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2-1-5.
Input/Output Levels and Impedance
Video input:
LINE IN
(phono jack) (1)
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Video output:
LINE OUT
(phono jack) (1)
Output signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Audio input:
LINE IN
(phono jack) (1)
Input level: -7.5 dBs
(0dBs=0.775Vrms)
Input impedance: more than 47 kilohms
Audio output:
LINE OUT
(phono jack) (1)
Standard level: -7.5dBs at load impedance 47
kilohms
Output impedance: less than 10 kilohms
2-1-6.
Adjustment Sequence
The adjustments should be performed in the following sequence.
2-2.
POWER SUPPLY CHECK
2-2-1.
Output Voltage Check (MA-249 Board)
Mode E-E
Measuring Instrument
Digital voltmeter
SW 12V Check
Measurement point
IC141 pin w
Specified value
12.0 ± 0.3V
MTR12V Check
Measurement point
D131 cathode
Specified value
12.4 ± 0.5V
SW5V Check
Measurement point
Q161 emitter
Specified value
5.1 ± 0.2Vdc
D5V Check
Measurement point
D505 cathode
Specified value
5.1 ± 0.2V
[Check Method]
1) Each of these supply voltages must meet its specified value.
7-2
Power Supply Check
Servo System Adjustments
Video System adjustments
Audio System adjustments
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