Sony EVO-720P - Page 262

9, Overall distortion check . %
Mode Self-recording and playback
1 kHz, —0 dBs : Recorder
audio input termina! L [RI]
Pin © of CN0O3 on MB-9P
board {Pin ©]
Distortion meter i
Less than 0.35% *} |
Signal
Measurement ‘Point
Measuring Instrument
Specified Value
When checking the player side; use a tape
recorded on the recorder side,
Note :
Checking method :
1) Record the, signal,
2) Playback the recorded section.
8) Confirm that the distortion rate is less than
0.35% #1,
«1 Value during using a 30 kHz LPF,
10, Overall noise level check
Self-recording and playback
fon-signal
(Insert shorting plugs into
the recorder audioinput
terminals L_and_R.)
; Pin © of CNO03 on MB-9P
board (Pin 6)
Measuring Instrument } Audio level meter
Specified Value Less than —85 dBs *?
Note: When checking the player side, use a tape
recorded on the recorder side.
Signal
Checking method :
1) Record the signal,
2) Playback the recorded section.
3) Confirm that noise level is less than —85 dBs «2
«2 Value during using an IHF-A_ listening
sensitivity correction filter,
8-5-2. AFM Audio System Adjustment
Notes: !) Input the audio signal to both L and R
audio input terminals of the recorder
simultaneously,
2) Set switches to the following positions
for adjustment,
* Monitor audio output select switch
ven vie ooStandard
¢ Player audio output select switch
fae ‘Standard
+ Recorder. input select switch +++ EXT.
1, AFM carrier frequency. check (HK-3 board)
Mode Playback |
Signal Non-signal
Measurement Point Pin @-of IC801 ”*
Measuring Instrument
Specified Value
Frequency counter
1,500+0.002 MHz
Checking method : :
1) Turn the audio oscillator output OFF.
2). Confirm the reading on frequency counter becomes
1.500 #0.002 MHz. :
2. AFM deviation’ check (HK-3 board)
Playback
Alignment tape:
For operation confirmation
(WRS-SCSP)
| Pin @ of CN103
Measuring Instrument | Audio level meter
Specified Value —10+1,0 dBs
Signal
Measurement Point
Checking method :
1) Confirm the. reading on audio level meter becomes
—10 +1.0 dBs.
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