Sharp 20GT-15, Руководство по обслуживанию

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9
20GT-15
HORIZONTAL, VERTICAL, DEFLECTION LOOP and
FOCUS ADJUSTMENT
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR OTHERS
1
NO
V-SLOPE (I2C BUS CONTROL)
(1)
Receive PAL 50Hz Monoscope Pattern Signal
(2)
Call the "V-LIN" mode.
(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-SHIFT (I2C BUS CONTROL)
(1)
Call the "V-CENT" mode.
(2)
Increase or decrease "V-CENT" by Volume key till the picture is centered.
3
V
- AMP
(I2C BUS CONTROL)
(1)
Call the "V-AMP" mode.
(2)
Increase or decrease "V - AMP" by Volume key to set overscan of 8.5% typical. Adjustment Spec 8.5% range +1% -0%.
4
S-CORRECTION (I2C BUS CONTROL)
FIXED DATA, NO NEED TO ADJUST.
5
H- SHIFT (50) (H - CENTER) (I2C BUS CONTROL)
(1)
Call the "H-CENT" mode.
(2)
Increase or decrease "H-CENT" by Volume key to center the picture horizontal.
1
Focus
(1)
Receive the "Monoscope Pattern" signal.
(2)
Press R/C to set Picture NORMAL condition.
(3)
Adjust the focus control to get the best focusing.
CUT OFF, BKGD, SUB-CONT ADJUSTMENT.
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR OTHERS
1
NO
CRT CUTOFF ADJUSTMENT (I2C BUS CONTROL)
(1)
Switch TV to VIDEO mode, BLUE BACK OFF, with NO VIDEO signal.
(2)
Press R/C to set Picture Normal condition.
(3)
Connect the oscilloscope to Red OUT from IC801. (TP851) Range
: 1 V/Div (DC)
Sweep
: 5 msec/Div
(3) Adjust SCREEN VR, so that the tip of signal
reach 3.0 Vdc
±
0.1 Vdc.
2
SUB-BRIGHTNESS ADJUSMENT (I2C BUS CONTROL)
(1)
Call "SUB-BRI" in service mode. (Receive Crosshatch pattern with 5 black level windows)
(2)
Adjust the "SUB BRIGHT" bus data in order that the line 1, 2 and 3 have the same darkness wherelse line 4 is slightly brighter than line 1, 2 and 3 and finally line 5 will be the brighter than line 4.
3
WHITE BALANCE SERVICE MODE ADJ (I2C 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 the TP602 ( - ) TP 603 ( + ).
(4)
Check Beam current should be around 1100
µ
A. (20"/21") (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 12,300
°
K . * Note .
(6)
Receive "WHITE" pattern, WITH BURST signal, and set Brightness Y by generator, to ** 10 cd/m2 (Minolta CA-100) by reducing Luminate Y signal.
(7)
Adjust "CUT-R" & "CUT-G" to get 12,300
°
K.
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.
(For 14", the beam current should be over 500
µ
A).
*
ADJUST DRI-GC/GW, DRI-BC/BW AS FOLLOWING DATA AFTER FINISHING DRI-GS AND DRI-BS.
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
Max Beam Check
(1)
Receive the "Monoscope Pattern" signal.
(2)
Press R/C to set Picture NORMAL condition.
(3)
Connect the DC miliammeter between TP603 ( + ) & TP 602 ( - ) (Full Scale: 3mA Range)
(4)
Beam current must be within 1100
±
100
µ
A (21")
800
±
100
µ
A (14")
Refer to
SHIPPING SETTING &
CHECKING
.
# 12300
°
K
X
: 0.272
Y : 0.275
(MINOLTA COLOUR ANALYZER CA-100) *Note:
Above Data can be UP/DOWN by Volume key.
Low
High
14"
10cd/m2
200cd/m2
20"/21"
10cd/m2
120cd/m2
1 2 3 4 5
3.0Vdc
0
1V
1, 2, 3 are in same black level.
PAL CHROMA ADJUSTMENT
ADJUSTMENT POINT
ADJUSTMENT CONDITION / PROCEDURE
WAVEFORM OR OTHERS
1
NO
SUB COLOUR (I2C BUS CONTROL)
(1)
Receive the "PAL Colour Bar" signal.
(2)
Press R/C to set Picture Normal condition.
(3)
Connect the oscilloscope to Red cathode. (TP854) Range
: 20 V/Div (AC)
(Using 10:1 Probe)
Sweep Time
: 10
µ
sec/Div
(4)
Using the R/C call "SUB COL" in SERVICE mode. Adjust SUB COLOUR bus data, so that the 75% White & Red portions of PAL Color Bar be at the same level shown as Fig. 1-1.
(5)
Clear the SERVICE mode.
Fig. 1-1
Cy G
B
W
Y 100%
W Mg R
75%