Overall S/N Check; Normal Audio System Adjustment; Ace Head Adjustment; E-E Output Level Check - Sony SLV-ED10ME Service Manual

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3. 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 ±2.0 dBs.
5) Confirm that a distortion factor is within 1%.

4. Overall S/N Check

Purpose:
Confirm that the S/N is within the specification.
Mode
Signal
Measurement point
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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 –67.5
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 ± 2.0 dBs
Distortion factor: 1% or less
REC and PB (SP mode)
Short
Audio output terminal
Audio noise meter
–67.5 dBs or less
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Normal Audio System Adjustment

• Make adjustment in the SP mode, unless otherwise specified.
Use a normal VHS cassette for an adjustment tape.
• Set AUDIO MONITOR to normal.
[Adjustment Sequence]

1. ACE Head Adjustment

2. E-E Output Level Check

3. Frequency Response Check
4. Overall Level Characteristic and Distortion Factor
Check
5. Overall S/N Check
1. ACE Head Adjustment
Refer to the SERVICE MANUAL of VHS MECHANICAL AD-
JUSTMENT VI.
2. E-E Output Level Check
(SLV-ED10/ED40/EZ10/EZ40)
Purpose:
Confirm that the output level against the reference input is within
the specification.
Mode
Signal
Measurement point
Measurement equipment
Specified value
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Confirmation Method:
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1) Simultaneously input a signal of 400 Hz, –7.5 dBs to both L
and R channels of Audio Line Input.
2) Confirm that the audio output level is –7.5 ± 3.0 dBs.
(This level only can appear with mono models)
3. Frequency Response Check
Purpose:
Confirm that the frequency characteristic is within the specifica-
tion.
Mode
Signal
Measurement point
Measurement equipment
Specified value
Tape path adjustment must have been completed.
Confirmation Method:
1) Supply a signal of 400 Hz, –17.5 dBs to both L and R chan-
nels of Audio Line Input.
2) Connect the audio level meter to the Audio Line Output.
3) Adjust the attenuator so that the audio level meter will indi-
cate –17.5 dBs.
4) Make recording in the SP mode.
5) Set an audio line input signal to 7 kHz and make recording.
6) Playback a recorded portion, and measure output levels at 400
co
Hz and 7 kHz.
7) Confirm that the 7 kHz playback output level within a range
.
of the 400 Hz playback output level 2.5 ± 4.0 dB.
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E-E
L, R: 400 Hz, –7.5 dBs
Audio output terminal
Audio level meter
–7.5 ± 3.0 dBs
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REC and PB (SP mode)
400 Hz, –17.5 dBs
7 kHz, –17.5 dBs
Audio output terminal
Audio level meter
2.5 ± 4.0 dB
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