Sharp 21SFX10L Service Manual - Page 19

SCREEN, WHITE BALANCE, SUB-BRIGHTNESS & SUB-CONTRAST ADJUSTMENT(2) NO ADJUSTMENT POINT ADJUSTMENT CONDITION / PROCEDURE 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) 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 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 NTSC CHROMA ADJUSTMENT NO ADJUSTMENT POINT ADJUSTMENT CONDITION / PROCEDURE 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 : 10μsec/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 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 : 10μsec/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 MS LEVEL ADJUSTMENT NO ADJUSTMENT POINT ADJUSTMENT CONDITION / PROCEDURE 1 MS LEVEL (1) Receive the "US 10 CH HALF Color Bar" signal. ADJUSTMENT (2) Connect the oscilloscope to IC3003 pin 17 ( C3014 -VE). (I2C BUS CONTROL) (3) Set the sound volume control more than 1. (4) Adjust the bus data M01 until the voltage of IC3003 pin 17 (C3014 -VE) become as follows: 530m (+18m,-35m) Vrms 21S-FX10L WAVEFORM OR OTHERS US14 Dark White US14 White WAVEFORM OR REMARKS Fig 1-1 Cy G 100% WHITE WY Fig 1-2 Mg R B WAVEFORM OR REMARKS 5 - 7