Convergence Adjustment - Sharp CX51N3 Service Manual

CONVERGENCE ADJUSTMENT

NO. Adjustment part Adjusting procedure and conditions
1 CONVERGENCE 1. Receive the "Crosshatch Pattern" signal.
ADJ. 2. Using the remote controller, call NORMAL
(To be done mode.
after the purity
adjustment.) Static convergence
1. Turn the 4-pole magnet to a proper opening
angle in order to superpose the blue and red
colours.
2. Turn 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 : Drive the wedge at point "a" and
swing the deflection coil upward.
b) Fig. b : Drive the wedge at point "b" and "c"
and swing the deflection coil downward.
c) Fig. c : Drive the "c" wedge deeper and
swing the deflection coil rightward.
d) Fig. d : Drive the "b" wedge deeper and
swing the deflection coil leftward.
2. Fix all the wedges on the CRT and apply glass
tape over them.
3. Apply lacquer to the deflection yoke lock screw,
magnet unit (purity, 4-pole, 6-pole magnets)
and magnet unit lock screw.
Finally received the Red-only and Blue-only
signals to make sure there is no other colours
on the screen.
4-pole magnet
6-pole magnet
Lacquer
Purity magnet
Waveform and others
BGR
Fig. a
RGB
Fig. b
RGB
B
G
R
Fig. c
BGR
R
G
B
Fig. d
Wedge "a"
About
100°
Lacquer
CRT neck
Wedge
"b"
20mm
8-1
CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
NO. Adjustment part
1 CRT CUTOFF Remark
1. Before CRT cutoff adjustment, SUB-BRIGHT, DRI-
ADJUSTMENT
RS/RW/RC, DRI-GS/GW/GC, DRI-BS/BW/BC,
B (I 2 C BUS
CUT-R and CUT-G must be INITIAL DATA.
G
CONTROL)
R 2. CRT Cutoff adjustment must be done inside a dark
room.
1. Switch TV to VIDEO mode,BLUE BACK OFF, with
NO VIDEO signal.
2. Press R/C to set Picture Normal condition.
3. First, off the screen by adjust screen variable resistor.
R
*4. Next, checking AKB circuit function by slowly increase
G
screen variable resistor until colour raster suddenly
B
on and off (AKB start function).
5. Then continue adjust until retrace line appear.
6. Finally, slowly decrease the screen variable resistor
until screen retrace line cut off (Not Raster)
Note :
Must confirm the AKB function in set before continue
the next adjustment.
2 SUB-
1. Call " SUB-BRI" in service mode. (Receive Cross-
BRIGHTNESS hatch pattern with 5 black level windows)
2. Adjust the " SUB BRIGHT " bus data in order that
ADJUSTMENT
the line 1and 2 have the same darkness wherelse
(I 2 C BUS
line 3 is one step (data) brighter than line 2. Finally
CONTROL)
data minus 1 to make line 1, 2, and 3 are in same
level (darkness).
1. Receive the "WHITE" pattern with BURST signal.
3 WHITE
2. Press R/C to set Picture NORMAL condition.
BALANCE
3. Connect the DC miliammeter between TP602 (-)
SERVICE
TP603 (+).
MODE ADJ.
4. Check Beam current should be around 1100 µA.
2
(I C BUS
5. Set it to service mode and adjust the DRI-GS, & DRI-
CONTROL)
BS data to have a colour temperature of 12300°K (
white ). * Note .
About
6. Receive "WHITE" pattern, WITH BURST signal, and
100°
set BRIGHTNESS Y by generator, to **10 cd/m2
(MINOLTA CA-100) by reducing LUMINATE Y sig-
nal.
7. Adjust "CUT-R" & "CUT-G" to get desired colour tem-
perature #. Then go back NORMAL mode (HIGH
Wedge
BRIGHT**) to check colour temperature.
"c"
If out of range, back to 1.
Note:This adjustment must be done after warm-
* Adjust DRI-GC/GW, DRI-BC/BW as following DATA,
after finishing DRI-BS and DRI-GS DATA ADJUST-
MENT.
4 Max. 1. Receive the "Monoscope Pattern" signal.
2. Press R/C to set Picture NORMAL condition.
beam check
3. Connect the DC miliammeter between TP603 (+) &
TP602 (–).
(Full Scale: 3 mA Range)
4. Beam current must be within 1100 ± 100 µA.
Adjusting procedure and conditions
*Alternative Procedure
(1) Step (1), (2), (3) and (4) are same
(2) Then continue adjust until retrace
(3) Connect the oscilloscope to related
(4) Then adjust Screen VR until the tip
1
Line 3 is one step (data) brighter than line 2
2
# 12300°K
(MINOLTA COLOUR ANALYZER CA-
100)
*Note: Above Data can be UP/DOWN
ing up the unit for 30 minutes or longer with * 12300°K DRI-GW="DRI-GS"-7
µ
a beam current over 700 A.
DRI-RW = 32 (FIXED), DRI-RS = 32 (FIXED)
DRI-BC = "DRI-BS"
(For 12300° K Condition)
8-2
Waveform and others
as beside procedure.
line appear and make sure the col-
our appear whether red, green or
biue.
test points as below which is based
on colour appear at (2) RED = TP47R,
GREEN =TP47G, BLUE = TP47B
of signal reach (3.2Vdc)
3.2Vdc
t
0
1 2 3 4 5
1 2 3 4 5
X : 0.272
Y : 0.275
by Volume key.
LOW HIGH
10cd/m2 120cd/m2
DRI-BW="DRI-BS"-7
DRI-GC="DRI-GS"-7
DRI-RC=25