Sony DSR-20MD, Service Manual

Page: 163 / 225

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3-5-2. JC-19 Board Adjustments
1. A/D Converter Reference Voltage Adjustment 1
(JC-19 Board)
Mode E-E
Signal Arbitrary
Measurement Point Pin 5 of IC013 (CL061)
Measuring Instrument Digital voltmeter
Adjusting Element RV001
Specified Value A = 2.83 ± 0.01 Vdc
Adjusting method:
1) Set the VRT voltage (A) to the specified value using RV001.
2. A/D Converter Reference Voltage Adjustment 2
(JC-19 Board)
Mode E-E
Signal Arbitrary
Measurement Point Pin
3
of IC013 (CL062)
Measuring Instrument Digital voltmeter
Adjusting Element RV002
Specified Value A = 0.96 ± 0.01 Vdc
Adjusting method:
1) Set the VBT voltage (A) to the specified value using RV002.
3. Y Signal Clamp Reference Voltage Adjustment
(JC-19 Board)
Mode E-E
Signal Color bar
Measurement Point Pin
8
of IC011 (CL054)
Measuring Instrument Digital voltmeter
Adjusting Element RV011
Specified Value A = 1.150 ± 0.005 Vdc
Connection: Connect a jumper wire between Pin
6
of IC018
(CL150) and GND.
Adjusting method:
1) Set the Y signal clamp reference voltage (A) to the specified
value using RV011.
4. CR Signal Clamp Reference Voltage Adjustment
(JC-19 Board)
Mode E-E
Signal Color bar
Measurement Point Pin
8
of IC010 (CL052)
Measuring Instrument Digital voltmeter
Adjusting Element RV010
Specified Value A = 1.900 ± 0.005 Vdc
Connection: Connect a jumper wire between Pin
6
of IC018
(CL150) and GND.
Adjusting method:
1) Set the CR signal clamp reference voltage (A) to the specified
value using RV010.
5. CB Signal Clamp Reference Voltage Adjustment
(JC-19 Board)
Mode E-E
Signal Color bar
Measurement Point Pin
8
of IC009 (CL053)
Measuring Instrument Digital voltmeter
Adjusting Element RV012
Specified Value A = 1.900 ± 0.005 Vdc
Connection: Connect a jumper wire between Pin 6 of IC018
(CL150) and GND.
Adjusting method:
1) Set the CB signal clamp reference voltage (A) to the specified
value using RV012.