V-Sub Voltage Adjustment - Sony BVP-E30 Maintenance Manual

5-8. V-SUB Voltage Adjustment

n
The V-SUB voltage specific to the CCD has been adjusted
for the optimum value at factory.
Therefore, never change this voltage from the factory
setting value.
Only when the improper data was saved by OHB TRIM-
MING page of the SERVICE menu by mistake, perform
this adjustment.
Equipment : Oscilloscope
Preparations
. Extend the CCD block. (Refer to Section 1-14-3.)
. Shoot the fully occupied white area of the pattern box in
the full underscanned monitor frame adjusting the zoom
control.
Adjustment Procedures
1. V-SUB [R] adjustment
(1) Test Point : IC1- pin14/PA-274 board
(GND : E501/DPR-261)
A = 500 ± 50 mV
Lens Iris :
(2) Select a large lens aperture (3 stops and a half) to
obtain the 10 times amount of light.
(3) Adjustment Point
. MENU : SERVICE
. PAGE :
OHB TRIMMING
. ITEM :
V-SUB [R]
Specifications : NTSC : A = 1400
PAL :
H rate
(Oscilloscope)
2. Perform V-SUB [G] adjustment in the same manner as
step 1.
Test Point : IC1- pin14/PA-273 board
(GND : E501/DPR-261)
Adjustment Point
. ITEM :
V-SUB [G]
BVP-E30/E30P M-V1
+100
mV
_0
+100
A = 1100 mV
_0
A
3. Perform V-SUB [B] adjustment in the same manner as
step 1.
Test Point : IC1- pin14/PA-272 board
(GND : E501/DPR-261)
Adjustment Point
. ITEM :
V-SUB [B]
4. Store the TRIMMING data.
(Press the MENU SELECT knob to execute.)
ITEM : STORE
Setting after Adjustment
Restore the CCD block to the original position.
2
B
A
PA-272/273/274 board (A side)
A
E1 TP1
B
C
D
E
F
G
H
J
E2
K
L
M
11 10
9 8 7
DPR-261 board (A side)
1
IC1
13
14pin
E501
TP501
TP502
TP503
TP800
6 5 4 3 2 1
5-17 (E)