Focus Adjustment; Convergence Adjustment - Sony TRINIT PVM-20M7MDE Service Manual

4-4. Focus Adjustment
1. Receive the 625 monoscope signal.
2. Adjust the H. FOCUS (FOCUS I of FBT) until the vertical
lines have the optimum (just) focus.
3. Adjust the V. FOCUS (FOCUS 2 of FBT) until the horizontal
lineshavetheoptimum(just)focus.
4.
Repeat
adjustment of steps 2 and 3
to
obtain tracking of them
until the entire screen has the optimum focus as an average.
FOCUS1
FOCUS2
SCREEN
4-5. Convergence Adjustment
L Receive the PAL dot signal
Set the CONTRAST to good viewing setting.
Set the BRIGHTNESS lo MIN.
2. Align the markings on the 6-pole magnels of the CRT neck
assembly.
3. Perform the rough convergence adjustment in the horizontal
direction using
the H. STA
(C board).
Cboard
RV801
H.STA
-27-
PVM•20M7MDE
4.
Perform
the rough convergence adjustment
jn
the vertical
direction using
the
V. STA (P board).
Pboard
RV901
V.STA
5.
Perfonn the manual degauss.
6. Receive the PAL cross-hatch signal.
7. Adjust the H. STA and the V. STA to show the three parallel
linesofR.G.Bintentionally.
H. STA · • • • • •
on
the C board {RV801)
V. STA • • · · • · on the P board (RV901)
8. Adjust the 6-pole magnets on the neck assembly so that the
distance between R-0 and between B-G becomes equal in both
horizontalandverticaldirections.
Perfonn the
static
convergence correction by adjusting the
two levers: angle
Qi
between A and B, and tiltQ2. (When
QI==
0,amount of correction =0.)
9.
Adjust
the
H. STA and V. STA until the convergence error at
thecenterofdisplaybecomeszero.
10.AdjustTLV.