Sony BVP-550, Maintenance Manual

Page: 531 / 924

4-41 (E)
BVP-550
4-3-17. Pre Knee Adjustment
Equipment : Oscilloscope, Waveform monitor
Preparation:
• Extend VA-163 board with EX-464 board.
Iris of the lens : CLOSE
Adjustment Procedures:
1. Set the DISP switch (on the side panel) to MENU
while holding down the MENU SEL switch (on the
front panel).
2. Set the menu as follows.
MENU : Paint
PAGE : Knee/W.Clip (P6)
ITEM : Knee
→
On
3. Set the RGB/ENC switch (on the side panel) to ENC.
4. Set the GAIN switch (on the side panel) to M (9 dB).
5. Set the WHITE BAL switch (on the side panel) to
PRST.
6. Set the menu as follows.
MENU : System config
PAGE : Pre Knee/Zebra (S4)
ITEM : Test
→
2
7. Set the menu as follows, and adjust the pre knee 1 for
G by using the MENU SEL switch.
Test Point
: TP52 (GND:GND (A))/
Extension board (extending VA-163)
Adjustment Point:
MENU : System config
PAGE : Pre Knee/Zebra (S4)
ITEM : PreKnee1[G]
Specifications
: A = 1.68
±
0.02 V p-p
(Oscilloscope)
5. Confirm that the level at portion B does not fluctuate
even if the flare turns On/Off. If fluctuates, turn Flare
ON and adjust by Flare (G).
Menu Setting:
MENU : Paint
PAGE : Video Level (P1)
ITEM : Flare
→
On/Off
Adjustment Point:
ITEM : Flare [G]
6. Set the ENC/RGB switch (on the side panel) to ENC.
7. Set the menu as follows, and adjust the flare for R by
using the MENU SEL switch.
MENU : Paint
PAGE : Video Level (P1)
ITEM : Flare [R]
Specifications
: Minimize the carrier leakage.
8. Set the menu as follows, and adjust the flare for B by
using the MENU SEL switch.
MENU : Paint
PAGE : Video Level (P1)
ITEM : Flare [B]
Specifications : Minimize the carrier leakage.
(Waveform Monitor)
9. Repeat the steps 7 and 8 alternately, until the carrier
leakage is minimized.
File Store:
Execute the file store. Press the MENU SEL switch to
execute.
MENU : Reference File
PAGE : Reference File (R1)
ITEM : File Store
Resetting after Adjustment:
• WHITE BAL switch (on the side panel)
→
PRST
4-3. Overall Electrical Alignment
4-3-16. Flare Adjustment
4-3-17. Pre Knee Adjustment