Overall S/N Check; Tuner System Adjustment; Separation Adjustment - Sony SLV-EX50 Service Manual

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4. Overall Level Characteristic and Distortion Factor
Check
Purpose:
Check the record level, play level, and distortion factor against the
reference input.
Mode
Signal
Measurement point
Measurement equipment
Specified value
Confirmation Method:
1) Supply an audio signal of 400 Hz, –7.5 dBs simultaneously to
both L and R channels of Audio Line Input.
2) Make recording
3) Play back a recorded portion.
4) Confirm that a playback level is –7.5 ± 4.0 dBs. (mono audio)
5) Confirm that a distortion factor is less than 4%.

5. Overall S/N Check

Purpose:
Confirm that the S/N is within the specification.
Mode
Signal
Measurement point
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L 13942296513
Measurement equipment
Specified value
Confirmation Method:
1) Connect both L and R channels of audio line input to the GND.
2) Start recording.
3) Play the recorded part to confirm that the noise is below –46.0
dBs.
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REC and PB (SP mode)
400 Hz, –7.5 dBs
Audio output terminal
Audio level meter and
distortion factor meter
Playback level: –7.5 ± 4.0 dBs
Distortion factor: 4% or less
REC and PB (SP mode)
Short
Audio output terminal
Audio noise meter
–46.0 dBs or less
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2-5.

TUNER SYSTEM ADJUSTMENT

[Connection]
Up channel
convertor
RF IN
Fig. 7-2-6
2-5-1.

Separation Adjustment

(SLV-EX80S/EX90S)
Purpose:
Mixed audio signal separate Lch and Rch.
Mode
Signal
Q Q
3 6 7 1 3 1 5
Measurement point
Measurement equipment
Adjusting Element
Specified value
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7-5
9 4 2 8
Audio level
meter
47 kΩ
L
VCR
R
AUDIO LINE OUT
E-E
VIDEO:
color bar
(White 100% modulation)
AUDIO:
L NONE
R 1 kHz 60% modulation
ELECTRIC FIELD:
0 5 8 2 9 60–80 dBs/75 Ω Term 9 4 2 8
Pin qx of IC701
Audio level meter
RV701 (MA-402 Board)
minimum -9.9 ± 0.2 dBm
(700 ± 14mVp-p)
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