Panasonic BT-M2090Y Service Manual page 36

Item
APC (PAL)
Pulse cross
Chroma and
phase
(Video input,
NTSC)
Test equipment Test points
Oscilloscope TP-48
Signal generator TP-49
(Color bar, split
color bar)
10 KQ resistor
5.6KQ resistor
Shorting fixture
Signal generator
(Color bar
NTSC/PAL)
Oscilloscope
Signal generator
(Color bar)
TP-B
(CRT socket
PWB)
Adjustment
locations
C224( 4.43APC)
R210(DL AMP)
C206(LISSAJOUS
3)
C207(LISSAJOUS
2)
C209
[Signal PWBJ
R570(V.SYNC)
(Signal PWBJ
S02(CHROMA)
S03(PHASE)
[SERVICE MENU)
-36-
Adjustment procedure
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. Connect a 5.6KO resistor between IC201 pin 8
and ground.
4. Adjust to synchronize the color bar with C224.
5. Remove the resistor and shorting fixture.
6. Connect an oscilloscope to TP-48 and TP-49
and display X-Y coordinates.
7. Adjust R210 and C206 to obtain the waveform
indicated in the figure. If inadequate, adjust
C207 and C209.
(A)
(B)
8. Supply a PAL split color bar input and adjust
C224 to minimize coloration in the R-Y and 8-Y
components.
1 .
Set the pulse cross switch to on.
2. Adjust R570 to eliminate luminance and burst
signal variation in the V blanking period.
3. Supply a PAL color bar input.
4. Confirm absence of luminance and burst signal
variation in the V blanking period.
5. Again supply an NTSC color bar input and again
confirm absence of luminance and burst signal
variation in the V blanking period.
6. If variation is present, again adjust R570.
7. Set the pulse cross switch to off.
1. Supply an NTSC color bar to Video A.
2. Set the menu Filter Select to Notch.
3. Connect oscilloscope to TP-8.
4. Alternately adjust S02 and S03 lo obtain a
straight line waveform.
5. Set Filter Select to Comb.
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