Panasonic BT-M1950Y Service Manual page 35

Item
Comb filter
(NTSC)
Notch filter
Color sync
(NTSC)
Test equipment Test points
Oscilloscope TP-64A
Signal generator TP-648
(Color bar)
Oscilloscope
Signal generator
(Color bar
NTSC/PAL)
Signal generator
(Color bar)
10 KQ resistor
Shorting fixture
TP-65
Adjustment
locations
R107 (COMB1
LEVEL)
T102 (COMB1
PHASE)
R117(COMB2
LEVEL)
R120(COMB2
PHASE)
[Signal PWB]
C117
(NTSC NOTCH)
C122
(PAL NOTCH)
[Signal PWB]
C222(3.58APC)
[Signal PWB]
-35-
D 1-1v1 l~OUT
Adjustment procedure
1. Set the menu Filter Select to Comb.
2. Connect oscilloscope to TP-64A.
3. Alternately adjust R107 and T102 to minimize
the chroma component.
I I
I
I I
Minimize chroma component
4. Connect oscilloscope to TP-64.
5. Alternately adjust R 117 and R 120 to minimize
the chroma component.
1. Set the menu Filter Select to Notch.
2. Connect oscilloscope to TP-65.
3. Adjust C 117 to minimize the chroma component.
4. Supply a PAL color bar input.
5. Adjust C1 22 to minimize the chroma component.
1. Connect a 1
o
KQ resistor between IC201 pin 13
and + B (12 V).
2. Connect a shorting fixture between IC201 pin
14
and ground.
3. Adjust to synchronize the color bar with C222.
4. Remove the resistor and shorting fixture.
5. Change the input signal, then return the color
bar. Confirm absence of sync disturbance.