TOSHIBA MD24F51
Service Manual

ELECTRICAL ADJUSTMENTS
2-4: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment. 1. Place the set with Aging Test for more than 15 minutes. 2. Receive the gray scale pattern from the Pattern Generator. 3. Using the remote control, set the brightness and contrast to normal position. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (16) on the remote control to select "G DRIVE". 5. Press the CH. UP/DOWN button on the remote control to select the "R CUT OFF", "G CUT OFF", "B CUT OFF", "R DRIVE" or "B DRIVE". 6. Adjust the RIGHT/LEFT button on the remote control to whiten the R CUT OFF, G CUT OFF, B CUT OFF, R DRIVE, and B DRIVE at each step tone sections equally. 7. Perform the above adjustments 5 and 6 until the white color is achieved. 2-5: HORIZONTAL POSITION 1. Receive the monoscope pattern. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (04) on the remote control to select "HPOSI". 4. Press the RIGHT/LEFT button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum. 2-6: HORIZONTAL SIZE 1. Receive the monoscope pattern. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (69) on the remote control to select "E/WDC". 4. Press the RIGHT/LEFT button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes 12 ± 2%. 2-7: VERTICAL POSITION 1. Receive the monoscope pattern. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (08) on the remote control to select "VPOSI". 4. Check if the step No. V POSI is "02". 5. Adjust the VR404 until the horizontal line becomes fit to notch of the shadow mask. horizontal line

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Notch

Shadow mask Fig. 2-1 2-8: VERTICAL SIZE 1. Receive the monoscope pattern. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (07) on the remote control to select "VSIZE". 4. Press the RIGHT/LEFT button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes 10 ± 2%. 5. Receive a broadcast and check if the picture is normal. 2-9: VERTICAL LINEARITY NOTE: Adjust after performing adjustments in section 2-7. After the adjustment of Vertical Linearity, reconfirm the Vertical Position and Vertical Size adjustments. 1. Receive the monoscope pattern. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (09) on the remote control to select "VLIN". 4. Press the RIGHT/LEFT button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum. 2-10: TRAPEZIUM 1. Receive the crosshatch signal from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (71) on the remote control to select "E/WTILT". 4. Press the RIGHT/LEFT button on the remote control until the both vertical lines of the screen become parallel. 2-11: PARABOLA 1. Receive the crosshatch signal from the Pattern Generator. 2. Using the remote control, set the brightness and contrast to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (70) on the remote control to select "E/WAMP". 4. Press the RIGHT/LEFT button on the remote control until the right and left vertical lines are straight. D-2