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3-3. Video and Reference Signal System Adjustment
3-3-2. HD-SDI Output VCO Free-run
Adjustment
Note
Disconnect cables from REFERENCE IN connectors of
DIF-40 and SDI-11 boards.
Preparations
. Before adjustment, warm up the unit for about 10
minutes.
. S31 (M-7) /AT-103 board → LOCAL
. S15 (M-5) /AT-103 board → HD
. S30 (M-2) /AT-103 board → ON (60)
. Connect the equipments as follows.
CH2
Probe
IN
Oscilloscope
9
8
7
6
RV20
RV19
TP24
TP26
RV15
1
RV16
1
RV5
1
S31
AT-103A Board (Component side)
3-12 (E)
CH2
IN
OUT
Frequency
counter
5
4
3
2
1
RV21
1
S18
TP16
TP15
S19
RV1
RV2
TP21
S24
S25
TP20
TP19
TP22
RV6 RV8
RV7 RV9
1
S15
S21
RV12
RV3
RV11
RV17
1
S30
RV4
RV10
Adjustment Procedures
1. HD (60) Frequency Adjustment
Equipment: Frequency counter
Test point: TP26 (B-6) /AT-103A board
Adj. point: 1RV16 (E-6) /AT-103A board
74,250,000 ± 10 Hz
Spec.:
2. S30 (M-2) /AT-103A → OFF (59.94)
3. HD (59.94) Frequency Adjustment
Equipment: Frequency counter
Test point: TP26 (B-6) /AT-103A board
Adj. point: 1RV5 (F-6) /AT-103A board
74,175,750 ± 10 Hz
Spec.:
4. S15 (M-5) /AT-103A → SD
5. SD (59.94) Frequency Adjustment
Equipment: Frequency counter
Test point: TP24 (B-8) /AT-103A board
Adj. point: 1RV15 (C-9) /AT-103A board
27,000,000 ± 10 Hz
A
Spec.:
B
Resetting after Adjustments
C
After adjustments are complete, return the switches to their
original positions. and disconnect resistors.
D
E
F
G
H
J
K
L
M
HDCU-700A
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