6-2
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.
2-2.
POWER SUPPLY CHECK
2-2-1.
Output Voltage Check (MA-316 Board)
Mode
E-E
Measuring Instrument
Digital voltmeter
TUNER 30V Check
Measurement point
D702 Cathode
Specified value
33 ± 2V
VCC 12V Check
Measurement point
IC530 Pin
2
Specified value
12.0 ± 0.3V
D 5V Check
Measurement point
D160 Cathode
Specified value
5.2 ± 0.3V
[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]
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
Playback
Signal
Alignment tape: SP color bar portion
Measurement point
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)
Measuring instrument
Oscilloscope
Specified value
6.5 ± 0.5H (416 ± 32
µ
sec)
Power Supply Check
Servo System Adjustments
Video System Adjustments
Audio System Adjustments
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