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 :
1
RV601 (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
TP613
TP608
TP401
S504
S603
S126
S602
S601
R
V501
R
V502
R
V506
R
V505
R
V405
S503
TP503
TP504
S41
S403
S128
1
1
1
1
1 1
1
A
B
C
D
E
F
G
H
J
K
L
M
1
2
3
4
5
6
7
8
9
S401
S402
RV402
1
RV604
1
RV603
1
RV605
1
RV602
RV401
S102
S110
S101
3-4. Video Signal System Adjustment (RC-86 Board)
