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The Service Manual received was helpful. The electronic information is exactly what I needed.
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High quality scan of service manual. I am satisfied!
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Excellent copies.
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Very good manual for Technics SL 303. Manuale molto utile.
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About one hour after checkout, the manual was available for download. Clear reading and detailed. Thanks
CX-977
Fig. 5: RFRP and RFCT circuit
5) SBAD Signal Circuit unit
In this unit, outputs from the photo detector, namely, E and F are processed through the addition amplifier. That is, E and F are added together and (E+F) signal is output from #15 pin of IC101 (TA2153FN), as SBAD signal. This SBAD signal, along with Focus Error signal, is used as one of the conditions that the system uses to internally judge Focus ON/OFF based on them. Also, SBAD signal is used to detect defects: defects that may be detected when the Pickup passes a scratch on the disk, for instance.
Fig. 6: SBAD circuit
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