Input/Output Levels And Impedance; Adjustment Sequence; Power Supply Check; Output Voltage Check (Ma-317 Board) - Sony SLV-478 Service Manual

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2-1-5. Input/Output Levels and Impedance

Video input: LINE IN
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Video output: LINE OUT
Output signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Audio input: LINE IN
Input level: –7.5 dBs
(0dBs= 0.775Vrms)
Input impedance: more than 47 kilohms
Audio output: LINE OUT
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.

Power Supply Check

Servo System Adjustments
Audio System Adjustments
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L 13942296513
Video System Adjustments
Tuner System Adjustments
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2-2. POWER SUPPLY CHECK

2-2-1. Output Voltage Check (MA-317 Board)

Mode
Measuring Instrument
SW 12V Check
Measurement point
Specified value
MTR12V Check
Measurement point
Specified value
SW5V Check
Measurement point
Specified value
[Check Method]
1) Each of these supply voltages must meet its specified value.
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3 6 7 1 3 1 5
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6-2
9 4 2 8
E-E
Digital voltmeter
IC601 pin 2
12.0 ± 0.3V
Q605 C
13.5 ± 1.0V
Q603 E
5.1 ± 0.3V
0 5 8 2 9 9 4
m
9 9
2 8 9 9