goldstar 20a30h free download

File name tv20a30.pdf

ADJUSTMENT INSTRUCTION These instructions are applied to only NC-5AA chassis. Notes 1.So this is a hot chassis, you must be careful, and be caution not to touch 1st and 2nd concurrently. 2.Adjustment must be done in the correct order. 3.Power supply of a SET which is adjusted is 100~240V A.C./50~60Hz. 4.The receiver must be operated for about 30 minutes proir to the adjustment. 2) Connect H.Scope and Pulse output of Sweamer Generator to H.Input and Marker input of Alignment Scope, respectively. 3) Apply AGC Voltage(D.C.) to TP11 of IC201.(7.5±0.05V) 4) Apply B+ of IC201 to TP12 of R591.(12.0±0.1V) 5) Set VR526(AGC Adjustment) to mechanical center. 1.3. Adjustment A. VCO 1) Set the vertical range of Alignment Scope to 1V/DIV and CAL position, and, by applying D.C. 0~9V, do DC Calibration to place D.C 4.5V point of waveform to center of Screen. 2) Connect the Input terminal of Alignment Scope to TP3(Video Detection Output), and set Vertical Variable Switch to CAL position. 3) Apply AGC Voltage to TP11 of IC201 through 470§ to be 7.5±0.05V 4) Adjust L501 so that BEAT appears on 45.75MHz Marker like If not, adjust again after attenuating output 10 ~20dBu. f (MHz) 42.75 45.0 47.25 CONTENTS 1) VIF, AFT and SIF Adjustment 2) Sound Multiplex Adjustment 3) FOCUS Adjustment 4) AGC Adjustment 4)-1 Picture AGC Adjustment 5) V-Size and V-Center Adjustment 6) Horizontal Size, Center and Side Pincushion Adjustment 7) Purity and Convergence Adjustment 8) White Balance Adjustment 9) SUB-Bright Adjustment 10) Vertical Center Adjustment 11) Horizontal Center Adjustment 1. VCO and AFT Adjustment This Adjustment must be applied only to PCB Assy. 1.1. Necessary Instruments 1) Sweamer Generator : can sweep 35MHz~55MHz(over 120dBu) 2) PLUG in Unit : With PIF(45.75MHz), SIF(41.25MHz) Marker 3) Alignment Scope : X-Y mode, 10mV~20V Variable 4) D.C. Power Supply : 0~12V Variable 5) D.C. Power Supply : 13.5V±0.2V (over 300mA) 6) Digital Multimeter 45.75MHz (Turn L105 so that the position of Beat is same with 45.75MHz Marker)

B. AFT 1) Connect the Input of Alignment Scope to TP4 with keeping DC voltage of 2pin of IC201. 2) Keep the output of Sweamer Generator 100±5dBu. 3) Adjust L506 so that waveform of Alignment Scope to be that of . 4) Adjust Vertical Volume of Alignment Scope to place DC level of waveform to center (4.5V) and 45.75MHz Marker to 7.5VЎ 0.5V. 45.75 MARKER 1.2. Preliminary Steps 1) Connect the output of Sweamer Generator like . Here, set the output of Sweamer Gen. to 100±5dBu. POWER SUPPLY + 470/0.5W 7.5V TP11 + VCO COIL 2 51 L501 9V 8V C508 50 TP4 47 R507 TUNER IF TP2 SAW FILTER C122 9 R520 AFT COIL 9V L506 IC501 LA7674 46 45 C521 AFT 8 0V Q503 44 11 R518 14 R517 L503 Z502

VCO TP3 12.5V + L502 SWEEMAR GENERATOR 2. SIF Adjustment 2.1. Necessary Instruments 1) Sweamer Generator : can sweep 3~6MHz 2) Plug In Unit : with 4.5MHz Marker 3) Alignment Scope : X-Y mode(can measurable 10mV~ 20