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CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
1
CRT CUTOFF
1. Switch TV to VIDEO mode,BLUE BACK OFF, with-
ADJUSTMENT
out VIDEO signal.
2. Press R/C to set Picture Normal condition.
3. First off the screen by adjust screen variable re-
sistor.
*4. Next, check AKB circuit function by slowly increase
screen variable resistor until colour raster suddenly
On and Off (AKB start function).
5. Then continue adjust unfil retrace line appear.
6. Finally, slowly decrease the screen variablu resis-
tor unfil screen retrace line (Not Raster) Cut Off.
*NOTE : Must comfirm the AKB function in set before
continue the next adjustment.
REMARK:
1. Before CRT Cutoff adjustment, SUB-BRIGHT, DRI-
RS/RC/RW, DRI-GS/GC/GW, DRI-BS/BC/BW,
CUT-R and CUT-G must be in initial data.
2. CRT Cutoff adjustment must be done inside a dark
room.
2
SUB-BRIGHT-
1. Call " SUB-BRI" in service mode. (Receive Cross-
NESS
hatch pattern with 5 black level windows)
ADJUSMENT
2. Adjust the " SUB BRIGHT " bus data in order that
(I2C BUS
the line 1 and 2 have the same darkness whereas
CONTROL)
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.
3
WHITE BAL-
1. Receive the "WHITE" pattern with BURST SIGNAL.
ANCE SERV-
2. Press R/C to set Picture NORMAL condition.
ICE MODE
3. Connect the DC miliammeter between the TP602
ADJ. (I2C BUS
(-) TP603 (+).
4. Check Beam current should be around 1,350 µA.
CONTROL)
5. Set it to service mode and adjust the " DRI-GS"
(White Point-G), "DRI-BS" (White Point-B) data
to have a colour temperature of 12,300°K or
18000ºK (white).
* Note .
6. Receive "White" pattern, with BURST signal, and
set Brightness Y by generator, to **10cd/m
(Minolta CA-100) by reducing Luminate Y signal.
7. Adjust "CUT-R" & "CUT-G" to get 12,300°K or
18000ºK . Then go back normal mode (High
Bright**) to check colour temperature. If out of
range, back to 5.
Waveform and others
*Alternative Procedure:
(1). Step (1),(2),(3) and (4) are same
as beside procedure.
(2). Then continue adjust until re-
trace appear and make sure the
colour appear wheather red,
green or blue
(3). Connect the oscilloscope to re-
lated test points as below which
is based on colour appear at (2)
Colour Appear
Test Point
RED
TP 851
GREEN
TP 852
BLUE
TP 853
(4). Then adjust SCREEN VR until
the
tip
of
signal
3.2Vdc±0.1Vdc
3.2
0.1 Vdc
20mS
0
1
1 2 3 4 5
line 3 is one step (data) brighter
than line 2.
2
1 2 3 4 5
Refer to Page 7-2.
*18000°K
X: 0.255
Y: 0.255
*12300°K
X: 0.272
Y: 0.275
(MINOLTA COLOUR ANALYZER
CA-100)
*Note: Above Data can be UP/
DOWN by Volume key.
2
Low
High
2
**Note:
10cd/m
180cd/m
10-1
Note: This adjustment must be done after
warming up the unit for 30 minutes or
longer with a beam current over 700
* ADJUST DRI-GC/GW, DRI-BC/BW AS FOLLOW-
ING DATA, AFTER FINISHING DRI-GS AND DRI-
BS. *(12300ºK)
DRI-GC/GW DATA = "DRI-GS"-7 DATA
DRI-RC = 25; DRI-BC = DRI-BS; DRI-RW = 32
DRI-BW DATA = "DRI-BS"-7 DATA
4
Maximum
1. Receive the "Monoscope Pattern" signal.
beam check
2. Press R/C to set Picture NORMAL condition.
3. Connect the DC miliammeter between TP603 (+)
and TP602 (–).
(Full Scale: 3 mA Range)
4. Beam current must be within 1,350 ± 100 µA.
reach
HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
1
V-LINEARITY
1. Receive Monoscope Pattern Signal.
(I2C BUS
2. Call the "V-LIN" mode.
CONTROL)
3. Increase or decrease "V-LIN" by Volume key till
the horizontal line in the center of monoscope is
just at the position where the blanking starts.
2
V-CENTER
1. Call the "V-CENT" mode.
(I2C BUS
2. Increase or decrease "V-CENT" by Volume key
CONTROL)
till the picture is centered.
3
V - AMP (I2C
1. Call the "V-AMP" mode.
BUS CON-
2. Increase or decrease "V - AMP" by Volume key
TROL)
to set overscan of 8.5% typical.
Adjustment Spec 8.5% range +1% -1%.
4
H-CENTER
1. Call the "H-CENT" mode.
(I2C BUS
2. Increase or decrease "H-CENT" by Volume key
CONTROL)
to center the picture horizontal.
5
S-CORREC-
24(FIX DATA)
TION
2
*18000ºK
DRI-GW = "DRI-GS" DATA -7
µ
A).
DRI-BW = "DRI-BS" DATA -7
DRI-GC = "DRI-GS" DATA-5
DRI-RC = 27
Waveform and others
10-2
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