Kenwood KVT-910DVD Service Manual page 46

KVT-910DVD/920DVD/930DVD/
940DVD/960DVD
X35 Gamma Timing Controller Circuit Adjustment Specification
Power Supply Voltage : 14.4V
Item
1. Free-run frequency
adjustment
2. Screen display start
position adjustment
3. Input signal
4. Gamma curve
adjustment
48
ADJUSTMENT
Adjustment Method & Value
Adjust non-input HSY frequency to 15.734KHz ± 0.01KHz
at qVR70 (f0).
• On the mono-scope screen, set right and left equal or adjust
the phase difference between the HSY dropping edge and
rising edge of SYNC of the timing control IC to 2.1µSec by
wVR40 (NAV).
7 5
Input composite SYNC (10step signal) to SYNC input.
A. Adjust SYNC-SYNC level to 4.0 ± 0.1Vp-p at eVR91
(RGB AMP).
B. Adjust to 3.5V ± 0.1V at tVR96 (GMA0), yVR95 (GMA2),
uVR94 (CONT).
C. Adjust the fourth step from the pedestal to 3.0V ± 0.1V at
rVR90 (BRT).
4.0V
D. Adjust the third step from the pedestal 1.0V ± 0.1V at
tVR96 (GMA0).
4.0V
E. Adjust the fourth step from the pedestal to 2.0V ± 0.1V at
rVR90 (BRT).
(Note) There are two points to be set to 2V. Be sure to turn
to clock-wise directioin.
4.0V
5 7
0.7V
3.0V
1.0V
2.0V
Condition
• Non-input Video
• Mono-scope
• Box side
To video input
• Input signal
Composite input
(10-step signal)
• Set to AC range
• Oscilloscope
0.5V/DIV
• Input signal
composite input
(10-step signal)
• Set to AC range.
• Oscilloscope
0.5V/DIV
• Input signal
composite input
(10-step signal)
• Set to AC range.
• Oscilloscope
0.5V/DIV