TOSHIBA MD20F11
Manual de Servicio

ELECTRICAL ADJUSTMENTS
2-4: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment. 1. Place the set in 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: 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 "01". 5. Adjust the VR402 until the horizontal line becomes fit to notch of the shadow mask. (Refer to Fig. 2-1) 2-7: 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 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. 2-8: 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. 2-9: SEPARATION 1. Set the multi-sound signal generator L-ch=1KHz, R-ch =Non input and receive the RF signal. 2. Connect the oscilloscope to the SP351 code. 3. Press the AUDIO SELECT button on the remote control to set to the stereo mode. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (64) on the remote control to select "SEPAL". 5. Press the RIGHT/LEFT button on the remote control to adjust it until the R-ch output becomes minimum. 6. Press the CH UP button 1 time to set to "SEPAH" mode. 7. Press the RIGHT/LEFT button on the remote control to adjust it until the R-ch output becomes minimum. 8. Set the multi-sound signal generator L-ch=Non input, R-ch=1KHz and receive the RF signal. 9. Connect the oscilloscope to the SP352 code. Then perform the above adjustments 3~7.

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Notch

Shadow mask Fig. 2-1

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