Overall S/N Check; Tuner System Adjustment; Separation Adjustment - Sony SLV-ED115 Service Manual

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
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.
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
7-5
2-5.

TUNER SYSTEM ADJUSTMENT

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

Separation Adjustment

(SLV-EZ715AS/EZ717AS)
Purpose:
Mixed audio signal separate Lch and Rch.
Mode
Signal
Measurement point
Measurement equipment
Adjusting Element
Specified value
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:
60–80 dBs/75 Ω Term
Audio output terminal
Audio level meter
RV001 (GK-12 Board)
minimum