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File name CTV-221SR - PAGE 15-26.PDF

Service Adjustments Please notice the following before alignment and equipment 1. Don't short any two soldering points, which should not be shorted and don't touch any components, which should not be touched. 2. Please pull out plug before equipment. 3. For safety reasons, all components equipped or replaced should be identical with BOM. 4. Must be warm up for 30 minutes or more and degauss CRT thoroughly with demagnetizer before alignment. The data of EEPROM must be stored before the adjustment for main chassis. And EEPROM must be corrected by the correct file "3Y03_ROM_CORRECT.hex" to avoid signal of CH6 weaken. R.bias, G.bias, B.bias, R.drv, G.drv, B.drv should be set to proper values. Sub_bright is set to 63 usually. Tools and equipments for adjustment 1. small "-" screwdriver 2. screwdriver without inductance 3. Pattern Generator 4. DC Regulated power supply 5. Digital Voltmeter 6. Sweep Signal Generator 7. 20MHz 2-channel Oscilloscope Signal condition PICTURE SOUND ITEMS LOGO PATTERN SYSTEM REMARK CARRIER MODE MONO 1 CH14 471.25 MHZ COLOR BAR NTSC/M 1KHz BTSC 2 CH3 61.25 MHz GRAY SCALE NTSC/M 0.3k,3kHz MONO 3 CH8 181.25 MHz MONOSCOPE NTSC/M MUSIC MONO 4 CH12 205.25 MHz CROSS HATCH NTSC/M 1KHz Adjust for main chassis PIF Adjustment (45.75MHz) a. Tuner AGC connects to GND. Pattern Generator outputs 45.75MHz I.F. signal (70dbµV)and connects to SAW filter output terminal through a capacitor . b. Connect Digital voltmeter across C227. DC Regulated power supply positive terminal output +14V to C617. c. Adjust L203 coil to obtain 3.6V Digital voltage meter reading. NOTE: To cancel this adjustment , L203 can be adjusted before inserted to the chassis with a special equipment. -12- Service Adjustments B+