Sharp 21BM2GMK2, Руководство по обслуживанию

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8
8-1
8-2
21BM2GMK2
CONVERGENCE
ADJUSTMENT
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
CONVERGENC ADJ. ( T
o
be done
after the purity adjustment.
1.
Receive the "Crosshatch Pattern" signal.
2
.
Using the remote controller
, call NORMAL
mode.
ST
A
T
IC CONVERGENCE
1.
T
u
rn the 4-pole magnet to a proper opening an-
gle in order to superpose the blue and red col- ours.
2.
T
u
rn the 6-pole magnet to a proper opening an-
gle 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. 5-1: Drive the wedge at point "a" and swing the deflection coil upward.
b)
Fig. 5-2: Drive the wedge at points "b" and "c" and swing the deflection coil downward.
c
)
Fig. 5-3: Drive the "c" wedge deeper and swing the deflection coil rightward.
d
)
Fig. 5-4: Drive the "b" wedge deeper and swing the deflection coil leftward.
2
.
Fix all the wedges on the CR
T
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 sig- nals to make sure there is no other colours on the screen.
1
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
°
4-pole magnet
6-pole magnet
CRT neck
20mm
21''
Lacquer
Purity magnet
Fig. 5-1
Fig. 5-2 Fig. 5-3 Fig. 5-4
CRT CUT
-OFF
, BACKGROUND
AND SUB-CONTRAST
ADJUSTMENT
No.
Adjusting point
Adjusting procedure/conditions
W
aveform and others
CRT CUT
OFF
ADJUSTMENT (I
2
C BUS
CONTROL)
Remark 1
.
Before CR
T
cutof
f adjustment, SUB-BRIGHT
,
DRI-RS/R
W/RC, DRI-GS/GW/GC, DRI-BS/BW/
BC, CUT
-R and CUT
-G must be INITIAL
DA
T
A
.
2. CR
T
Cutof
f 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, of
f the screen by adjust screen variable re-
sistor
.
*4. Next, checking
AKB circuit function by slowly in-
crease screen variable resistor until colour raster suddenly on and of
f (AKB start function).
5.
Then continue adjust until retrace line appear
.
6. Finally
, slowly decrease the screen variable re-
sistor until screen retrace line cut of
f. (Not Raster)
Note :
Must confirm the
AKB function in set before con-
tinue the next adjustment.
1
SUB-BRIGHT
-
NESS ADJUSMENT (I
2
C BUS
CONTROL)
1
.
Call " SUB-BRI" in service mode. (Receive Cross- hatch pattern with 5 black level windows)
2
.
Adjust the " SUB BRIGHT " bus data in order that the line 1and 2 have the same darkness wherelse line 3 is one step (data) brighter than line 2. Fi- nally data minus 1 to make line 1, 2, and 3 are in same level (darkness).
2
Line 3 is one step (data) brighter than line 2
t
3.2Vdc 0
WHITE BAL- ANCE SER
V
-
ICE MODE ADJ. (I
2
C BUS
CONTROL)
1
.
Receive the "WHITE" pattern with BURST signal.
2.
Press R/C to set Picture NORMAL condition.
3
.
Connect the DC miliammeter between
TP602
(-) TP603
(+).
4.
Check Beam current should be around 1
100
µ
A.
5.
Set it to service mode and adjust the DRI-GS, & DRI-BS data to have a colour temperature of 12300
°
K or 18000
°
K ( white ). * Note .
6.
Receive "WHITE" pattern, WITH BURST signal, and set BRIGHTNESS
Y
by generator
, to **10
cd/m2 (MINOL
T
A
CA-100) by reducing
LUMINA
TE Y
signal.
7.
Adjust "CUT
-R" & "CUT
-G" to get desired colour
temperature #.
Then go back NORMAL
mode
(HIGH BRIGHT**) to check colour temperature. If out of range, back to (1).
Note:
This adjustment must be done after warming up the unit for 30 minutes or longer with a beam current over 700
µ
A.
* Adjust
DRI-GC/GW
, DRI-BC/BW as following data,
after finishing DRI-BS and DRI-GS data adjust- ment.
DRI-R
W = 32 (FIXED), DRI-RS = 32 (FIXED)
DRI-BC = "DRI-BS" (For 12300
°
K and 18000
°
K Condition)
3
#
1
2300
°
K
X
: 0.272
Y
: 0.275
#
18000
°
K
X
: 0.255
Y
: 0.255
(MINOL
T
A
COLOUR
ANAL
YZER
CA-100) *Note:
Above Data can be UP/
DOWN by V
olume key
.
L
O
W
HIGH
10cd/m2
120cd/m2
*Alternative Procedure (1) Step (1), (2), (3) and (4) are
same as beside procedure.
(2)
Then continue adjust until re-
trace line appear and make sure the colour appear whether red, green or blue.
(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.
* 12300
°
K DRI-GW="DRI-GS"-7
DRI-BW="DRI-BS"-7 DRI-GC="DRI-GS"-5 DRI-RC=25
* 18000
°
K DRI-GW="DRI-GS"-7
DRI-BW="DRI-BS"-7 DRI-GC="DRI-GS"-5 DRI-RC=27
1 2
1 2 3 4 5 1 2 3 4 5