Kenwood DDX7015 Service Manual page 26

DDX7015/7025/7035
DDX7045/7065
Chroma Adjustment Method
• While pressing on EJECT+SRC on the Unit (X14), press
RESET to enter the Test Mode. (Refer to Remote Controller
Operating Method 1.)
• Press DIRECT key on the TV remote controller and get into
the Chroma Adjustment mode. (Refer to Remote Controller
Operating Method 3.)
No. Adjustment Item Test Mode
3-A Chroma VCO
3-B Brightness
3-C Contrast
3-D Black limiter
3-E White limiter
3-F Y GCA
(Brightness gain)
3-G Gamma 1
3-H Gamma 2
3-I R sub-brightness
3-J B sub-brightness
26
ADJUSTMENT
Adjustment Method
CH : 16 Using the jig, connect to GND the TP-HD (R382 between R383)
and TP-VD (R380 between R381).
Adjust the IC303 32pin waveform, using a frequency counter.
CH : 6 Monitor the TP (CN850 59pin) waveform, using an oscilloscope.
Adjust the amplitude value so that the waveform between the
1 step signal to the negative 1 step signal.
CH : 13 Monitor the TP (CN850 59pin) waveform, using an oscilloscope.
Adjust the amplitude value so that the waveform between the
8 step signal to the negative 8 step signal.
CH : 5 Keep 7F and confirm and then move to the next item.
CH : 10 Keep 7F and confirm and then move to the next item.
CH : 2 Monitor the TP (CN850 59pin) waveform, using an oscilloscope.
Adjust the amplitude value so that the waveform between the
pedestal to the 9 step signal.
CH : 11 Monitor the TP (CN850 59pin) waveform, using an oscilloscope.
Adjust the amplitude value so that the waveform between the
pedestal to the 2 step signal.
CH : 12 Monitor the TP (CN850 59pin) waveform, using an oscilloscope.
Adjust the amplitude value so that the waveform between the
pedestal to the 10 step signal.
CH : 8 Monitor the TP (CN850 58pin and 59pin) waveform, using an
oscilloscope.
It is adjusted so that 58pin signal level higher 0.1V than 59pin
signal (for 1 step signal).
CH : 9 Monitor the TP (CN850 60pin and 59pin) waveform, using an
oscilloscope.
It is adjusted so that 60pin signal level higher 0.1V than 59pin
signal (for 1 step signal).
• At this point, in the upper left corner of the screen, OSD
display of CH : 16, VAL : 80 HEX will appear. (Refer to Re-
mote Controller Operating Method 2.)
• Then, the following adjustment should be conducted. (Re-
fer to Remote Controller Operating Method 3 to 5.)
• After adjusting for each item, press PLAY/PAUSE key to
confirm on the selection. (Refer to Remote Controller Oper-
ating Method 4.)
Adjustment Value
K : 15.734±50Hz
E,M : 15.625±50Hz
3.2V±0.05V
3.0V±0.05V
7F
7F
2.45V±0.05V
1.1V±0.05V
3.4V±0.05V
0.1V±0.05V
0.1V±0.05V
Condition
Input signal
: None
Input signal
: 10 step (NTSC)
1Vpp V/S ratio
: 7 : 3 (75Ω at
terminal)
X34 AVIN input
Oscilloscope range
: 500mV/DIV AC