2-2. Preparation for Adjustment
1. Connect the equipment and tools. (Refer to Section 21-2.) 2. Set the switches on the ADC-35 board. (Refer to Section 2-1-3.) 3. Turn on the power of the digital interface unit (PFVD20/D50/D100A/D200A/D300) and warm up the unit for about 10 minutes.
2-3. Free-running Frequency Adjustment
Measurement equipment Oscilloscope Frequency counter Procedure 1. Supply 100% color bars signal from the signal generator to the ANALOG IN connectors. 2. Set the oscilloscope as follows. CH2 : 0.5 V/DIV AC TIME : 20 ns/DIV TRIG : CH2 (TP403) 3. Connect the CH2 probe of the oscilloscope to TP403. Connect the GND probe to E5. 4. Turn 1RV406 clockwise until the frequency level satisfies the specification. 5. After the adjustment is completed, set S401 to OFF. Measuring point : TP403 (J-6)/ADC-35 Adjustment point : 1RV406 (H-6)/ADC-35 Specification : 26.9 ±0.1 MHz
Component side (A side)
n 1RV203 (F-2) and 1RV303 (F-3) are used for factory setting. Do not change the settings. Set the switches before the adjustment as below.
Ref. No. (Address) S401 (G-6) S500 (H-5) S504 (A-6) S601 (A-4) S602 (A-5) 1RV406 (H-6) 1RV501 (H-4) Initial Setting ON H INT CCIR YUV Counterclockwise Mechanical center
