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3-1-3.
Set-up of Adjustment
In this adjustment, NTSC pattern generator is connected with LINE
input signal terminal. When check to tuner, connected AERIAL
terminal. Check that the amplitudes of video signal SYNC signal,
of picture portions, and of burst signals are flat at approximately
0.3, 0.7 and 0.3 V, respectively, and that the level ratio of the burst
signal and "red" signal are 0.30: 0.66. Fig. 7-3-2. shows video
signals (color bars) used in adjusting the video section.
Fig. 7-3-2
3-1-4.
Alignment Tapes
[Alignment Tape (KRV-51N2)]
Mode
Time
1
SP
Seven minutes
2
SP
Three minutes
3
EP
Seven minutes
4
EP
Three minutes
3-1-5.
Specified I/O Level and Impedance
Input/Output Terminal
Video inputs
LINE IN
1 Vp-p, 75 Ω, unbalanced, sync negative
Audio inputs
LINE IN
47 kW, –7.5 dBs (0 dBs = 0.775 Vrms)
More than 10 kW, –4 dBs
Video outputs
LINE OUT: phono jack
1 Vp-p, 75 Ω, unbalanced, sync negative
Audio outputs
LINE OUT: phono jacks
–7.5 dBs at load impedance 47 kΩ
Output impedance : less than 10 Ω
Audio signal
Video signal
(HiFi/Normal)
Color bar
Monoscope
400 Hz
Color bar
Monoscope
: phono jack
: phono jacks
3-1-6.
Adjusting Sequence
Make the electrical adjustment in the following sequence.
Checking power supply
Servo system adjustment
Audio system adjustment
3-2.
POWER SUPPLY ADJUSTMENT
3-2-1.
Power Supply Check
(SR-718 BOARD)
Mode
Measuring Instrument
–10 V check
Measurement Point
Specified Value
+6 V check
Measurement Point
Specified Value
+13 V check
Measurement Point
Specified Value
+35 V check
Measurement Point
Specified Value
Checking Method:
1) Confirm that each voltage meets its specified value.
3-2-2.
+6 V Adjustment
(SR-718 BOARD)
Mode
Measuring Instrument
Measurement Point
Adjusting Element
Specified Value
7-2
Video system adjustment
E-E
Digital voltmeter
Pin 9 of CN600
–10.3 ±0.8 V
Pin 7, 8 of CN600
5.9 ± 0.2 V
Pin 2, 3 of CN600
13.3 ± 0.5 V
Pin 1 of CN600
38.0 ± 3.0 V
REC or PB
Digital voltmeter
Pin 7, 8 of CN201
RV201
5.9 ± 0.2 V
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