Panasonic AJ-D455P, Service Manual

Page: 411 / 743

ELE-20
5-2. PL DC Adjustment
BOARD V IN (F5)
TP
TP552 (PLL DC)
ADJ. VC500 (VCO DC)
TAPE -----
INPUT Analog Component Signal
(100% Color Bar with 7.5% Set-Up)
MODE
EE
M. EQ Oscilloscope
SPEC. DC voltage : 0
±
0.1V
1. Connect the scope to TP552. And adjust VC500
so that the DC voltage is in the specification.
5-3. Composite Color
Demodulation Timing
Adjustment
BOARD V IN (F5)
TP
TP400, TP401
ADJ. VR401 (RSTH SITE), Service Menu
TAPE -----
INPUT Analog Composite Signal
(100% Color Bar with 7.5% Set-Up)
MODE
EE
M. EQ Oscilloscope
SPEC. Center
1. Open the SERVICE MENU. (Refer to SEC1
Service Information.)
2. Select the E00: V IN ADJUST and press the
“SET” button to open the V IN ADJUST MENU.
3. Select E-2 CMPST ADJUST and press the “SET”
button to open the CMPST ADJUST menu.
4. Set the numerical value of the E08 SITE CAXIS
to 127.
5. Connect the scope CH1 to TP401 and CH2 to
TP400.
6. Adjust VR401 so that the timing of the center
portion of these pulses becomes same timing.
7. Set the E08 SITE CAXIS to –27.
8. Close the menu.
<Note>
After this adjustment, 5-*Composite Vector Adjustment
should be performed.
5-4. Composite SCH Detection
Adjustment
BOARD V IN (F5)
TP
TP980 (INCF), TP930 (SCHP)
ADJ. VR402 (SCH SITE)
TAPE -----
INPUT CF Signal
Analog Composite Signal
(100% Color Bar with 7.5% Set-Up)
MODE
EE
M. EQ Oscilloscope
SPEC. T: 55
±
5nsec
1. Connect the scope CH1 to TP980 and CH2 to CF
Pulse of the signal generator. And set the trigger
channel to CH2. (Triggered by rising edge.)
2. Set VR402 fully counterclockwise.
3. If income CF0 pulse of the TP980 is positive
pulse, turn the VR402 clockwise until changing
from positive to negative as shown bellow.
4. Turn the VR402 clockwise slowly until just
changing from negative to positive as shown
below.
5. Connect the scope CH1 to TP930.
6. Turn the VR402 clockwise slowly until the rising
edge of the SCHP pulse (TP930) moves from “A”
to “B” as shown below. The time difference “T”
should be in the specification.
TP401 (5Vpp)
TP400 (50mVpp)
Center
Trigger
CF Pulse of
Signal Generator
TP980
INCOME CF0
(Positive)
TP980
INCOME CF0
(Negative)
Trigger
(Rising edge)
TP930
SCHP pulse
T
Trigger (Falling edge)
A B