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ADJUSTMENT MANUAL OF 3S10 CHASSIS (ONLY APPLICABLE TO ST92195 VER2.0) Written by: Han Shixin Date : Feb .2,2002 (Information herein is subject to change with prior notice.) 0 ALIGNMENT INSTRUCTION (3S10) 1. Preface This ADJUST MANUAL is only used for 3S10 chasiis, and guides to make adjust equipments. It is only a reference. 2. Instruments For Adjustment a. TV signal generator b. 20MHz 2-channel oscilloscope c. Adjust jigs d. Sweep Signal Generator(option) e. Digital voltmeter f. White balance adjust equipment. 3. How To Enter And Exit Factory Mode a. Enter factory mode by pressing MENU button, AV button and ANAL button in turn or pressing the SERVICE button(on the right of MENU button,we can add this button for easy to enter service mode in factory).Press OK to enter Service 2.0 and Design mode. b. Exit factory mode by pressing PP or pressing STANDBY button. 4. Chassis Adjust 4-1. VCO Adjust a. Set TV Signal Generator to output a 38.9MHz, stranger than 80dBuv PAL color bar signal. b. Signal inputs to TUNER's IF terminal or pin5 of SAW101 through a 0.01UF/50V capacitor c. Connect 220V AC (50/60Hz) and Switch on power switch. Enter Service 2.0 menu. d. Press AV button after picking out VCO Coarse or VCO Fine item by PROG+/- buttons. VCO is well adjusted automatically if the character OK appears at the bottom of screen. (If OK can not appear automatically,please fine tune LC238 and re-try again) e. The following adjustment is suitable for TV sets with SECAM L/L' system. Set TV signal Generator to output a 34.4MHz Signal ,set TV set to VHF-L band. Press AV button after picking out VCO Coarse L1 or VCO Fine L1 by PROG+/- buttons. The VCO of SECAM L' system is well adjusted if the character OK appears automatically at the bottom of screen. Note: After VCO is well adjusted,exit factory mode by pressing PP button at first, switch off power switch, then withdraw IF signal. Signal 4-2. IF Trap(LC101) Adjust For RF NTSC a. Receive RF NTSC signal. b. Adjust LC101 until picture is best.(We also can use a sweep sigmal generator to get best the trap point) 4-3. AGC Adjust a. Receive 60dBuV RF signal. b. Enter Service V2.0 mode and get Tuner AGC PAL item, adjust PAL AGC by VOL+/- buttons until picture's noise just disappears and no distortion under 100dBuV level. c. If TV has SECAM LL1 system:enter Service V2.0 mode and get Tuner AGC LL1 item, adjust SECAM LL' AGC by VOL+/- buttons until picture's noise just disappears and no distortion under 100dBuV level. d. If TV has SECAME LL1 fsystem:press OK key to enter design menu,set AGC Gain PAL to 1,set AGC Gain LL1 to 3 1 4-4.