TOSHIBA MV20P2
Manual de Servicio

ELECTRICAL ADJUSTMENTS
2-6: WHITE BALANCE
CH-2

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. 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 (10) on the remote control to select "R CUT OFF". 5. Using the VOL. UP/DOWN button on the remote control, adjust the R CUT OFF. 6. Press the CH. UP/DOWN button on the remote control to select the "R DRIVE", "B DRIVE", "G CUT OFF" or "B CUT OFF". 7. Adjust the VOL. UP/DOWN button on the remote control, adjust the R DRIVE, B DRIVE, G CUT OFF or B CUT OFF at each step tone sections equally. 8. Perform the above adjustments 6 and 7 until the white color is looked like a white. 2-7: FOCUS 1. Receive the monoscope pattern. 2. Using the remote control, set the brightness and contrast to normal position. 3. Turn the Focus Volume fully counterclockwise once. 4. Adjust the Focus Volume until picture is distinct. 2-8: HORIZONTAL PHASE 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 (05) on the remote control to select "H PHAS". 4. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum. 2-9: 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 (07) on the remote control to select "V SFT". 4. Check if the step No. V. SHIFT is "03". 5. Adjust the VR401 until the horizontal line becomes fit to the notch of the shadow mask. 2-10: 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 (06) on the remote control to select "V SIZE". 4. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes 10 ± 2%. D3-2

CH-1 6.5H

Fig. 2-1-B 2-2: VCO FREERUN 1. Receive the VHF HIGH (63dB). 2. Place the set with Aging Test for more than 10 minutes. 3. Connect the digital voltmeter between the pin 5 of CP351 and the pin 1 (GND) of CP351. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (03) on the remote control to select "V.VCO". 5. Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.5V. 6. After the 2.5V adjustment, countdown the VIF VCO step No. by 1 step with the VOL. DOWN button. 2-3: RF AGC 1. Receive the VHF HIGH (63 ± 1dB). 2. Connect the digital voltmeter between the pin 5 of CP351 and the pin 1 (GND) of CP351. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (02) on the remote control to select "RF AGC". 4. Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.7 ± 0.05V.

(TV SECTION)
2-4: CONSTANT VOLTAGE 1. Using the remote control, set the brightness and contrast to normal position. 2. Connect the digital voltmeter to TP601 (R520). 3. Set condition is AV MODE without signal. 4. Adjust the VR502 until the digital voltage is 135 ± 0.5V. 2-5: CUT OFF 1. Adjust the unit to the following settings. R CUT OFF=127, G CUT OFF=127, B CUT OFF=127, SUB BRI.CENT=127, SUB CONT.MAX=100 2. Place the set with Aging Test for more than 15 minutes. 3. Set condition is AV MODE without signal. 4. Using the remote control, set the brightness and contrast to normal position. 5. Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "CUT OFF". 6. Adjust the Screen Volume until a dim raster is obtained.