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3-9 (E)
HDCU-900 MM
3-3. Video and Reference Signal System
Adjustment
3-3-1. HD-SDI Output VCO Free-run
Adjustment
Measure : Frequency counter
Preparation
. Board extension: AT-141 board (front side)
. Remove the cable connected to the REFERENCE IN
connector on the HDCU rear panel.
. S603 (L-6)/AT-141 →/1000
. S601 (REMOTE/LOCAL)/AT-141 board panel side →
LOCAL
. S602 (REFERENCE)/AT-141 board panel side → HD
. S102-8 (K-6)/AT-141 → OFF
. 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
1. HD (60) frequency adjustment
Measuring point : TP613 (B-7)/AT-141
Adjusting point : 1RV604 (D-5)/AT-141
Specifications : 74,250,000 ±10 Hz
2. S603 (L-6)/AT-141 → /1001
3. HD (59.94) frequency adjustment
Measuring point : TP613 (B-7)/AT-141
Adjusting point : 1RV603 (D-5)/AT-141
Specifications : 74,175,750 ±10 Hz
4. S602 (REFERENCE)/AT-141 board panel side→ BB
5. SD frequency adjustment
Measuring point : TP608 (B-8)/AT-141
Adjusting point : 1RV602 (E-9)/AT-141
Specifications : 27,000,000 ±10 Hz
Probe
Oscilloscope
Frequency
counter
CH2
IN
CH2
OUT
IN
3-3. Video and Reference Signal System Adjustment
Setting after Adjustment
After finishing the adjustment, return the switches to the
original setting.
3-3-2. Clock (74 MHz) Duty Adjustment/AT
Board
Measure : Oscilloscope (20 MHz BWLimit: ON)
Adjustment Procedure
Measuring point : TP613 (B-7)/AT-141
Adjusting point : 1RV605 (E-6)/AT-141
Specifications : C = 1.65 ±0.04 Vdc
When this adjustment is completed, perform “3-3-3. Clock
(74 MHz) Duty Adjustment/DPR Board”.
A
B
A=B
C
GND