Kenwood LZ-702W Service Manual

Also see for LZ-702W: Training guide Instruction manual

Contents

LZ-702W12Step Positive/Negative Appraisal Sampling Enabling Line1st step 23 24H~35H2nd step 43 44H~55H3rd step 63 64H~75H4th step 83 84H~95H5th step 103 104H~115H6th step 123 124H~135H7th step 143 144H~155H8th step 163 164H~175HProcess/Requirements for data sampling∗ When γ IC serial data is changed, more wait time is requiredthan shown below.NTSC/PAL switching ................. Approx. 500msAGC ON/OFF ............................ Approx. 500msγ AMP ON/OFF ......................... Less than 1msPICTURE .................................. Less than 1msCOLOR ..................................... Less than 1msTINT .......................................... Less than 1msPHASE ...................................... Less than 1msCONT-VIDEO ............................ Less than 1msCONT-RGB1,2 .......................... Less than 1msGAMMA1 .................................. Less than 1msGAMMA2 .................................. Less than 1msRGB_AMPLITUDE .................... Approx. 100msBRIGHT .................................... Approx. 100msSUB-BRIGHT R,B ..................... Less than 1msCOM_AMPLITUDE ................... Less than 1msCOM_DC .................................. Less than 1msDA_COUT ................................. Less than 1ms∗ Adjusting q~i input signal/setting up selectorInput signal: Monochrome 8 steps RGB picture by OSD_ICSetting up the selector:V MUTE HFULL OSD HV SEL LAdjustment qRGB AMPLITUDE (RGB Amplitude control)Sampling the LCD_G voltage value at the 2nd step, and ad-just to the adaptation value. (V_MUTE: H)Positive/negative appraisal at the 2nd step is run at 43H,and sampling is run between 44H and 53H.q Starting with the OSD_VSYNC pulse leading edge,count the OSD_HSYNC pulse until a positive/nega-tive appraisal at 43H of the 2nd step.w Check to see if VCOM_IN pulse at 43H is above orbelow 1.6V.e-1 If VCOM_IN at 43H is below 1.6V, sampling VG volt-age value b from 44, 46, 48, 50, 52 at 5H five times,and sampling VG voltage value a from 45, 47, 49, 51,53 at 5H five times.e-2 If VCOM_IN at 43H is below 1.6V, sampling VG volt-age value a from 44, 46, 48, 50, 52 at 5H five times,and sampling VG voltage value b from 45, 47, 49, 51,53 at 5H five times.(The timing of sampling is at 38.0μsec±15 from theleading edge of H)r Eliminate the maximum and minimum value from thesampled voltage value a/voltage value b data (fivetimes), and calculate the average.t Calculate the VG amplitude by subtract averaged volt-age value a from averaged voltage value b.y Change the RGB_AMPLITUDE setting on the valuefrom t and adjust to the adaptation value.∗ Keep the above average voltage a for adjustmentwert.Adjustment wertBRIGHT, GAMMA1, CONT-RGB2, GAMMA2Example: Sampling the voltage value at the 3rd step, andadjust to the adaptation value.Positive/negative appraisal at the 3rd step is run at 63H, andsampling is run between 64H and 73H.q Starting with the OSD_VSYNC pulse leading edge,count the OSD_HSYNC pulse until a positive/nega-tive appraisal at 63H of the 3rd step.w Check to see if VCOM_IN pulse at 63H is above orbelow 1.6V.e-1 If VCOM_IN at 63H is below 1.6V, sampling VG volt-age value c from 65, 67, 69, 71, 73 at 5H five times.e-2 If VCOM_IN at 63H is above 1.6V, sampling VG volt-age value c from 64, 66, 68, 70, 72 at 5H five times.(The timing of sampling is at 38.0μsec±15μsec fromthe leading edge of H)r Eliminate the maximum and minimum value from theab1.6VGND38.0μsec ±15 38.0μsec ±151.6VVGV COMOSD HSYNCbADJUSTMENT