Sharp SX76NF200, Service Manual

Page: 5 / 66

5
5-1 5-2
SX76NF200
CUT OFF, BKGD ADJUSTMENT CONTINUED
NO
3
ADJUSTMENT POINT
Max Beam Check
ADJUSTMENT CONDITION / PROCEDURE
(1) Receive 50Hz Monoscope Pattern Signal.
(2) Press R/C to set Picture NORMAL condition.
(3) Select full mode.
(4) Connect the DC miliammeter between TP601 and
TP602
(Full Scale: 3mA Range)
(5) Beam current must be within 1800
±
100
µ
A.
4 SUB-CONTRAST
(SUB-CONT)
I2C bus adjustment
(RF SIGNAL)
(1) Receive the window pattern with AV input.
(2) Make the picture normal with the remote controller.
(3) Select the SUB-CONTRAST adjustment mode with the
remote controller, and adjust 50% white to 140
±
10cd.
WAVEFORM OR OTHERS
5 SUB-BRIGHTNESS
(SUB BRI)
I2C bus adjustment
(RF signal)
(1) Receive the window pattern with AV input.
(2) Make the picture normal with the remote controller.
(3) Select the sub-bright adjustment mode with the remote
controller, and adjust the right dark white area of the
window pattern to 2.0cd
±
0.5cd.
Note 2: Use "Y" of Minolta colour analyzer
CA-100.
Note 3: Use the PAL window pattern of
the signal generator SX1006 for
adjustment.
* When E-2 CH (Crosshatch pattern )or
eqivalent signal is received.
1. Make the picture normal with the remote
controller.
2. Adjust the 3rd (1 thru 5 from the left) balck
of the window pattern to sink.
Note 4: window pattern
Dark white for SUB-BRIGHT
50% white for SUB-CONT
CUT OFF POINT
PAL CHROMA ADJUSTMENT
NO
1
ADJUSTMENT POINT
SUB COLOUR
I2C Bus adjustment
(RF signal)
ADJUSTMENT CONDITION / PROCEDURE
(1) Receive the "PAL Colour Bar" signal. (E-10CH)
(2) Make the picture normal with the remote controller.
(3) Connect the oscilloscope to TP1802 (Use 10:1 probe)
Range:2V/Div Sweep time:20
µ
sec/Div
(4) Set the sub colour adjustment mode with the remote
controller, and vary the sub colour data to make 75% W
of the PAL colour bar and RED at the same level for
adjustment shown in Fig. 1-1.
WAVEFORM OR OTHERS
NTSC CHROMA ADJUSTMENT
NO
1
ADJUSTMENT POINT
SUB-TINT
I2C bus adjutment
(RF signal)
ADJUSTMENT CONDITION / PROCEDURE
(1) Select the sub-tint adjustment mode to receive NTSC
colour bar.
(2) Connect the oscilloscope to TP1803
Range :20mV/Div(AC) (Use Probe 10:1)
Sweep time :10
µ
sec/Div
(3) Vary the sub tint data to adjust the waveform to be
gained as shown in Fig 1-1.
*Change NVM data
position 7F1
data
07=>00 07 is the offset value for factory.
WAVEFORM OR OTHERS
HORIZONTAL, VERTICAL, DEFLECTION LOOP ADJUSTMENT
NO
1
2
3
4
5
ADJUSTMENT POINT
1) 100Hz FULL
V. LINEARITY
(I2C BUS CONTROL)
VERTICAL POSITION
(I2C BUS CONTROL)
VERTICAL AMP.
(I2C BUS CONTROL)
HORIZONTAL
POSITION
(I2C BUS CONTROL)
PICTURE WIDTH
(I2C BUS CONTROL)
ADJUSTMENT CONDITION / PROCEDURE
(1) Press R/C to set Picture NORMAL condition.
(2) Select full mode.
*Receive 50Hz Monoscope Pattern Signal.
(1) Call the "VERTICAL LINEARITY" mode.
(2) Increase or decrease "VERTICAL LINEARITY" by
Volume key till the horizontal line in the center of
monoscope is just at the position where the blanking
starts.
(1) Call the "VERTICAL POSITION" mode.
(2) Increase or decrease "VERTICAL POSITION" by
Volume key till the picture is centered.
(1) Call the "VERTICAL AMPLITUDE" mode.
(2) Increase or decrease "VERTICAL AMPLITUDE" by
Volume key to set overscan of 8% typical.
Adjustment Spec 8% range +1% -1%
(1) Call the "Hor.RGB Pos POFS3" mode. (not NEWLIN
mode)
(2) Increase or decrease "Hor.RGB Pos POFS3" by Volume
key to center the picture horizontal.
(1) Call the "PICTURE WIDTH" mode.
(2) Increase or decrease "PICTURE WIDTH" by Volume
key to set overscan of 8% typical.
Adjustment Spec 8% range +1% -1%
*Receive 50Hz Cross-Hatch Pattern Signal.
WAVEFORM OR OTHERS
Note:
VERTICAL POSITION and VERTICAL AMP.
2mm > |A-B| E-5
2mm > |C-D| A face is for south
Adjustment Spec 8.0% range +1% -1%
at the upper side of the geometry center and
the lower side of the geometry center
A
B
C
D
Cy G B
W Y W Mg R
100%
75%
Fig.1-1
Fig.1-1
W Y Cy G Mg R Bl B
Adjust
Same Level
(B-Y)