Sansui au-719 repair manual

Sansui AU-719 Full Restoration - YouTube

Turned out the preset for the quiescent was open so the outputs were being turned fully on. I used TIP41\42 as replacements and set the bias preset to 470 ohm.

Sansui Service Manuals

Replaced both presets 100 ohm worked fine, replaced several capacitors on the driver and PSU boards while I had it in bits! I also replaced the driver transistors and one of the temp sense transistors by using a BC182L.

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Sansui Amplifier Repairs - PR Audio

It also needed the panel lhts replacing 8V 300m A.All the 470 µF & 100 µF 50 V capacitors on the power amp and PSU were also replaced.

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The speaker relay was switching on-off, I eventually found that four 220 ohm fusible resistors were open circuit and 6.8 ohm resistors in the o\p section were hh.

Sansui au-719 repair manual:

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