TOSHIBA MV20FK3
Manual de Servicio

ELECTRICAL ADJUSTMENTS
2-3: RF AGC 1. Receive the VHF HIGH (70dB). 2. Connect the digital voltmeter between the pin 5 of CP602 and the pin 1 (GND) of CP602. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (02) on the remote control to select "RF DELAY". 4. Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.7 ± 0.05V. 2-4: STEREO SEPARATION 1. Receive the stereo signal. (L=2KHz, R=400Hz) 2. Connect the AC voltmeter to AUDIO OUT L/R through stereo filter (L=400Hz, R=2KHz). 3. Press the AUDIO SELECT button on the remote control to set to the stereo mode. 4. Adjust by the VR6001 so that the difference between with the stereo filter and without the stereo filter is more than 23dB. 2-8: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment. 1. Place the set with Aging Test for more than 15 minutes. 2. Receive the color bar 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. Using the VOL. UP/DOWN button on the remote control, adjust the R DRIVE, B DRIVE, G CUT OFF or B CUT OFF. 8. Perform the above adjustments 6 and 7 until the white color is looked like a white. 2-9: FOCUS 1. Receive the monoscope pattern. 2. Turn the Focus Volume fully counterclockwise once. 3. Adjust the Focus Volume until picture is distinct. 2-10: 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 PHASE". 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. TV 2-11: HORIZONTAL SIZE NOTE: Adjust after performing adjustments in section 2-10. 1. Receive the monoscope pattern. 2. Adjust the VR401 until the SHIFT quantity of the OVER SCAN on right and left becomes 10 ± 2%. B Fig. 2-3 2-12: VERTICAL SIZE NOTE: Adjust after performing adjustments in section 2-11. 1. Receive the cross hatch 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 (06) on the remote control to select "V SIZE". 4. Press the VOL. UP/DOWN button on the remote control until the rectangle on the center of the screen becomes square. 5. Receive a broadcast and check if the picture is normal.

(TV SECTION)
2-5: CONSTANT VOLTAGE 1. Connect the digital voltmeter to the FUSE HOLDER of FH503. 2. Set condition is AV MODE without signal. 3. Adjust the VR502 until the DC voltage is 111 ± 0.5V. 2-6: OSD HORIZONTAL 1. Activate the adjustment mode display of Fig. 1-1. 2. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-3)

00 OSD A 2-7: CUT OFF

15

1. Adjust the unit to the following settings. R CUT OFF=128, G CUT OFF=128, B CUT OFF=128, R DRIVE=64, B DRIVE=64, BRIGHTNESS=128, CONTRAST=100 2. Place the set with Aging Test for more than 15 minutes. 3. Set condition is AV MODE without signal. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "CUT OFF". 5. Adjust the Screen Volume until a dim raster is obtained.