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3-12 (E)
HDCU-900 MM
3-4-2. SD-SDI Input VCO Free-run
Adjustment
Measure : Frequency counter
Note
After replacing IC601 on the RC-86 board only, perform
this adjustment.
Preparation
. Board extension : RC-86 board (front side)
. S110 (L-8)/AT-141 → LOCAL
. S101 (L-8)/AT-141 → All OFF
. COR601 (A-3)/RC-86 → FREE RUN (Short between 2-
pin and 3-pin.)
. Connect the measure as shown in the following figure.
. After turning on the power, wait for 10 minutes at least
and start adjustment.
Adjustment Procedure
Measuring point : TP603 (C-1)/RC-86
Adjusting point : 1RV601 (B-3)/RC-86
Specifications : 27.0 ±0.2 MHz
Note
After finishing the adjustment and waiting for 10 minutes
at least, confirm that each specification is satisfied.
If the specifications are not satisfied, perform the adjust-
ment again.
Setting after Adjustment
. After finishing the adjustment, return the switches to the
original setting.
. COR601 (A-3)/RC-86 → NORMAL
(Short between 1-pin and 2-pin.)
AT-141 board (A side)
Probe
Oscilloscope
Frequency
counter
CH2
IN
CH2
OUT
IN
S404
TP405
TP502
TP402
TP613TP608
TP401
S504
S603
S126S602
S601
RV501
RV502
RV506
RV505
RV405
S503
TP503
TP504
S41 S403
S128
1
1
11
1
1
1
A
B
C
D
E
F
G
H
J
K
L
M
123456789
S401
S402
RV402
1
RV604
1
RV603
1
RV605
1
RV602
RV401
S102
S110
S101
3-4. Video Signal System Adjustment (RC-86 Board)