3-22
VIDEO BLOCK
To adjust the video block, connect a pattern generator as shown
below. As video input signals for adjustment, enter video output
signals (color bar signals), unless otherwise specified.
Preparation:
Page Address Data
Sub-Color
NTSC F 54 80
(PAL) (F) (54) (5B)
Switch the NTSC F 14 00
Signal mode (PAL) (F) (14) (01)
[4fsc FreeRun Adjustment]
Condition:
Input signal No signal
Measurement point YC-148 (H) board CN1003 pin 4
Measuring equipment Frequency Counter
Adjustment page F
Adjustment address 55
Specification value 14.31818 MHz ± 200 Hz (NTSC)
Connection:
Adjustment Procedure:
(1) Connect a frequency counter to the CN1003 pin 4 on the
YC-148 (H) board.
(2) Set (or confirm) data: 01 to page: 0, address: 01.
(Cancel F page protect)
(3) On page: F, address: 55, change data with the PLAY and
STOP buttons and press the PAUSE button to write data so
that the frequency counter reading satisfies the specification
value.
Adjustment and Connection Location: YC-148 (H) board
(see page 3-30)
[Video Mute Level Adjustment]
Condition:
Input signal All black (IRE 0%) signal (No set up)
Measurement point YC-148 (H) board CN1003 pin 7
Measuring equipment Oscilloscope
Adjustment page F
Adjustment address 52
Specification value 0 ± 0.03 Vp-p
Connection:
Adjustment Procedure:
(1) Connect a oscilloscope to the CN1003 pin 7 on the YC-148
(H) board.
(2) Set (or confirm) data: 01 to page 0, address 01. (Cancel F
page protect)
(3) On page F, address: 52, change data with the PLAY and STOP
buttons and press the PAUSE button to write data so that the
A level of waveform on the oscilloscope satisfies the speci-
fication value.
Adjustment and Connection Location: YC-148 (H) board
(see page 3-30)
9H 10H 25H
24H11H
A
CN1003 pin
4
(4FSC)
YC-148 (H) Board
Frequency Counte
+
–
+
–
Oscilloscope
(DC range)
CN1003 pin
7
(YOUT)
CN1003 pin
1
(GND)
YC-148 (H) Board
S-VIDEO jack (J1401)
Pattern Generator
Set
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2
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1
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9
4
2
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1
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0
5
1
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3
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Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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