Adjustment Item - Kenwood DDX6027 Service Manual

Adjustment item

1. Chroma IC adjustment (X14)
(A remote controller is used for adjustment, while confirm-
ing on the waveform with an oscilloscope.)
2. PLL_CLK/OSD_HSYNC phase adjustment (X14)
(A variable resistor is used for adjustment while confirming
on the waveform with an oscilloscope.)
3. Freerun adjustment (X35)
(A variable resistor is used for adjustment while confirming
on the waveform with an oscilloscope.)
4. Flicker adjustment
(A remote controller is used for adjustment, while confirm-
ing on the waveform with an oscilloscope.)
5. Screen position adjustment
(A touch panel is used for adjustment, while confirming the
screen.)
6. Touch Panel Adjustment
(A touch panel is used for adjustment.)
Test Mode
Adjustment Item
Display
A Chroma VCO CH : 16
Adjustment
F Y GCA CH : 2
(Brightness Gain)
Adjustment
B Brightness CH : 6
Adjustment
C Contrast CH : 13
Adjustment
D Black Limiter CH : 5
Adjustment
E White Limiter CH : 10
Adjustment
ADJUSTMENT
Adjustment Method
Connect TP: HD between R249 and R250 and TP: VD
between R248 and R251 to GND. Measure TP: TC_HD of
IC237 32 pin with a frequency counter.
Monitor waveform of 59 pin TP: VG of CN905 with an
oscilloscope and adjust the oscillation width of forward
rotation-side pedestal and forward rotation-side Step 10.
Monitor waveform of 59 pin TP: VG of CN905 with an
oscilloscope and adjust the oscillation width of forward
rotation-side Step 1 and reverse rotation-side Step 1.
Monitor TP: VG waveform of 59 pin of CN905 with an
oscilloscope and adjust the oscillation with of forward
rotation-side Step 8 and reverse rotation-side Step 8.
Maintain and confirm 7F and move on to the next step.
Monitor waveform of 59 pin TP: VG of CN905 with an
oscilloscope and adjust the oscillation width of forward
rotation-side Step 9 and reverse rotation-side Step 9.
DDX6027/6027Y/7017
DDX7037/7047/7067
1. Chroma IC Adjustment Procedure (X14)
1. While pressing on the [ATT] + [SRC] keys on the unit, reset
to enter the Test Mode.
2. Press [DIRECT] key on the TV remote controller to get into
the Chroma IC Adjustment mode.
→ At this point "CH : 16 VCO_FREERUN VAL 80" is dis-
played on upper left corner. (VAL value is displayed in HEX.)
3. Perform adjustments in Tables A~M in the order of a~c, one
by one.
a. Use [8] and [0] of 10Key to change the setting value. →
The values in the VAL on the upper left corner of screen.
b. Press [PLAY/PAUSE] key to confirm the setting values.
→ When confirmed, the color of "CH : 16 VCO_FREERUN
VAL 80" changes.
Press [PLAY/PAUSE] key once more to release.
c. Use [7] and [9] of 10Key to move to the next setting. →
The CH value in the upper left corner of screen changes.
4. Press [DIRECT] key to write data to E2PROM.
5. Press [DIRECT] key again to move out of Chroma Adjust-
ment mode.
∗ Conduct this in AUDIO mode using TV/NAVI remote con-
troller.
Adjustment Value
(Temporary)
NTSC type
15.734±50Hz
PAL type
15.625±50Hz
2.6V±0.05V
3.2V±0.05V
3.0V±0.05V
7F
3.2V±0.05V
If lower than 3.2V,
finalize with 7F.
(However, 2.7V
or less is NG.)
Condition
Input signal
: None
Input signal
: 10 STEP (NTSC)
1Vpp V/S ratio
: 7:3 (75Ω terminated)
X34 AVIN input
Oscilloscope range
: 500mV/DIV
AC
35