Input/Output Levels And Impedance; Adjustment Sequence; Power Supply Check; Output Voltage Check (Ma-316 Board) - Sony SLV-E850B Service Manual

QQ
3 7 63 1515 0
2-1-5.

Input/Output Levels and Impedance

Video input: LINE IN
EURO
Input signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Video output: LINE OUT
EURO
Output signal: 1Vp-p, 75ohms, unbalanced,
sync negative
Audio input: LINE IN
EURO
Input level: –7.5 dBs
(0dBs= 0.775Vrms)
Input impedance: more than 47 kilohms
Audio output: LINE OUT
EURO
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
TE
L 13942296513
Audio System Adjustments
Video System Adjustments
www
.
http://www.xiaoyu163.com
x ao u163
y
i
http://www.xiaoyu163.com
2 9
8
2-2. POWER SUPPLY CHECK
2-2-1.

Output Voltage Check (MA-316 Board)

Mode
Measuring Instrument
TUNER 30V Check
Measurement point
Specified value
VCC 12V Check
Measurement point
Specified value
D 5V Check
Measurement point
Specified value
[Check Method]
1) Each of these supply voltages must meet its specified value.
2-3.

SERVO SYSTEM CHECK

Unless otherwise specified, set the switches to the following
positions.
• INPUT SELECT switch ................................................. LINE 1
• TAPE SPEED switch ............................................................ SP
2-3-1.

RF Switching Position/

AF Switching Position Adjustments

(MA-316, RP-231 Boards)

[Adjustment Purpose]
Q Q
3 6 7 1 3 1 5
To adjust the link of the A-ch and B-ch of the tape playback outputs.
To make the unit compatible with other tapes and units. If this
specification is not satisfied, the link will appear on the screen and
the screen will be disrupted, etc.
Mode
Signal
Measurement point
Measuring instrument
Specified value
co
.
6-2
9 4 2 8
E-E
Digital voltmeter
D702 Cathode
33 ± 2V
IC530 Pin 2
12.0 ± 0.3V
D160 Cathode
5.2 ± 0.3V
0 5 8 2 9 9 4
Playback
Alignment tape: SP color bar portion
CH1: Video LINE OUT
(RF switching position)
CN341 pin 1 (HF ADJ)
(AF switching position)
(RP-231 board)
CH2: CN261 pin 3 (RF SWP)
(RP-231 board)
Oscilloscope
6.5 ± 0.5H (416 ± 32 µsec)
m
9 9
2 8 9 9