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11.
PB Matrix L Adjustment (AU-135 board)
Self recording/playback
No signal: Audio input terminal (left)
400 Hz, -7.5 dBs: Audio input
terminal (right)
PAdiuinentPage [D——id|
Adjusting method:
1)
Release the protect.
Page: 1, address: 00, data: 01
2)
Input the 400 Hz, —7.5 dBs signal only to the audio input
terminal (right). (Insert the shorting plug to the audio input
terminal (left).)
3)
Record.
4)
Remove the input signal.
5)
Playback the recorded section.
6)
Change the data of page: D, address: 79, and minimize the
cross talk component (400 Hz).
7)
Press the PAUSE button of the adjusting remote control
unit.
Signal
12.
PB Matrix R Check (AU-135 board)
Self recording/playback
400 Hz, —7.5 dBs: Audio input
terminal (left)
No signal: Audio input terminal
(right)
Measurement Point
Pin ® of IC604
Measuring Instrument | Oscilloscope
Specified Value
Below 30 mVp-p
Checking method:
1)
Input the 400 Hz, -7.5 dBs signal only to the audio input
terminal (left). (Insert the shorting plug to the audio input
terminal (right).)
2)
Record.
3) Remove the input signal.
4)
Playback the recorded section.
5)
Check that the cross talk component (400 Hz) is below 30
mVp-p.
terminal (left)
[right]
:
Audio
level
meter
and
distortion
Measuring Instrument
meter
See
Level: -8.5 + 2 dBs
Spreitied Value
Distortion rate: Below 0.8% (Note 2)
13.
Overall Level Characteristic, Distortion Check
[Mode
=|
Self recording/playback
No signal: Audio input terminal
(right) [left]
Note: 1) The [ ] indicates the measuring point during the right
channel check
400 Hz, -7.5 dBs: Audio input
Audio output terminal (left) [right]
2) Value when the following filter is used
200 Hz
6 kHz
18d B/OCT
18 dB/OCT
Fig. 9-29.
Checking method:
1) Input the 400 Hz, -7.5 dBs signal only to the audio input
terminal (left) [right].
Note: Be sure to insert the shorting plug to the terminal
that was not signal input.
2)
Record the signal.
3)
Remove
the input signal, and adjust the input/output
switchover switch to [out].
4)
Playback the recorded section.
5)
Check that the 400 Hz signal level of the audio output
terminal (left) [right] is -8.5 + 2 dBs, and that the distortion
rate is below 0.8% (Note 2).
— 256 —
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