Electrical Adjustment; Video Output (Luminance Signal) Adjustment; Video Output (Chrominance Signal) Adjustment - Yamaha DVD-S795 Service Manual

ELECTRICAL ADJUSTMENT

1. Video Output (Luminance Signal) Adjustment

Do this adjustment after replacing a C.B.A.
Measurement point
Video output terminal
Measuring equipment, tools
Screwdriver, Oscilloscope
200mV/div, 10 sc/div
Purpose: To maintain video signal output compatibility.
1. Connect the oscilloscope to the video output terminal and terminate at 75 ohms.
2. Adjust VR3501 so that the luminance signal (Y+S) level becomes 1000 mVp-p–20 mV.

2. Video Output (Chrominance Signal) Adjustment

Do this adjustment after replacing a C.B.A.
Measurement point
Video output terminal
Measuring equipment, tools
Screwdriver, Oscilloscope
200mV/div, 10 sc/div
Purpose: To maintain video signal output compatibility.
1. Connect the oscilloscope to the video output terminal and terminate at 75 ohms.
2. Adjust VR3511 so that the chrominance signal (C) level becomes 675 mVp-p–13 mV.
Adjustment point
PLAY (Title 46): DVDT-S15
VR3501(mother C.B.A.)
PLAY (Title 10): DVDT-S01
Adjustment point
VR3511(mother C.B.A.) PLAY (Title 46): DVDT-S15
PLAY (Title 10): DVDT-S01
2 - 17
Mode
Color bar 75% DVDT-S15 (AX07320)
or
DVDT-S01 (TX946080)
Adjustment value
1000mVp-p±13mV
VR3501
Mode
Color bar 75% DVDT-S15 (AX07320)
or
DVDT-S01 (TX946080)
Adjustment value
675mVp-p±13mV
Disc
Screw driver
Disc
Screw driver
VR3511