matsui ma20ot free download

File name Ma20OT.pdf

MATSUI 20 OT General Information Also Covers 20 OR & 200 T & 200 R 1 2-3: CUT OFF 1. Receive the color bar pattern. 2. Set the AFT switch ON position. 3. Connect the oscilloscope to TP802 4. Adjust VR803 until voltage is 150VDC (20") 140VDC (14") (Refer to Fig. 2-3) 2-4: FOCUS 1. Receive the broadcasting signal. 2. Adjust the focus control until picture is distinct. 2-5: VERTICAL SIZE 1. Receive the crosshatch pattern from the color bar generator. 2. Adjust the bright and contrast controls until the crosshatch pattern is distinct. 3. Adjust VR401 until the center of crosshatch is square. 4. Receive broadcasting signal, then confirm picture is normal. 2-6: VERTICAL POSITION 1. Receive the color bar pattern. 2. Using the remote control, set brightness and contrast to maximum position. 3. Adjust the value of R424 and R425 until horizontal line of the color bar comes to approximate center of the CRT. NOTE R424 and R425 are fixed components. Use a variable resistor or capacitor to determine the optimal value and insert that value component. Lessen the value of R424. Picture will move 4mm up. Lessen the value of R425. Picture will move 4mm down. 2-7: HORIZONTAL POSITION 1. Receive the color bar pattern. 2. Using the remote control, set brightness and contrast to maximum position. 3. Adjust VR403 until the color width of both screen edges are equal. 4. Receive the broadcasting signal, then confirm picture is normal. CRT (200R) Diagram Electrical Adjustments 1. BEFORE MAKING ELECTRICAL ADJUSTMENTS Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies. CAUTION Use an isolation transformer when performing any service on this chassis. Before removing the anode cap, discharge electricity because it contains high voltage. When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use only specified silicon grease (YG6260M). Remove all old silicon before applying new silicon. 1-1: Prepare the following measurement tools for electrical adjustments. 1. 2. 3. 4. Sweepmarker Generator Oscilloscope Digital Voltmeter Color Bar Generator 2-2-A: BRIGHT 1. Receive the monochrome pattern. 2. Activate the adjustment mode display and press the 6 key. 3. Press the VOL. UP/DOWN key on the remote control until 0% of gray scale begins to lighten. 2-2-B: AGC NOTE Adjust after performing adjustments in section 2-1. In case of weak electric field. 1. Tune to a noisy channel. 2. Activate the adjustment mode display and press the 3 key. 3. Press the VOL. UP/DOWN key on the remote control until noise is at minimum. 4. Change the channel, confirm that the other channels are normal. In case of strong electric field. (Radio frequency interference can cause diagonal streaks to appear.) 1. Activate the adjustment mode display and press the 3 key. 2. Press the