tu-s707x_outline

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AM-FM Stereo Tuner TU-S707X ( Sansui )

[Outline] [Front view] [Inside view] [Trouble-shoots]

Fig.1 TU-S707X

[Features]

4 DBMs ( MC1496 ) are used for stereo demodulator cirquit.
----> Sansui called this cuicuit as SLDD
THD=0.015% @1kHz Stereo
IF width selector is avalable in FM and AM band.
Pre-set emories are backuped by a litium battery.

[Trouble Shoots]

Trouble Cause Repair

No FM sensitvity. The capactance of a trimmer capacitor of the 1st L.O. tunk circuit is decreased out. Replaced the trimmer capacitor.

Memories were all disapeared
in a week. Increased Leakage current of a chemical capacitor attatched to the backup battery. Replaced the chemical capacitor to a film capacitor.

Trouble	Cause	Repair
No FM sensitvity.	The capactance of a trimmer capacitor of the 1st L.O. tunk circuit is decreased out.	Replaced the trimmer capacitor.
Memories were all disapeared in a week.	Increased Leakage current of a chemical capacitor attatched to the backup battery.	Replaced the chemical capacitor to a film capacitor.