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Blue-only White Balance Adjustment; Sub Brt Adjustment; Focus Adjustment - Sony PVM-20M2U Service Manual

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3-11. Blue-only white balance adjustment
1.
Tum ON the blue-only of the user controller SW. (To set blue-
only.)
2. Input all-white (COMPOSITE signal without burst).
The all-white signal luminance shall be 100 IRE.
CONT: 80%
.
BRT: 50%
3. Select COL TEMP/BAL.
4. Select 6500K.
5. Adjust to the standard values with
I
ern
6500K B/O<RED>I
and
lcrn 6500K B/O<GREEN>l
or
lctr2 6500K B/O<RED>l
and
lCffl 6500K B/O<GREEN>l •
6. Select COL TEMP/BAL.
7. Select 9300K.
8. Adjust to the standard values with
lctr2 9300K B/O<RED>l
and
lcrf2 9300K B/O<GREEN>l
or
!ern 9300K B/O<RED>
I
and
lC!fl 9300K B/O<GREEN>l .
9. Adjust the all-white signal luminance, and check that the white
balance is satisfactory when the luminance of the screen is SNIT.
3-12.SUB BRT adjustment
l. Input a 525 monoscope signal.
2. CONT ... MIN
BRT .... CENTER (50&)
3. Select lsus
BRIGHT!
in the service mode.
4. Adjust
lsUB BRIGHT!
so that 10 IRE glows slightly and 0 IRE is
cut off.
3-13.Focus adjustment
1. PVM-20M4 Series
l. Adjust the H focus (upper side of focus pack) by means of a dot
signal.
2. Adjust the V focus (lower side of focus pack) by means of a dot
signal.
3. Tum the H focus fully clockwise when viewed from the front by
means of a dot signal.
4. Tum the H focus counterclockwise and focus well the dot in the
center of the screen. When the dot is well focused, it will be
divided into two sections.
5. Tum the H focus VR clockwise (returning direction) so that the
dot will be as shown in Fig.3-30. At that time, both ends of the
central section of the screen are in the same state.
Dot~
\::7
8
Correct focus
Connected dot
Fig. 3-30
6. Check that the resolution is more than 800 lines by means of a
digital monoscope signal.
7. Check that the magenta ring is unconspicuous by means of an
all-white signal.
Fig.3-31 Movement of VR when viewed from the front
2. PVM-14M4 Series
l. Adjust the H focus (upper side of focus pack) by means of a dot
signal.
2. Adjust the V focus (lower side of focus pack) by means of a dot
signal.
3. Tum the H focus fully clockwise when viewed from the front by
means of a dot signal.
4. Tum the H focus counterclockwise and focus the dot in the cen-
ter of the screen well. The dot signal is divided into two sections
at that time.
5. Tum the H focus VR counterclockwise so that the dost will be as
shown in Fig.3-32. At that time, both ends of the central section
of the screen are in the same state.
Dot~
\::7
8
Correct focus
Connected dot
Fig. 3-32
6. Check that the resolution is more than 800 lines by means of a
digital monoscope signal.
7. Check that the magenta ring is unconspicuous by means of an
all-white signal.
3
h
Fig.3-33 Movement of VR when viewed from the front
3. PVM-14M2 Series (CRT14MG)
Make adjustment so that the dots in the central section (right and
left edges) will be undivided, respectively. (When well-focused,
the dot is divided into two sections.)
Correct focus
The center is separated
Slightly shift the focus this time.
0
8
4. PVM-20M2 Series
0 . . . . . . _
Make adjustment so
that the center of the
dots on both sides are
not separated.
0
Fig. 3-34
Focus the character "30" in the center of monoscope well
a-5
usualy.
-24-

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