6-12
6. 28MHz crystal oscillator adjustment
(VC-188 board)
Purpose :
Adjusts 28MHz crystal controlled oscillation
for synchronizing clock.
Adjustment error :
Loss of synchronization or loss of color.
Subject
Not required
Measurement Point
IC201
%¢
pin
Measuring Instrument
Frequency counter
Adjustment Page
F
Adjustment Address
3D
Specification
4433618.75 ± 17Hz (PAL)
3579545 ± 17Hz (NTSC)
Adjustment procedure:
Reference: Conversion between the hexadecimal
number and decimal number.
In some adjustment items, data appears in hexadecimal numbers on
the DDS display or on the adjustment remote commander.
Maintenance engineers are expected to convert the displayed
hexadecimal numbers to the corresponding decimal numbers using
Order
Page
Address
Data
Procedure
1
6
00
01
After setting the data, press the PAUSE button. (Preparation)
2
F
3D
Change the data using PLAY, STOP buttons until the frequency satisfies the specification.
3
F
3D
Press the PAUSE button.
4
6
00
00
After setting the data, press the PAUSE button. (End)
the following conversion table.
Make a required calculation described in each adjustment item. Then
re-convert the result of calculation back from the decimal numbers
to the corresponding hexadecimal numbers using the following
conversion table.
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