Panasonic AJ-D455P, Service Manual

Page: 420 / 743

ELE-29
5-21.Composite Pb/Pr Signal
Timing Adjustment
BOARD
V IN (F5)
TP
Y, Pr, Pb OUT
ADJ. Service Menu
TAPE -----
INPUT
Analog Composite Signal
(Pulse and Bar with 12.5T modulation
Signal)
MODE EE
M. EQ Analog WFM (DIFF mode)
SPEC. T = 0± 5nsec
1. Confirm that the 12.5T modulation signal portion
of Component Y OUT is displayed correctly on
the WFM as shown in figure.
2. Confirm that the 12.5T modulation signal portion
of Component PB and PR OUT is displayed
correctly on the WFM as shown in figure.
3. Set WFM monitor to DIFF mode. In the DIFF
mode, waveform of Y and PB or PR signals are
integrated as shown in figure.
4. Expand the 12.5 pulse portion (an ellipse dotted
portion as indicated in figure) and set the cursor
to 0 cross point as shown in figure.
5. Open the SERVICE MENU (Refer to SEC1
Service Information.)
6. Select the E00: V IN ADJUST and press the
“SET” button to open the V IN ADJUST MENU.
7. Select E-2 CMPST ADJUST and press the “SET”
button to open the CMPST ADJUST menu.
8. Adjust the E04 SITE PB TMG or E07 SITE PR
TMG so that the signal timing between Y and PB
or PR signal is in specification.
9. Close the Menu.
NOTE:
Please use WFM Monitor with DIFF mode.
Set DIFF mode
on WFM Monitor
COMPONENT
Y OUT
12.5T Pulse
COMPONENT
PB or PR OUT
DIFF mode
0 CROSS POINT
CURSOR
Expand the
12.5 Pulse portion
T=0
±
5nsec
T
COMPONENT
Y OUT
COMPONENT
PB or PR OUT
COMPONENT
Y OUT
(12.5T Pulse portion)
COMPONENT
PB or PR OUT
(12.5T Pulse portion)