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Adjustment; White Balance Adjustment - Sony PVM-20M2U Service Manual

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Note : When adjustment is insufficient, use pennalloy for perfect
adjustment.
1. Group of models 4 (See Table 3-3.)
l.
Input a cross-hatch signal.
2. Make adjustment with the TLV, YCH, YBH VR, and XCV coils
of the deflection yoke to minimize nonconvergence.
3. When the nonconvergence of the TILT component is included in
the horizontal convergence, make adjustment with the TLH com-
pensator. (Fig.3-28)
2. Groups of models 1, 2, and 3 (See Table 3-3.)
I. Input a cross-hatch signal.
2. Make adjustment with the TLV, YCH VR, and XCV coils of the
deflection yoke to minimize nonconvergence.
3. When the nonconvergence of the TILT component is included
inthe horizontal convergence, insert the TLH compensator into
the deflection yoke for adjustment. (Fig.3-28)
3. Group of models 5
(See
Table 3-3.)
I. Input a cross-hatch signal.
2. Make adjustment with the XCV coil of the deflection yoke to
minimize nonconvergence.
3. When the nonconvergence ofthe TILT component is included in
the vertical convergence, insert the TLV compensator into the
deflection yoke for adjustment. (Fig.3-28)
3·9. G2 adjustment
l. Input a 525 monoscope signal.
2. Connect the probe of the oscilloscope to TP403 on the A board.
3. Measure the lowest reference pulse of the three.
4. Make adjustment with SCREEN VR so that the left end of the
wavefonn will be 1.35 V±0.05 V.
1.35V
(V synchronization)
----------------~----GND
The waveform is a rectangle
as shown
on
the left.
____ Adjust the left corner so that
it will be 1.35V.
Fig. 3·29
3·10. White balance adjustment
1. Input a 525 monoscope signal. (Input from LINE A or B with no
burst.)
2. Set as follows:
CONT:O%
BRT: 50%
3. Adjust !SUB-BRIGHT! in the service mode so that the 20-tone gray
scale will be as follows:
0 and
5
IRE
-+
Cut off
10 IRE
-+
Slight glow
4. Input 525 all-white (COMPOSITE signal without burst).
5. Set CONT VR to 80%.
6. Adjust the all-white luminance so that the screen luminance will
be 3 NIT.
7. Press MENU and select COL TEMP/BAL.
8. Select 6500K.
Set "' l 3""2oo=K""' s w""l to ''0" for both 9300K and 6500K.
9. Put the unit into the service mode.
10. Adjust to the standard values with <RED> and <BLUE> of
lcrn 6500K BIASI or lcm 6500K BIASI .
Set cut-off to 3 NIT.
<GREEN>
Group of models (Table 3-3)
Fix as follows:
2,3,5
"400"
1, 4
"512"
11. Switch the all-white signal luminance to 100 IRE.
12. Adjust to the standard values with <RED> and <BLUE> of
lcrn 6500K GAINI or !ern 6500K GAiNJ .
<Green>
Set it to
:ZOO.:
13. Repeat adjustment (10, 11, and 12) until the adjustment is com-
plete, and then write the adjustment data.
14. Press MENU and select COL TEMP/BAL.
15. Select 9300K.
16. AdjustiCit2
r.:=_""'9300=K~BI,.A"'sllcm
9300K GAiNI or lcrrt 9300K BIASI
lcm
9300K GAIN! in the same manner as adjustme~ts 1013.
BIAS <GREEN>
Group of models (Table 3-3)
2, 3, 5
1, 4
GAIN <GREEN>
Fix it at
:ZOO.:
Fix as follows:
"4()0"
"512~'
-23-

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