONT S-T
e
rm
inal
INPUT CHECK
ADJUSTMENT CONDITION / PR
OCEDURE
(1) Receiv
e
the "P
AL Color Bar" signal (100%
White Color
Bar
, Sound 400Hz 100% Mod)
(2)
T
e
rm
inate the
Video output with a 75 ohm impedance
.
Mak
e sure the output is as specified (1.0
Vp-p
±
3dB)
(3)
T
e
rm
inate the A
udio output with a 10 K
ohm impedance
.
Mak
e sure the output is as specified (2.61
Vp-p
±
3dB)
Chec
k of A
V
Chec
k of A
V
Chec
k of A
V
Chec
k of A
V
Chec
k of A
V
W
A
VEFORM OR O
THERS
50
Adjust these Hor
iz
ontal
and V
e
rtical
lines
(SX76NF8) Adjust at "50" position (SX66NF8)
FUNCTION OPERA
TION CHECKING (1) (VIDEO & A
UDIO)
NO
1 2 3 4 5 6 7 8 9
ADJUSTMENT POINT
CONTRAST COLOUR BRIGHTNESS SHARPNESS TINT ECO MODE COMB FIL
TER
NTSC HUE NORMAL
ADJUSTMENT CONDITION / PR
OCEDURE
(1) Receiv
e
"Monoscope P
a
tter
n" signal.
(2) Set P-Mode to select CONTRAST
.
(3) Press
V
o
lume Up/Do
wn k
e
y
to chec
k whether the
CONTRAST eff
ect is OK or not.
(1) Receiv
e
"Color Bar" signal.
(2) Set P-Mode to select COLOUR. (3) Press
V
o
lume Up/Do
wn k
e
y
to chec
k whether the
COLOUR eff
ect is OK or not.
(1) Receiv
e
"Monospcope P
a
tter
n" signal.
(2) Set P-Mode to select BRIGHTNESS
.
(3) Press
V
o
lume Up/Do
wn k
e
y
to chec
k whether the
BRIGHTNESS eff
ect is OK or not.
(1) Receiv
e
"Monoscope P
a
tter
n" signal.
(2) Set P-Mode to select SHARPNESS
.
(3) Press
V
o
lume Up/ Do
wn k
e
y
to chec
k whether the
SHARPNESS eff
ect is OK or not.
(1) Receiv
e
"Monoscope P
a
tter
n" signal.
(2) Set PICTURE to
TINT select.
(3) Press
V
o
lume Up/Do
wn k
e
y
to chec
k
TINT Option,
ST
AND
ARD:
NORMAL SETTING,
W
ARM f
or more
REDDISH direction changing, COOL f
o
r more BLUISH
direction changing.
(1) Receiv
e
"Monoscope P
a
tter
n" signal.
(2) Set P-Mode to select ECO MODE. (3) Press
V
o
lume Up/Do
wn k
e
y
to chec
k whether the ECO
MODE eff
ect is OK or not.
(1) Receiv
e
"Color Bar" signal.
(2) Set P-Mode to select COMB FIL
TER.
(3) Press
V
o
lume Up/Do
wn k
e
y
to chec
k whether the COMB
FIL
TER eff
ect is OK or not.
(1) INPUT "NTSC Color Bar" signal from A
V
-input.
(2) Set P-Mode to select NTSC HUE.. (3) Press
V
o
lume Up/Do
wn k
e
y
to chec
k whether the NTSC
HUE eff
ect is OK or not.
(1) In PICTURE Mode
, select NORMAL and press men
u
b
u
tton all the settings will be present to nor
mal setting.
(Nor
mal setting v
a
lue f
o
r e
v
er
y mode).
CONTRAST
: 80%
COLOUR
: 50%
BRIGHTNESS
: 50%
SHARPNESS
: 50%
TINT
: 50%
W
A
VEFORM OR O
THERS
Notes: If nothing is displa
y
mean contr
ast, colour
,
br
ight, tint, shar
pness are all nor
mal setting.