Sony RMT-V244, Руководство по обслуживанию

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7-2
3-1-6. Adjusting Sequence
Make the electrical adjustment in the following sequence.
Mode E-E
Measuring Instrument Digital voltmeter
–10 V check
Measurement Point Pin
9
of CN600
Specified Value –10.3 ±0.8 V
+6 V check
Measurement Point Pin
7
,
8
of CN600
Specified Value 5.9 ± 0.2 V
+13 V check
Measurement Point Pin
2
,
3
of CN600
Specified Value 13.3 ± 0.5 V
+35 V check
Measurement Point Pin
1
of CN600
Specified Value 38.0 ± 3.0 V
3-2. POWER SUPPLY ADJUSTMENT
3-2-1. Power Supply Check
(SR-718 BOARD)
Checking Method:
1) Confirm that each voltage meets its specified value.
3-2-2. +6 V Adjustment
(SR-718 BOARD)
Mode REC or PB
Measuring Instrument Digital voltmeter
Measurement Point Pin
7
,
8
of CN201
Adjusting Element RV201
Specified Value 5.9 ± 0.2 V
Checking power supply
Servo system adjustment
Audio system adjustment
Video system adjustment
1
2
3
4
Mode
SP
SP
EP
EP
Video signal
Color bar
Monoscope
Color bar
Monoscope
Audio signal
(HiFi/Normal)
400 Hz
Time
Seven minutes
Three minutes
Seven minutes
Three minutes
Fig. 7-3-2
3-1-4. Alignment Tapes
[Alignment Tape (KRV-51N2)]
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.
3-1-5. Specified I/O Level and Impedance
Input/Output Terminal
Video inputs LINE IN : phono jack
1 Vp-p, 75
Ω
, unbalanced, sync negative
Audio inputs LINE IN : phono jacks
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 k
Ω
Output impedance : less than 10
Ω