Deflection System Adjustment; Adjusting The Horizontal Oscillation Frequency; H-Blk Adjustment; Picture Phase Adjustment - Sony trinitron PVM-1450QM Service Manual

j
II.
Deflection System Adjustment
I
1. ADJUSTING THE HORIZONTAL OSCILLATION
FREQUENCY
1. Input a 525 monoscope signal.
2. Set:
CONT, ..... 80%
BRT ......... 50%
3. Put the unit into service mode.
4. Drop A board IC507 Pin 1 to ground with a 100µ/16V
electrolytic capacitor. (Ground must use CNSOS Pin 3.)
Or plug the H-FREQ tool into CNSOS.
5. Adjust
j
60H-FREQ
I
so that the diagonal lines on the screen
become vertical lines. (Fig. 1)
6. Input a 625 monoscope signal.
7. Adjust jSOH-FREQj so that the diagonal lines on the screen
become vertical lines. (Fig. 1)
+
100 µ,/16V
~
Fo: Low
2-1. H-BLK Adjustment
H-FREQtool
Fo :Optimum
Fig. 1
I. Input a 525 monoscope signal.
2. Set:
CONT ...... 3Q%
BRr ......... so%
3. Put the unit into service mode.
Fo: High
4. Observe the anode of D516 or TP300 with the oscilloscope
and adjust
j
H-BLK
I
to obtain the waveform in Fig. 2.
,v
1
·1 · ..................... -1 ..._____·
,m. '"'
Fig. 2
2-2. H-BLK Adjustment (PVM-1450QM only)
1. Put the unit into service mode.
2. Input an adjustment value of 70 for H-BLK.
3-1. PICTURE PHASE Adjustment (PVM-1454QM only)
1. Input a 525 monoscope signal.
2. Put the unit into under scan mode.
3. Set:
CONT ...... Min.
BRr ......... Max.
PVM-1450QM/1454QM
4. Put the unit into service mode.
5. Use
I
U/S H SIZE
I
to adjust the size of the monoscope white
frame to be about 1 cm to the inside of the limits of the
effective screen.
6. Turn RVSO! (H-CENT) and adjust so that B=B'.
7. Adjust/60 VIDEO PHASE)so that the signal region comes to
the center (A=A ') of the deflection region. (Fig. 3)
Deflection region
Signal region
Effective screen
A=A'
Fig. 3 B=B'
8. Input a 625 monoscope signal.
9. Adjust/so VIDEO PHASE)in the same manner.
3-2. PICTURE PHASE Adjustment (PVM-1450QM only)
I. Input a 525 monoscope signal.
2. Put the unit into service mode.
3. Input an adjustment value of 123 forj 60 VIDEO PHASE!.
4. Input an adjustment value of 137 forjso VIDEO PHASE!.
5. Roughly adjust H-SIZE so that the horizontal size is 15.75
frames.
6. Turn RVSOI (H-CENT) and adjust so that the left and right
over scan amounts are eciual.
4-1. V•BLK Adjustment (PVM-1454OM only)
I. [nput a 525 monoscope signal.
2. Put the unit into under scan mode.
3. Set:
CONT ...... Min.
BRr ......... Max.
4. Put the unit into service mode.
5. Adjust!V BLK (60)
I
so that before 0.SH of the white frame
on the top of the monoscope is barely unblocked.
6. End under scan mode and put the unit into Normal 16:9
mode.
7. Adjust~, 1-6-: 9-BL-K-ST_A_R_T_(-60-,)!andj 16: 9 BLK END (60)!
so that the vertical direction frame count is 11. 75 for the light
emitting section of the screen and at the same time the top
and bottom block amounts are the same,
Note : This must be done before the 16 : 9 V-SIZE
adjustment.
8. Input a 625 monoscope signal.
9. Adjust
IV
BLK (50)
l
in the same manner as in 5 above.
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