Sharp 14GT15, Service Manual

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15
14GT15
14GT20
HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
V-SLOPE (I 2 C
BUS CON-
TROL)
V-SHIFT 50
(I
2 C BUS
CONTROL)
V - AMP 50 (I 2 C
BUS CON-
TROL)
S-CORREC-
TION (I
2 C BUS
CONTROL)
H - SHIFT (50)
(H-CENTER)
(I
2 C BUS
CONTROL)
SUB-SHARP-
NESS
1. Receive 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.
1. Call the "V-CENT" mode.
2. Increase or decrease "V-CENT" by Volume key
till the picture is centered.
1. Call the "V-AMP" mode.
2. Increase or decrease "V - AMP" by Volume key
to set overscan of 9.5% typical.
Adjustment Spec 9.5% range +1% -0%.
FIXED DATA, NO NEED TO ADJUST.
1. Call the "H-CENT" mode.
2. Increase or decrease "H-CENT" by Volume key
to center the picture horizontal.
1. Call the "SUB-SHP" mode.
2. Set "SUB-SHP" to 20 by pressing volume down
button.
1
2
3
4
5
PAL CHROMA ADJUSTMENT
No. Adjusting point Adjusting procedure/conditions Waveform and others
SUB COLOUR
(I
2
C 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 Colour Bar be at the
same level shown as Fig. 8.
5. Clear the SERVICE mode.
1
Cy G B
W Y 100%W
75%
Mg R
Fig. 8
6
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. 7