Input/Output Levels And Impedance; Adjustment Sequence; Power Supply Check; Output Voltage Check (Ma-339 Board) - Sony SLV-SE70 Service Manual

2-1-5.

Input/Output Levels and Impedance

Video input: LINE-1 (TV)/LINE-2 IN/LINE-3 IN
Input signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
Video output: LINE-1 (TV)
Output signal: 1 Vp-p, 75 ohms, unbalanced,
sync negative
Audio input: LINE-1 (TV)/LINE-2 IN/LINE-3 IN
Input level: –7.5 dBs
(0 dBs= 0.775 Vrms)
Input impedance: more than 47 kilohms
Audio output:LINE-1 (TV)
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 System Adjustments
Audio System Adjustments
2-2. POWER SUPPLY CHECK
2-2-1.

Output Voltage Check (MA-339 Board)

Mode
+38 V Check
Measurement point
Specified value
+13 V Check
Measurement point
Specified value
+12 V Check
Measurement point
Specified value
+6 V Check
Measurement point
Specified value
+5 V Check
Measurement point
Specified value
MTR12 V Check
Measurement point
Specified value
C +5V Check
Measurement point
Specified value
+F, –F Check
Measurement point
Specified value
–11 V Check
Measurement point
Specified value
[Check Method]
1) Each of these supply voltages must meet its specified value.
6-2
E-E
CN600 pin 4
35.0 to 41.0 V
CN600 pin 5,6
12.5 to 14.5 V
IC601 pin 2
11.0 to 13.0 V
CN600 pin !¢
5.40 to 6.40 V
CN600 pin 2, 3
4.7 to 5.7 V
CN600 pin 7, 8
12.5 to 14.5 V
D603 Cathode
4.5 to 5.5 V
CN600 pin !§, !ª
1.9 to 3.9 V
CN600 pin !•
–12.5 to – 10.5 V