. Various china ctv37v10 ch 3401 3y01 ctv55v10 ch 4401 4y01 with la8633xx la7681 - adj 937 free download

File name china_ctv37v10_ch_3401_3y01__ctv55v10_ch_4401_4y01___with_la8633xx_la7681__-_adj_937.pdf

CHASSIS ALIGNMENT 1. PIF Adjustment 1-1 Tuner AGC connects to GND. Pattern Generator outputs 38.9MHz R.F. signal and connects to tuner IF output terminal or pin 5 of saw filter. 1-2 Connect Digital voltmeter across C227. DC Regulated power supply positive terminal output +20V to pin 1 of IC302 and negative terminal of D608. DC Regulated power supply negative terminal connects to pin 2 of IC302. 1-3 Adjust L203 coil to obtain 3.6V Digital voltage meter reading. 2. System NTSC Adjust(L108) 2-1 Tuner AGC connects to GND. Connect Sweep Signal Generator to tuner IF output terminal. Sweep oscilloscope V-IN terminal connects to C109. And connect Q102 'b' pole to the power terminal of R104. (shown in FIG.2) Sweep Signal Sweep DC Regulated Generator Osciloscope Power Supply 2-2 Apply +20V DC across IC302 as shown in FIG.2. 2-3 Adjust L108 to obtain waveform as following. There will be no alignment to it without NTSC system. 3. B+ adjustment 3-1 Disconnect horizontal load. Connect a light bulb (100 W) AC 250V across C321. 3-2 Connect 220V AC 50 Hz to CN601 and switch on power switch. 3-3 Test the voltage with digital voltage meter between C321 two terminals. 3-4 Adjust VR601 to obtain +110V +/- 0.5V. 4. AGC alignment 4-1 Receive 60dB +/- 2dB RF signal. Connect Digital voltmeter positive terminal to AGC terminal of TUNER and negative terminal to GND. 4-2 Press "MENU" key twin, till the PICTURE MENU appears, then press "Q.VIEW" key, "MUTE" key to turn on CPU. TV SET will go to factory mode. Press "TIMER" key to go to the next factory menu. Go to "MENU 3" status by this means. 4-3 Select RF.AGC by pressing "CH+" or "PROG+" and "CH." or "PROG-" keys. Adjust "VOL+" and "VOL-" keys to obtain 4V Digital voltage meter reading. 4-4 Press "MENU" key to exit factory mode. COMPLETE MACHINE GENERAL ADJUSTMENT 1. Go to factory mode according to 4-4-2 before warm up line, 2. Focus Adjustment. 2-1 Receive monoscope pattern. 2-2 Set TV to work in dynamic status. 2-3 Adjust the focus knob of FBT to get the clearest picture. 3. Screen Voltage Adjustment. 3-1 Go to factory mode "MENU 2" status according to 4-4-2. 3-2 Select "V-KILL" by pressing "CH+" or "PROG+" and "CH-" or "PROG-" keys.. 3-3 Press "VOL+" key all the time, Adjust the screen knob of FBT to get a horizontal faintness beam line. Then loose "VOL+" key. 4. White Balance Adjustment (Applied In factory only) 4-1 Set the TV set to AV mode. Receive black white pattern (Color Temperature test pattern). 4-2 Insert 6 Pin Service flat cable into CN002. Press adjustment keys, and then go to automatic white balance adjustment. 4-2 After adjusting well, remove the 6 Pin Service flat cable. 4. (1) White Balance adjustment (Applie