5-55
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
Recording
Signal
Color bar
Measuring Point
Pin
9
of IC2204 (CL2214)
Measuring Instrument
Digital voltmeter
Adjustment Element
CT2200
Specified value
A = 1.9 ± 0.5 Vdc
Adjusting method:
1) Set the DC voltage (A) to the specified value using CT2200.
8.
AFC Picture Frame Adjustment (JC-20 Board)
Mode
Recording
Signal
Color bar
Measuring Point
CH1: Pin
wa
of IC1108 (CL1157)
CH2: Pin
wk
of IC2204 (CL2217)
Measuring Instrument
Oscilloscope
Adjustment Element
RV2201
Specified value
T = 110 ± 10 nsec
Adjusting method:
1) Set the time difference (T) between the center of COMP SYNC
falling and AFH rising to the specified vale using RV2201.
Fig. 5-3-6
9.
AFC Adjustment (JC-20 Board)
Mode
Recording
Signal
Color bar
Measuring Point
Pin
9
of IC2204 (CL2214)
Measuring Instrument
Digital voltmeter
Adjustment Element
CT2200
Specified value
A = 1.90 ± 0.05 Vdc
Adjusting method:
1)
Set the DC voltage (A) to the specified value using CT2200.
H
Magnified
T
CH1
CH2
CH1
CH2
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