66 Mhz/54 Mhz Origin Oscillation Adjustment; Video System Adjustments - Sony BRC-300 Service Manual
3ccd color video camera / optical multiplex unit
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- Command list (23 pages) ,
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3-2. BRC-300/300P Camera Block Electrical Alignment
3-2-8. 66 MHz/54 MHz Origin Oscillation
Adjustment
Set the frequency of the clock for synchronization.
If the following specified value is not satisfied, the syn-
chronization will be disrupted and the color will become
inconsistent.
Subject
Arbitrary
Measurement point
VC-343 board, pin 6 of IC503
Measuring instrument
Frequency counter (through the
oscilloscope)
Adjustment page
F
Adjustment address
10
f = 33000000 ± 165 Hz (NTSC)
Specification
f = 27000000 ± 135 Hz (PAL)
m
. The data of page: 0, address: 10 must be “00”.
. Connect the equipments as shown in the figure.
. Terminate the probe of the oscilloscope with 75 Z.
Probe
75 Z terminator
Oscilloscope
Frequency counter
Adjusting procedure
Order Page Address Data Procedure
1
0
01
01
Set the data.
2
F
10
Change the data to satisfy the
specification f.
3
F
10
Press PAUSE button.
4
0
01
00
Set the data.
IC503
32
17
33
16
48
1
49
64
VC-343 board
3-2-9. Video System Adjustments
m
. Perform this adjustments after performing “3-2-8. 66
MHz/54 MHz Origin Oscillation Adjustment”.
. Check that the data of page: 0, address: 10 is “00”. If
not, set data: 00 to this address.
. Terminate the probe of the oscilloscope with 75 Z.
Y Output Level Adjustment
Mode
Camera
Subject
Arbitrary
Measurement point
DD-208 board, pin 6 of CN151
(75 Z terminated)
Measuring instrument Oscilloscope
Adjustment page
C
Adjustment address
25
Y output level: A = 1000 ± 14 mV
Specification
Adjusting procedure
Order Page Address Data Procedure
1
0
01
01
Set the data.
2
3
0C
02
Set the data, and press
PAUSE button.
3
C
25
Change the data to satisfy the
specification A.
4
C
25
Press PAUSE button.
5
3
0C
00
Set the data, and press
PAUSE button.
6
0
01
00
Set the data.
Center of luminance line
A
H
BRC-300/300P
3-20
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