Sony trinitron PVM-1450QM Service Manual page 36

PVM-1450QM/1454QM
3. NT358 B-Y PHASE
The phase adjustment must be carried out before the chroma
adjustment.
1) Input an NTSC color bar.
(Input only the R-Y component. Have B-Y and Y off.)
2) Connect the oscilloscope probe to TP305.
3) Put the unit into service mode.
4) Adjust IB-Y PHASE NTSC 358 lso that the color components
form a straight line.
4. NT358 CHROMA (NORMAL)
I) Input an NTSC color bar.
2) Connect the oscilloscope probe to IC404 Pin 30 or TP402.
3) Put the unit into service mode.
4) Using I CHROMA NTSC 358 NOR I, adjust so that the tops of
the waveform line up as in the diagram below. (Fig. 16)
IC404 30 pin
············································ ........................ l ... .
10mVmax.
Fig. 16
Adjust so that the levels of the first peak and the fourth peak are
the same.
5. NT 358 CHROMA (ACC OFF) (PYM-1454QM only)
I) Switch ACC Off with the menu.
2) Adjust !CHROMA NTSC 358 ACC OFF! in the same
manner as 8.-4 above. (Fig. 16)
6. NTSC 358 R-Y LEVEL
I) Input an NTSC358 color bar.
2) Connect the oscilloscope probe to IC404 Pin 41 or TP401.
3) Put the unit into service mode.
4) Using I R-Y LEVEL NTSC 358
I,
adjust so that the tops of the
waveform line up as in the diagram below. (Fig. 17)
IC404 41 pin
D
Fig. 17
J ...
l
20mV max.
Adjust so that B=D above (20
mV
max.) Check that the
difference between B and C is no greater than 60 m V.
7. NTSC 443 PHASE (NORMAL)
*
The adjustment in 8-7-3) is not necessaiy for PVM-l454QM.
*
The adjustment in 8-7-4) is not necessaiy for PYM- 1450QM.
1) Input an NTSC 443 color bar.
2) Connect the oscilloscope probe to TP306.
3) Supply 4 VDC to IC305 Pin 4.
4) Put the unit into
HN
delay mode.
5) Put the unit into service mode.
6) Adjust
I
PHASE NTSC 443 NOR
I
so that the output
waveform burst section is a straight line. (Fig. 18)
Make this flat.
Fig. 18
8. Nl:SC 443 PHASE (ACC OFF) (PYM-l454QM only)
I) Switch ACC Off with the menu.
2) Adjust
j
PHASE NTSC 443 ACC OFF
I
in the same manner as
in 7-5). above. (Fig. 20)
9. NTSC 443 B-Y PHASE (PYM-1454QM only)
NTSC 443 CHROMA NOR
1) Input an NTSC 443 color bar.
2) Connect the oscilloscope probe to TP402.
3) Put the unit into service mode.
4) Adjust !B-Y PHASE NTSC 443
j
andiCHROMA NTSC 443
NOR
I
so that the tracking is normal and the tops of the
waveform line up. (Fig. 19)
Line up A and D with CHROMA. A-D 20
mV
max .
........
~
..... J ..
A
B
\
C
I
D ..
r
1
r·
B-C20mV
max.
Line up B and C with PHASE.
Fig. 19
10. NTSC 443 CHROMA (ACC OFF) (PYM- l 454QM only)
I) Switch ACC Off with the menu.
2) Adjust I CHROMA NTSC 443 ACC OFF
I
in the same manner
as 9-4). (Fig. 22)
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