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ELECTRICAL ADJUSTMENT
ITEM �H (free-running frequency of Hor. oscillator) ADJUSTMENT PROCEDURE 1. Receive NTSC signal. 2. Short the terminal �TP +9V � and the terminal � TP (Free run) � on the signal board with a jumper wire. 3. Connect the probe of frequency counter to the lead of R426 and GND. 4. Adjust the frequency to �33.75±0.2 kHz� by turning R4034 on DPC Board. 5. Disconnect the shorted wire, then confirm that the picture is synchronized. 1. 2. 3. 4. Receive NTSC signal. Connect he probe of digital voltmeter to TP-V and TP-G on SIGNAL Board. Call up the adjustment mode display, then select the item VCEN. Press the VOLUME s or t button to get the voltage 0±10 mV.
VERTICAL POSITION (VCEN)
PICTURE POSITION 1. Receive NTSC signal. (HPOS) 2. Call up the adjustment mode display. 3. Select the item �HPOS�, and adjust the data to �80H�. 4. Adjust the picture position alternately by turning CENTERING MAGNETS for proper picture position. 5. Check the picture with off-air signal.
SPECIFIC INFORMATIONS GENERAL ADJUSTMENTS
WIDTH (WID)
1. Receive NTSC signal. 2. Select the "FULL" mode by PIC SIZE button on Remote Control. 3. Call up the adjustment mode display, then select the item WID. 4. Press the VOLUME s or t button to get the picture so that left and right eddes of video signal begin to lack. 5. Press the VOLUME s button to advance the data by 8 steps. NOTE: Check the horizontal picture position is correct.
SUB-BRIGHTNESS (BRTC)
1. 2. 3. 4. 1. 2. 3. 4. 5.
Receive the air signal or aux Video signal. Enter sports mode on user menu. Enter the service mode, then select �BRTC� register. Adjust the data to set dark area of picture to proper level. Receive color-bar signal from color-bar generator. Adjust the BRIGHTNESS and CONTRAST to the center (RESET status). Connect oscilloscope to TP501on the MAIN board. Blue Enter the service mode, then select �SCOL�. Magenta Adjust the data value to achieve 1.8V0-p of blue bar on scope.
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