Akira CT21LS9M free download

File name Color-TV-China-Akira-CT21LS9M-Chassis-3Y03.pdf

Colour TV Service Manual 2 Model: CT-21LS9MTS Chassis: 3Y03 Model No: CT-21LS9MTS Version 1.0 3 CONTENT SERVICE ADJUSTMENT ... 4 COMPLETE MACHINE GENERAL ADJUSTMENT... 6 FACTORY MENU DISCRIPTION... 8 CONTROL LOCATION... 11 INPUT & OUTPUT TERMINALS... 12 MECHANICA DISASSEMBLING ... 13 CABINET PARTS LIST... 15 CIRCUIT DIAGRAM ... 16 Model No: CT-21LS9MTS Version 1.0 4 SERVICE ADJUSTMENTS Please notice the following before alignment and equipment 1. 2. 3. 4. Don't short any two soldering points, which should not be shorted and don't touch any components, which should not be touched. Please pull out plug before equipment. For safety reasons, all components equipped or replaced should be identical with BOM. 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. 2. 3. 4. 5. 6. 7. Small (-) screwdriver Screwdriver without inductance Pattern generator DC Regulated power supply Digital voltmeter Sweep signal generator 20MHz 2-Channel oscilloscope Signal condition ITEMS 1 2 3 4 LOGO CH14 CH3 CH8 CH12 PICTURE CARRIER 471.25MHz 61.25MHz 181.25 MHz 205.25 MHz PATTERN COLOR BAR GRAY SCALE MONOSCOPE CROSS HATCH SYSTEM NTSC/M NTSC/M NTSC/M NTSC/M SOUND MODE MONO 1KHz BTSC 0.3K, 3KHz MONO MUSIC MONO 1KHz Adjust for main chassis PIF Adjustment (45.75MHz) 1. 2. 3. Tuner AGC connects to GND. Pattern generator outputs 45.75MHz IF. Signal (70db V) and connects to SAW filter output terminal through a capacitor. Connect digital voltmeter across C227. DC regulated power supply positive terminal output +14V to C617. 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. Model No: CT-21LS9MTS Version 1.0 5 B+ adjustment 1. 2. 3. 4. Disconnect horizon