Sony SLV-7700KME, Руководство по обслуживанию

Страница: 104 / 135

7-10
2-7-7. E-E Output Level Check
Mode E-E
Signal 400Hz, – 7.5dBs : LINE-1 IN AUDIO terminal
Measurement
LINE-1 OUT AUDIO terminal
point
Measuring
Audio level meter
instrument
Specified
– 7.5 ± 2dBs
value
[Check Method]
1)
Input signal of 400Hz and –7.5 dBs to the L and R channel of
the audio input at the same time.
2) Check that the audio output level is –7.5 ± 2dBs.
2-7-8. Overall Output Level and Distortion Factor Check
Mode Self-record playback
Signal
400Hz, –7.5dBs : LINE-1 IN AUDIO
terminals, left and right
Measurement
LINE-1 OUT AUDIO terminal
point
Measuring
Audio level meter and Distortion meter
instrument
Specified Playback Level : –7.5 ± 3dBs
value Distortion : 4.0% or less
[Check Method]
1)
Record signal.
2) Playback the recorded portion.
3) Check that the output level is –7.5 ± 3dBs.
4) Check that the distortion factor is 4.0% or less on the left and
right side.
2-7-9. Overall Noise Level Check
Mode Self-record playback
Signal
No signal (Insert a shorting plug into the
LINE-1 OUT AUDIO jacks, left and right.)
Measurement
LINE-1 OUT AUDIO terminal
point
Measuring
Audio level meter
instrument
Specified
–46dBs or less
value
[Check Method]
1)
Record.
2) Playback recorded portion.
3) Check that noise level is –46dBs or less on the left and right
side.
r Normal Audio System Adjustment
• Adjust in the SP mode if there is no special indications.
• Perform the adjustment setting the switch on the following
positions.
• INPUT SELECT (VHS) switch .......................................... 1
• AUDIO MONITOR switch * ........................... NORMAL* 1
*1 : No indicates on the display window indicator and monitor TV.
[Adjustment Sequence]
1)
ACE head adjustment .... Refer to the VHS mechanical part
adjustment manual
2) Recording bias check
3) E-E output level check
4) Overall output level and distortion factor check.
5) Overall noise level check.
2-7-5. ACE Head Adjustment
Refer to the "VHS Mechanical adjustment manual "
(9-973-623-11).
2-7-6. Recording Bias Check (MA-303 Board)
Mode Self-record playback
Signal
400Hz, – 27.5dBs LINE-1 IN AUDIO
7kHz, – 27.5dBs terminal (L or R)
Measurement
LINE-1 OUT AUDIO terminal
point
Measuring
Audio level meter
instrument
Specified
0 ± 3dBs
value
[Adjusting Method]
1)
Supply a signal of 400Hz, –27.5dBs to 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 indicate
–27.5dBs.
4) Make recording in the SP mode.
5) Set an audio line input signal to 7kHz and make recording.
6) Playback a recorded portion, and measure output levels at
400Hz and 7kHz.
7) Confirm that the 7kHz playback output levels within a range
of the 400Hz playback output level 0±3dB.