Ntsc Chroma Adjustment - Sharp 21G-FX10L Service Manual

21G-FX10L
SCREEN, WHITE BALANCE, SUB-BRIGHTNESS & SUB-CONTRAST ADJUSTMENT(2)
NO ADJUSTMENT POINT
3 SUB-BRIGHTNESS (1) In CH 23 50IRE window pattern signal condition.
(to be done after screen, (2) Using Minolta Color Analyzer CA-100, let the gun point atDark White position
white balance adj) (as attach drawing), adjust V04 Bus data until BRIGHTNESS Y = 1.5cd/m2
(I2C BUS CONTROL)
4 SUB-CONTRAST (1) In CH 23 50IRE window pattern signal condition.
(to be done after screen,
(2) Using Minolta Color Analyzer CA-100, let the gun point atWhite position
white balance adj, (as attach drawing), adjust V01 Bus data until BRIGHTNESS Y = 150cd/m2
sub-brightness adj)
** NOTE: Allowable Data for V01 >=90, even Y can't match the spec
(I2C BUS CONTROL)
5 BEAM CURRENT CHECK (1) Receive US 4 CH LION HEAD Signal (NTSC 60 Hz).
(2) Press R/C to set Picture NORMAL condition.
(3) Connect the DC miliammeter between TP 603 ( + ) & TP 602 ( - )
(Full Scale: 3mA Range).
(4) Beam current must be within :

NTSC CHROMA ADJUSTMENT

NO ADJUSTMENT POINT
1 SUB-TINT (1) Receive the "US 10 CH HALF Color Bar" signal.
(2) Connect the oscilloscope to JA410 or TP853 BLUE-OUT
(I2C BUS CONTROL)
(3) Select the service data V02 . On Y-mute using the R/C.
(4) Adjust the V02 (Sub tint) data to obtain the waveform as shown in Figure 1.1
(B-Amp Base (TP853) must be in stepping level)
*REMARK : PLEASE MAKE SURE USE RF SIGNAL DURING SUB TINT ADJUSTMENT
2 SUB COLOR (1) Receive the "US 10 CH HALF Color Bar" signal.
(2) Make the image normal with the remote controller.
(I2C BUS CONTROL) (3) Connect the oscilloscope to JA401 (TP851) RED-OUT.
(to be done after
sub tint adj)
(4) Select the service data V03. Adjust the V03 (Sub color) data to obtain the waveform
adjustment shown in Fig. 1-2.
(5) Fig 1.2 waveforms shows that the 75% white & red portions of color bar at the same level
*REMARK : PLEASE MAKE SURE USE RF SIGNAL DURING SUB COLOUR ADJUSTMENT
ADJUSTMENT CONDITION / PROCEDURE
Service
Luminance Tolarance (cd/m2)
Mode (cd/m2)
Upper Limit Lower Limit
Enable 1.5 +0.5 -0.5
Disable 1.5 +1.5 -0.5
Service
Luminance Tolarance (cd/m2)
Mode (cd/m2)
Upper Limit Lower Limit
Enable 150.0 +10 -10
Disable 150.0 +10 -10
1000 ± 100μA
ADJUSTMENT CONDITION / PROCEDURE
Range : 500mV/Div (AC) (Use Probe 10:1)
Sweep time : 10 sec/Div
Range : 500mV/Div (AC) ( Use Probe 10:1)
Sweep time : 10 sec/Div
5 – 10
WAVEFORM OR OTHERS
US14
Dark White
US14
White
WAVEFORM OR REMARKS
Fig 1-1
Cy
G
100% WHITE
R
W Y Mg B
Fig 1-2