Sony PVM-20M2U Service Manual page 28

4. Connect the IC507
<D
PIN on the A board to GND via the 1001Jf
16V chemical capacitor. (Use CN505@ PIN for GND.) Or in-
sert the H-FREQ jig into CN505.
100p/16V
Rg.S-1 H-FREQ jig
5. Adjust
160 H-FREQI
so that the slanting lines on the screen will be
vertical. (Fig.5-2)
6. Input a 625 monoscope signal.
7. Adjust
ISO H-FREQI
so that the slanting lines on the screen will be
vertical. (Fig.5-2)
Fo:Low Fo:Optimal Fo:High
Fig.5-2
2. H BLANKING adjustment
1. Input a 525 monoscope signal.
2.
CONT ... 80%
BRT .... 50%
3. Set the unit in the service mode.
4. Observe the anode of TP300 or D516 with an oscilloscope, and
adjust IH-BLANKINGI so that the waveform will be as shown in
Fig.5-3.
-.--_... .. 1---- ------------------------
-+----
6V
9.3±0.1 pS
Fig. 5-3
3. Picture phase adjustment
1. Input a 525 monoscope signal.
2. Set the unit in the UNDER SCAN mode.
3. CONT ... Min.
BRT ....
Max.
4. Set the unit in the service mode.
5. Adjust
IUIN H-SJZBI
so that the white frame of the monoscope will
be approx. 1 em to the inside of the effective screen.
6. Tum RV50l (H-CENT) so that B = B'.
7. Adjust
160 VIDEO PHASE I so
that the signal area will be in the cen-
ter (A= A') of the deflection area. (Fig.5-4)
8. Input a 625 monoscope signal.
9. Adjust
lsoVIDEOPHASEI
in the same manner.
Deflection area
Signal area
' '
Effective screen
Fig.5-4
4. V BLANKING adjustment
l. Input a 525 monoscope signal.
2. Set the unit in the UNDER SCAN mode.
3. CONT ... Min.
BRT ... Max.
4. Set the unit in the service mode.
' '
A= A'
B=B'
A'
B'
---
5. Adjust
IV-BLANKING<60>1
so that the white frame in the upper
section of the monoscope will be about to be blanked.
Note: Blanking up to the point 1H away from the white frame is
permissible, but the adjusting center should be up to the
point 0.5H away from the frame.
6. Cancel the UNDER SCAN mode, and set the unit in the normal
16:9 mode.
7. Adjust
lr.-t6;;:;:9"' B ' " LANKIN,.....=:uo"' s ""-r.":AKr=-<60>::;;;:-,l
and
lt6:9 BLANKING BND<60>
ilo
that the number of frames in the vertical direction in the lumi-
nous section of the screen will be 11.74 and the BLK quantity at
the top and bottom will be the same.
Note : Make adjustment before 16:9 V-SIZE adjustment.
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