Y Signal Clamp Reference Voltage Adjustment (Jc-20 Board); Cr Signal Clamp Reference Voltage Adjustment (Jc-20 Board); Cb Signal Clamp Reference Voltage Adjustment (Jc-20 Board); Afc Preliminary Adjustment (Jc-20 Board) - Sony DSR-50P Service Manual

4. Y Signal Clamp Reference Voltage Adjustment
(JC-20 Board)
Mode E-E
Signal Color bar
Measuring Point Pin 8 of IC1102 (CL1161)
Measuring Instrument Digital voltmeter
Adjustment Element RV1103
Specified value A = 1.150 ± 0.005 Vdc
Connection: Connect a jumper wire between Pin 6 of IC1101
(CL1145 or Q1116 collector) and GND.
Adjusting method:
1) Set the Y signal clamp reference voltage (A) to the specified
value using RV1103.
5. CR Signal Clamp Reference Voltage Adjustment
(JC-20 Board)
Mode E-E
Signal Color bar
Measuring Point Pin 8 of IC1103 (CL1160)
Measuring Instrument Digital voltmeter
Adjustment Element RV1102
Specified value A = 1.915 ± 0.005 Vdc
Connection: Connect a jumper wire between Pin 6 of IC1101
(CL1145 or Q1116 collector) and GND.
Adjusting method:
1) Set the CR signal clamp reference voltage (A) to the specified
value using RV1102.
6. CB Signal Clamp Reference Voltage Adjustment
(JC-20 Board)
Mode E-E
Signal Color bar
Measuring Point Pin 8 of IC1104 (CL1162)
Measuring Instrument Digital voltmeter
Adjustment Element RV1104
Specified value A = 1.915 ± 0.005 Vdc
Connection: Connect a jumper wire between Pin 6 of IC1101
(CL1145 or Q1116 collector) and GND.
Adjusting method:
1) Set the CB signal clamp reference voltage (A) to the specified
value using RV1104.

7. AFC Preliminary Adjustment (JC-20 Board)

Mode
Signal
Measuring Point
Measuring Instrument
Adjustment Element
Specified value
Adjusting method:
1) Set the DC voltage (A) to the specified value using CT2200.

8. AFC Picture Frame Adjustment (JC-20 Board)

Mode
Signal
Measuring Point
Measuring Instrument
Adjustment Element
Specified value
Adjusting method:
1) Set the time difference (T) between the center of COMP SYNC
falling and AFH rising to the specified vale using RV2201.
CH1
CH2
Magnified
CH1
CH2
T

9. AFC Adjustment (JC-20 Board)

Mode
Signal
Measuring Point
Measuring Instrument
Adjustment Element
Specified value
Adjusting method:
1) Set the DC voltage (A) to the specified value using CT2200.
5-55
Recording
Color bar
Pin 9 of IC2204 (CL2214)
Digital voltmeter
CT2200
A = 1.9 ± 0.5 Vdc
Recording
Color bar
CH1: Pin wa of IC1108 (CL1157)
CH2: Pin wk of IC2204 (CL2217)
Oscilloscope
RV2201
T = 110 ± 10 nsec
H
Fig. 5-3-6
Recording
Color bar
Pin 9 of IC2204 (CL2214)
Digital voltmeter
CT2200
A = 1.90 ± 0.05 Vdc