Sony CCD-F35 Service Manual page 184

9-5. AUDIO SYSTEM ADJUSTMENT
Perform adjustment with the color bar signal used as the video
input signal.
[Connection of audio measuring instruments]
In addition to the video system measuring instruments, connect
the audio system measuiring instruments as shown in the figure
below, and set the power switch to the video position for
adjustmeni.
Audio level meteror
'Audio distortion meter at
oscillator
Attenuator
Audio input terminal
Main unit
Audio output terminal
Fig. 9-23.
9-5-1. AFM Carrler Frequency Check (CO-2 Board)
9-5-2. REC AFM Carrier Level Adjustment
(CO-2 Board)
Mode
Recording
Signal Non-signal
Measurement Point __| Pin @ of IC401 (REC AFM)
Measuring Instrument | Oscilloscope
Specified Value 160 + 5 mVp-p
Checking method:
1) Confirm that the level is 160 + 5 mVp-p.
Center of luminescent line width
T
160 + 5 mVp-p
4
Center of luminescent line width
+
Approx. 0.67 ps.
Fig. 9-24. REC AFM recording current adjustment
9-5-3. Playback Level Check
Alignment tape:
Operation checking (WR5-SNSP)
Audio output terminal
Signal
Measurement Point
Recording Measuring Instrument | Audio level meter
Non-signal Specified Value ~7.5+2dBs
Measurement Point Pin @ of IC401(REC AFM)
at Checking method:
Measuring Instrument
'Specified Value
Frequency counter
1.50 + 0.01 MHz
Note: Connect the frequency counter through a buffer amplifier
(oscilloscope, etc.) having high impedance and low
capacitance.
Checking method:
1) Tum OFF the audio oscillator output.
2) Confirm that the AFM carrier frequency is 150 + 0.01
MHz.
1) Confirm that the audio output level is -7.5 + 2 dBs.
9-5-4. E-E Output Level Check
400 Hz, -7.5 dBs
Audio output terminal
Audio level meter
-7.5 +2 dBs
Measurement Point
Measuring Instrument
Specified Value
Checking method:
1) Make sure that the audio output level is -7.5 + 2 dBs.
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