Sd-Sdi Output Vco Adjustment - Sony HDCU-700A Maintenance Manual Supplement

3-3. Video and Reference Signal System Adjustment

3-3-5. SD-SDI Output VCO Adjustment

Note
Perform this adjustment only when replacing IC21 and/or
IC22 on the DIF-40 board.
Preparations
. Connect the equipments as follows.
. Before adjustment, warm up the unit for about 10
minutes.
CH2
Probe
IN
Oscilloscope
A B C D E F
RV6
1
RV9
1
RV5
RV10
TP7
DIF-40 Board (Component side)
3-14 (E)
CH2 IN
OUT
Frequency
counter
G H J K L
RV1
1
RV4
1 1
1
RV2
RV3
TP1
TP3
Adjustment Procedures (When Replacing IC21)
1. COP2 (F-3) /DIF-40 → TS
2. S6 (M-3) /RC-70 → D1
3. Equipment: Frequency counter
Test point: TP1 (H-5)/DIF-40 board
Adj. point: 1RV3 (F-4) /DIF-40 board
Spec.:
4. S6 (M-3) /RC-70 → D2
5. Equipment: Frequency counter
Test point: TP1 (H-5)/DIF-40 board
Adj. point: 1RV1 (F-4) /DIF-40 board
Spec.:
6. COP2 (F-3) /DIF-40 → NOM
Adjustment Procedures (When Replacing IC22)
1. COP3 (K-5) /DIF-40 → TS
2. S4 (M-2) /RC-70 → D1
3. Equipment: Frequency counter
Test point: TP2 (M-5)/DIF-40 board
Adj. point: 1RV4 (J-4) /DIF-40 board
Spec.:
4. S4 (M-2) /RC-70 → D2
5. Equipment: Frequency counter
Test point: TP2 (M-5)/DIF-40 board
Adj. point: 1RV2 (K-4) /DIF-40 board
Spec.:
M
6. COP3 (K-5) /DIF-40 → NOM
1
2
Note
After 10 minutes or more when these adjustments are
3
complete, check that each specification is met.
4
If not, perform this adjustment again.
5
TP2
27.0 ± 0.2 MHz
14.3 ± 0.1 MHz
27.0 ± 0.2 MHz
14.3 ± 0.1 MHz
HDCU-700A