Sharp CX34L3, Service Manual

Page: 8 / 50

8-1
8-2
CX34L3/51L3/51L4
8
CONVERGENCE ADJUSTMENT
NO
.
Adjustment par
t
Adjusting pr
ocedure and conditions
W
a
vef
orm and other
s
1
CONVERGENCE ADJ
.
(T
o be done
after the purity adjustment.)
1.
Receive the "Crosshatch Pattern" signal.
2
.
Using the remote controller
, call NORMAL
mode.
Static convergence 1
.
T
u
rn
the 4-pole magnet to a proper opening
angle in order to superpose the blue and red colours.
2
.
T
u
rn
the 6-pole magnet to a proper opening
angle in order to superpose the green colour over the blue and red colours.
Dynamic convergence 1.
Adjust the convergence on the fringes of the
screen in the following steps. a
)
Fig.
a :
Dr
iv
e the wedge at point "a" and
s
wing the deflection coil upw
ard.
b)
Fig.
b :
Dr
iv
e the w
edge at point "b" and "c"
and s
wing the deflection coil do
wnward.
c
)
Fig.
c :
Dr
iv
e the "c" w
edge deeper and
s
wing the deflection coil r
ightw
ard.
d
)
Fig.
d :
Dr
iv
e the "b" w
edge deeper and
s
wing the deflection coil leftw
ard.
2
.
Fix all the w
edges on the CR
T and apply glass
tape over them.
3
.
Apply lacquer to the deflection y
o
ke
loc
k scre
w
,
magnet unit (pur
ity
, 4-pole
, 6-pole magnets)
and magnet unit loc
k scre
w
.
Finally received the Red-only and Blue-only signals to make sure there is no other colours on the screen.
Fig. b Fig. a Fig. c Fig. d
1
.
Call " SUB-BRI" in service mode. (Receive Cross- hatch pattern with 5 black level windows)
*(2) Adjust the " SUB BRIGHT " b
us data in order that
the line 1and 2 have the same darkness wherelse line 3 is one step (data) brighter than line 2. Finally data minus 1 to make line 1, 2, and 3 are in same level (darkness).
Remark 1
.
Bef
ore CR
T cutoff adjustment,
SUB-BRIGHT
, DRI-
RS/R
W/RC,
DRI-GS/GW/GC,
DRI-BS/BW/BC,
CUT
-R and CUT
-G m
ust be INITIAL D
A
T
A
.
2. CRT Cutoff adjustment must be done inside a dark
room.
1
.
Switch
TV to
VIDEO mode
,BLUE BA
CK OFF
, with
NO VIDEO signal.
2.
Press R/C to set Picture Normal condition.
3
.
First, off the screen b
y
adjust screen v
a
riab
le resistor
.
*4.
Ne
xt, chec
king AKB circuit function b
y
slo
w
ly increase
screen variable resistor until colour raster suddenly on and off (AKB star
t function).
5.
Then continue adjust until retr
ace line appear
.
6.
Finally
, slo
wly decrease the screen v
a
riab
le resistor
until screen retr
ace line cut off (Not Raster)
Note :
Must confir
m the AKB function in set bef
ore continue
the next adjustment.
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
NO
.
Adjustment par
t
Adjusting pr
ocedure and conditions
W
a
vef
orm and other
s
1 2
SUB- BRIGHTNESS ADJUSTMENT (I
2
C B
U
S
CONTR
OL)
Line 3 is one step (data) brighter than line 2
CR
T CUT
OFF
ADJUSTMENT (I
2
C B
U
S
CONTR
OL)
3
WHITE B
ALANCE
SER
VICE
MODE ADJ
.
(I
2
C B
U
S
CONTR
OL)
1.
Receive the "WHITE" pattern with BURST signal.
2.
Press R/C to set Picture NORMAL condition.
3
.
Connect the DC miliammeter betw
een
TP602 (-)
TP603 (+).
4.
Chec
k Beam current should be around 1100
µ
A.
(14" around 800
µ
A).
5
.
Set it to service mode and adjust the DRI-GS, & DRI- BS data to have a colour temperature of 12300
°
K (
white ). * Note .
6.
Receive "WHITE" pattern, WITH BURST signal, and set BRIGHTNESS
Y b
y
gener
ator
, to **10 cd/m2
(MINOL
T
A
CA-100) b
y
reducing LUMINA
TE
Y sig-
nal.
7
.
Adjust "CUT
-R" & "CUT
-G" to get desired colour tem-
per
ature #.
Then go bac
k NORMAL mode (HIGH
BRIGHT**) to check colour temperature. If out of r
ange
, bac
k to 1.
Note:This adjustment m
ust be done after warm-
ing up the unit f
or 30 min
utes or longer with
a beam current o
ver 700
µ
A.
(For 14" the
beam current should be o
ver 500
µ
A).
* Adjust DRI-GC/GW
, DRI-BC/BW as f
ollo
wing D
A
T
A
,
after finishing DRI-BS and DRI-GS D
A
T
A
ADJUST
-
MENT
.
DRI-R
W = 32 (FIXED), DRI-RS = 32 (FIXED)
DRI-BC = "DRI-BS" (For 12300
°
K Condition)
# 12300
°
K
X
: 0.272
Y : 0.275
(MINOL
T
A
COLOUR ANAL
YZER CA-
100) *Note:
Abo
ve Data can be UP/DO
WN
b
y
V
olume
ke
y
.
LOW
HIGH
14"
10cd/m2
200cd/m2
20"/21"
10cd/m2
120cd/m2
4
Max. beam chec
k
1.
Receive the "Monoscope Pattern" signal.
2.
Press R/C to set Picture NORMAL condition.
3
.
Connect the DC miliammeter betw
een
TP603 (+) &
TP602 (–). (Full Scale: 3 mA Range)
4.
Beam current m
ust be within
1100
±
100
µ
A.(20"/21")
800
±
100
µ
A.(14")
1 2 3 4 5
RGB BGR
R G B
R G B
B G R
B G R
RGB BGR
Lacquer
Wedge "a"
Wedge "b"
Wedge "c"
About 100
°
About 100
°
Note*** CR
T
CPT CR
T
35mm
T
O
SHIBA CR
T
35mm
SAMSUNG CR
T
32mm
4-pole magnet
6-pole magnet
CRT neck
(21") - 20mm 14" - note***
Lacquer
Purity magnet
t
3.2Vdc /3.3VDdc 0
*Alternative Procedure (1) Step (1), (2), (3) and (4) are same
as beside procedure.
(2)
Then continue adjust until retr
ace
line appear and make sure the col- our appear whether red, green or biue.
(3) Connect the oscilloscope to related
test points as below which is based on colour appear at (2)
RED =
TP47R,
GREEN =TP47G, BLUE =
TP47B
(4)
Then adjust Screen
VR until the tip
of signal reach (3.2Vdc for 21", 3.3Vdc for 14")
1 2 3 4 5
1
2
* 12300
°
K DRI-GW="DRI-GS"-7
DRI-BW="DRI-BS"-7 DRI-GC="DRI-GS"-7 DRI-RC=25