Sony BVP-570, Maintenance Manual

Page: 804 / 806

2-8 (E)
BVP-570/550/500
(Waveform monitor)
OK NG
NG (VBS OUT)
(Monitor screen)
Halogen
lamp
(Monitor screen)
Vertical
overflow
3. Connect an oscilloscope to each test point (TP) on the
VA-163 extension board. Make sure that the video
level of each channel is within the specification 1. If
not, perform adjustment of error channel as follows:
(1) Decrease the value of “V reg” on page “Board
Config” in the direction of minus within the limit
of
_
30 hex.
(2) Increase the value of “V sub” until the video level
meets the specification 1.
n
If it is impossible to meet the specification 1, make
sure that the specification 2 is met. If not, perform
adjustment in accordance with the above procedures.
Chan- Test Point/ Adjustment Specifications
nel GND Point
(Extension (Menu)
Board)
G-ch Pins 74/73 V reg [G] Specification 1:
V sub [G] A = 750 mVp-p or more
R-ch Pins 72/71 V reg [R] Specification 2:
V sub [R] A = 580 mVp-p or more
R-ch Pins 72/71 V reg [B]
V sub [B]
(Oscilloscope)
4. Connect the color monitor to MONITOR OUT
connector.
5. S650 (MONITOR OUT)/IF-538 panel
→
VF
G button/on the rear panel
→
ON
R/B button/on the rear panel
→
OFF
6. Shoot a highlight object (halogen lamp, etc.), and
check to see that there is no vertical overflow under-
neath the light object on the monitor screen. If the
vertical overflow is visibly shown on the monitor
screen, go back to step 3, then readjust V sub [G] until
the specification 2 is met.
7. R button/on the rear panel
→
ON
G/B button/on the rear panel
→
OFF
8. Make sure that there is no vertical overflow in the Red
channel (R-ch). If the vertical overflow is visibly
shown, go back to step 3, then readjust V sub [R] until
the specification 2 is met.
File Store :
When the factory adjusted V sub value has been changed,
be sure to execute the OHB file store.
Set the menu follows.
MENU : Trimming File
PAGE : OHB File (T2)
ITEM : File Store
(Press MENU SEL switch to execute the file store.)
2-2. Upgraded BVP-500/500P with BKP-5090
2-2-2. V Substrate Voltage/V Reset Gate Adjustment
V rate
A