14Gt15 - Sharp 14GT15 Service Manual

HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT
No. Adjusting point
1 V-SLOPE (I 2 C 1. Receive Monoscope Pattern Signal.
BUS CON- 2. Call the "V-LIN" mode.
TROL) 3. Increase or decrease "V-LIN" by Volume key till
2 V-SHIFT 50 1. Call the "V-CENT" mode.
(I 2 C BUS 2. Increase or decrease "V-CENT" by Volume key
CONTROL)
3 V - AMP 50 (I 2 C 1. Call the "V-AMP" mode.
BUS CON- 2. Increase or decrease "V - AMP" by Volume key
TROL)
4 S-CORREC- FIXED DATA, NO NEED TO ADJUST.
TION (I 2 C BUS
CONTROL)
H - SHIFT (50) 1. Call the "H-CENT" mode.
5
(H-CENTER) 2. Increase or decrease "H-CENT" by Volume key
(I 2 C BUS
CONTROL)
SUB-SHARP- 1. Call the "SUB-SHP" mode.
6
NESS 2. Set "SUB-SHP" to 20 by pressing volume down
7 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 focus.
No. Adjusting point
1 SUB COLOUR 1. Receive the "PAL Colour Bar" signal.
2
(I C BUS 2. Press R/C to set Picture Normal condition.
CONTROL) 3. Connect the oscilloscope to Red cathode(TP854).
4. Using the R/C call "SUB COL" in SERVICE mode.
5. Clear the SERVICE mode.
Adjusting procedure/conditions
the horizontal line in the center of monoscope is
just at the position where the blanking starts.
till the picture is centered.
to set overscan of 9.5% typical.
Adjustment Spec 9.5% range +1% -0%.
to center the picture horizontal.
button.
PAL CHROMA ADJUSTMENT
Adjusting procedure/conditions
» Range
: 20 V/div. (AC) (Using 10:1 probe)
» Sweep time : 10 sec/div.
Adjust SUB COLOUR bus data, so that the 75%
White & Red portions of PAL Colour Bar be at the
same level shown as Fig. 8.
15
Waveform and others
Waveform and others
B
Cy G
W Y 100%W Mg R
75%
Fig. 8

14GT15

14GT20