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Audio level meter or
distortion meter
10-7-1,
IR Adjustment (VA-68 Board)
Playback
Audio
oscillator
Attenuator
Alignment tape: for
AFM _ stereo
operation
check
Signal
(WRS-9NS)
Bilingual (monoscope) section
Measurement Point
1. Pin © and @ of IC400
2. Pin © and @ of IC402
Connect for
recording
Connect for
Measuring Instrument | Digital voltmeter
playback
1, RV400 (1.5IR)
When connecting input and output devices at the same
1)
time, set the IN/OUT select switch to the OUT position and
connect the audio level meter or distortion meter to the
2
AUDIO IN/OUT terminal.
)
For connection of the audio oscillator/attenuator, refer to the
3)
diagram below.
$201 IN/OUT selector
4)
faced
5)
6)
VA-68 board
Audio oscillator/,
Attenuator
:
[Adjustment procedure]
1) IR adjustment
2) 1.5 MHz carrier frequency check
3) 1.7 MHz carrier frequency check
4) 1.5 MHz recording level adjustment
5) 1.7 MHz recording level adjustment
6) E-E output level check
7) REC matrix L-R adjustment
.8) REC matrix L+R check
9) 1.5 MHz deviation adjustment
10) 1.7 MHz deviation adjustment
11) PB matrix adjustment
12) Overall level characteristics, separation check
13) Overall distortion check
14) Overall noise level check
Fig. 10-25.
— 304 —
© 1.51
adjustment
Connect the digital voltmeter to Pin @ of IC400 and read
the DC voltage level. (Approx. 2100 mVde)
Connect the digital voltmeter to Pin © of IC400.
Adjust RV400 so that the voltage level at Pin © of IC400
becomes the same as Pin @ of IC400. (Tolerance level=
+ 10 mVdc)
© 17 IR adjustment
Connect the digital voltmeter to Pin @ of 1C404 and read
the DC voltage level. (Approx. 2100 mVdc)
Connect the digital voltmeter to Pin © of 1C404.
Adjust RV404 so that the voltage level at Pin © of IC404
becomes the same as Pin @ of IC404. (Tolerance level=
+ 10 mVdc)
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