Sharp 21ES253E Panduan Servis - Halaman 10
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H-VCO, VIF-VCO & S-TRAP fo ADJUSTMENT
NO
ADJUSTMENT POINT
1 H-VCO ADJ
(Manual Adj)
(I2C BUS CONTROL)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data V03.
(AUTO & MANUAL ADJ)
(3) Connect oscilloscope to IC801 pin13 (H-OUT), adj V03 until freq
become 15.625 ± 0.15 KHz.
(Auto Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode.
(3) Choose service data V03, by pressing R/C Auto (Hex C1) key, OSD will appear "OK"
at screen.
(4) If appear "NG" pls repeat step 3.
(Manual Adj)
2 VIF-VCO ADJ
(I2C BUS CONTROL)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data V02.
(AUTO & MANUAL ADJ)
(3) Connect oscilloscope to IC801 pin7 (AFT), adj V02 until voltage become 2.5 ± 1 V.
(Auto Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data V02.
(3) Press the R/C Auto (Hex C1) key, OSD will appear "OK" at screen.
(4) If appear "NG" pls repeat step 3.
3 S-TRAP fo ADJ
(Manual ADJ)
(I2C BUS CONTROL)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data V20.
(AUTO & MANUAL ADJ)
(3) Connect oscilloscope to TP 801, adj V20 until voltage become Min (below 5 V).
(4) After that pls adj service data V19& V23 same as "V20", V21 to "V20+ 1", V22 to "V20-2".
(Auto Adj)
(1) In No signal (RASTER) condition.
(2) Go to service mode, choose service data V20 (S-TRAP I).
(3) Press the R/C Auto (Hex C1) key, OSD will appear "OK" at screen.
(4) If appear "NG" pls repeat step 3.
HORIZONTAL ,VERTICAL,DEFLECTION LOOP ADJUSTMENT (1)
NO
ADJUSTMENT POINT
1
V-SHIFT
(1) Receive Monoscope Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V12.
(3) Adjust V12 to align the center of the screen to the geometric center of CRT.
Note: B line (Monoscope middle line) must same or nearest higher position
to the A mark (Tube middle mark),refer to the attach drawing.
2
V-SIZE
(1) Receive Monoscope Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V11.
(3) Adjust V11 bus data until the overscan become 10 ± 1.5 %.
(to be done after V-shift adj)
3
V-LINEARITY
(1) Receive Monoscope Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V29.
(3 )Already preset. (Adjust this unless the linearity is not achieved.)
4
VS CORRECTION
(1) Receive Monoscope Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V27.
(3 )Already preset. (Adjust this unless the linearity is not achieved.)
5
H-SHIFT
(1) Receive Monoscope Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V13.
(3) Adjust the V13 bus data to have a balance position to spec of A=B (as attach drawing).
(4) If cannot make it to A=B, adjust from the best point so that A slightly smaller than B.
6
H-SIZE
(1) Receive Monoscope Pattern Signal (PAL 50 Hz).
(I2C BUS CONTROL) (2) Choose the service data V36
(3) Adjust V36 bus data until the overscan becomes 10 ± 1.5 %.
7
PARABOLA
(1) Receive CrossHatch Pattern Signal (PAL 50Hz).
(I2C BUS CONTROL) (2) Choose the service data V32
Adjust the 2nd vertical line from the right end of the crosshatch pattern
so that the middle 4 blocks are straight.
(3) Make sure both left / right of 2nd vertical line at optimum point
ADJUSTMENT CONDITION / PROCEDURE
ADJUSTMENT CONDITION / PROCEDURE
Caution 1: Pls aging TV more than 10 minutes before adjustment
*NOTE:
This adjustment must be done after aging
at least 3 minutes.
Figure
A
10
WAVEFORM OR OTHERS
WAVEFORM OR OTHERS
A
B
OK
OK
NG
B