TOSHIBA MD20FM3
Service Manual

ELECTRICAL ADJUSTMENTS
2-5: 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 (04) on the remote control to select "G DRV". 5. Press the CH. UP/DOWN button on the remote control to select the "R CUT", "G CUT", "B CUT", "G DRV" or "B DRV". 6. Adjust the RIGHT/LEFT button on the remote control to whiten the R CUT, G CUT, B CUT, G DRV, and B DRV at each step tone sections equally. 7. Perform the above adjustments 5 and 6 until the white color is looked like a white. 2-6: 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 (19) 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. 2-7: 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 (26) on the remote control to select "WIDS". 4. Press the RIGHT/LEFT button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes 10 ± 2%. 2-8: VERTICAL SHIFT 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 (20) on the remote control to select "VPOSI". 4. Press the RIGHT/LEFT button on the remote control until the horizontal line becomes fit to the notch of the shadow mask. 2-9: 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 (21) on the remote control to select "VSIZE". 4. Press the RIGHT/LEFT button on the remote control until the Up/Down OVER SCAN Quantity becomes equal to the Right/Left OVER SCAN Quantity. 5. Receive a broadcast and check if the picture is normal. D-2 2-10: VERTICAL LINEARITY NOTE: Adjust after performing adjustments in section 2-9. After the adjustment of Vertical Linearity, reconfirm the Vertical Shift 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 (22) 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. 2-11: PARABOLA CORR 1. Receive the rainbow pattern 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 (24) on the remote control to select "DPCS". 4. Press the RIGHT/LEFT button on the remote control until the right and left vertical lines are straight. 2-12: TRAPEZIUM 1. Receive the rainbow pattern 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 (25) on the remote control to select "KEYS". 4. Press the RIGHT/LEFT button on the remote control until the both vertical lines of the screen become parallel. 2-13: CORNER CORR TOP Receive the rainbow pattern from the Pattern Generator. 1. Using the remote control, set the brightness and 2. 3. contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and

press the channel button (31) on the remote control to select "CNRT". 4. Press the RIGHT/LEFT button on the remote control until the upper section of the both ends vertical lines are straight. 2-14: CORNER CORR BOTTOM 1. Receive the rainbow pattern 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 (32) on the remote control to select "CNRB". 4. Press the RIGHT/LEFT button on the remote control until the bottom section of the both ends vertical lines are straight.