Sharp 21G-FX10L, Service Manual

Page: 17 / 49

21G-FX10L
5 – 10
SCREEN, WHITE BALANCE, SUB-BRIGHTNESS & SUB-CONTRAST ADJUSTMENT(2)
NO ADJUSTMENT POINT ADJUSTMENT CONDITION / PROCEDURE WAVEFORM OR OTHERS
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 at
Dark White
position
white balance adj)
(as attach drawing), adjust
V04
Bus data until
BRIGHTNESS Y
=
1.5cd/m2
(I2C BUS CONTROL)
Service
Luminance
Mode (cd/m2)
Upper Limit Lower Limit
Enable 1.5 +0.5 -0.5
Disable 1.5 +1.5 -0.5
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 at
White
position
white balance adj,
(as attach drawing), adjust
V01
Bus data until
BRIGHTNESS Y = 150cd/m2
sub-brightness adj)
(I2C BUS CONTROL)
** NOTE: Allowable Data for V01 >=90, even Y can't match the spec
Service Luminance
Mode (cd/m2)
Upper Limit Lower Limit
Enable 150.0 +10 -10
Disable 150.0 +10 -10
White
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 :
1000 ± 100μA
Tolarance (cd/m2)
US14
Tolarance (cd/m2)
Dark White
US14
NTSC CHROMA ADJUSTMENT
NO ADJUSTMENT POINT ADJUSTMENT CONDITION / PROCEDURE WAVEFORM OR REMARKS
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)
Range : 500mV/Div (AC) (Use Probe 10:1)
Sweep time : 10 sec/Div
(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
Fig 1-1
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)
Range : 500mV/Div (AC) ( Use Probe 10:1)
Sweep time : 10 sec/Div
(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
Fig 1-2
W
Y
Cy
G
100% WHITE
Mg
R
B