Sony LX50, LX70S, RMT-V293A, RMT-V294A, LX60S Power Supply Check, Input/Output Levels and Impedance

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

Video input: LINE IN

Input signal: 1 Vp-p, 75 ohms, unbalanced, sync negative

Video output: LINE OUT

Output signal: 1 Vp-p, 75 ohms, unbalanced, sync negative

Audio input: LINE IN

Input level: –7.5 dBs (0 dBs= 0.775 Vrms)

Input impedance: more than 47 kilohms Audio output:LINE OUT

Standard level: –7.5 dBs 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/Video System Adjustments

Audio System Adjustments

2-2.	POWER SUPPLY CHECK
2-2-1.	Output Voltage Check (MA-405 Board)
Mode		STANDBY
+30 V Check
Measurement point		C671 3
Specified value		31.0 to 39.0 V
–11 V Check
Measurement point		Anode of D420
Specified value		–12.5 to – 9.5 V
D+6 V Check
Measurement point		Collector of Q674
Specified value		5.56 to 6.25 V
Mode		E-E
Measuring Instrument		Digital voltmeter
SW+12 V Check
Measurement point		IC660 pin 2
Specified value		11.7 to 12.3 V
SW+5 V Check
Measurement point		Emitter of Q662
Specified value		4.8 to 5.4 V
MTR12 V Check
Measurement point		Collector of Q600
Specified value		12.5 to 14.5 V
F Check
Measurement point		ND420 e; to 1
Specified value		2.0 to 5.0V

[Check Method]

1)Each of these supply voltages must meet its specified value.

6-2