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JVC AV20F703
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of JVC AV20F703 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 10 (click to view)
AV-20F703

ELECTRICAL ADJUSTMENTS
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 (04) on the remote control to select “H. POSI”. 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. 2-7: VERTICAL POSITION Receive the monoscope pattern. 1. 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 “V. POSI”. 4. Press the VOL. UP/DOWN button on the remote control until the horizontal line becomes fit to the notch of the shadow mask. 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 “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 9 ± 2%. 2-9: VERTICAL LINEARITY NOTE: Adjust after performing adjustments in section 2-8. 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 “V. LIN”. 4. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum. 2-10: LEVEL 1. Receive the monoscope pattern (70dB). 2. Connect the AC voltmeter to pin 6 of CP101 and the pin 1 (GND) of CP101. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (36) on the remote control to select “LEVEL”. 4. Press the VOL. UP/DOWN button on the remote control until the AC voltmeter is 75 ± 2mV. 2-11: SUB BRIGHTNESS 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (16) on the remote control to select “BRI. CENT”. 2. Press the VOL. UP/DOWN button on the remote control until the brightness step No. becomes “50”. 3. Receive a broadcast and check if the picture is normal. 4. Press the INPUT button on the remote control to set to the AV mode. Then perform the above adjustments 1~3. 5. Press the INPUT button on the remote control to set to the CS mode. Then perform the above adjustments 1~3. 2-12: TINT/COLOR CENT 1. Receive the color bar pattern. (RF Input) 2. Connect the oscilloscope to TP806. 3. Using the remote control, set the brightness, contrast, color and tint to normal position. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (26) on the remote control to select “TINT”. 5. Press the VOL. UP/DOWN button on the remote control until the section “A” becomes a straight line (Refer to Fig. 2-1). 6. Connect the oscilloscope to TP804. 7. Press the channel button (24) on the remote control to select “COL. CENT”. 8. Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 4.4 scales on the screen of the oscilloscope. 9. Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 115 ± 10% of the white level. (Refer to Fig. 2-2) 10. Receive the color bar pattern. (Audio Video Input) 11. Press the INPUT button on the remote control to set to the AV mode. Then perform the above adjustments 2~9. 12. Press the INPUT button on the remote control to set to the CS mode. 13. Activate the adjustment mode display of Fig. 1-1 and press the channel button (26) on the remote control to select “TINT”. 14 Press the VOL. UP/DOWN button on the remote control until the tint step No. becomes “50”. 15. Press the channel button (24) on the remote control to select “COL. CENT”. 16. Press the VOL. UP/DOWN button on the remote control until the color step No. becomes “62”. 17. Receive a broadcast and check if the picture is normal.

“A” Fig. 2-1

10

No. 52001

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