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studer a807

Studer A807 Mk 1 Software 30/88

Machine had fault were 50 V fuse kept blowing. I think that was loose reel turntable causing the Reel drive to crossbar the supply, whenever it got out of step. That sorted, but now unable to align the Audio.
Unable to get any change in adjustment parameters in Level, hf for Repro Sync and record. All speed, All eq.
BUT can control bias level.
It was storing tape position. ( Latest test, seem to indicate that no that is not happening, but unsure about the reliability of this test).
My fear is that it a faulty MCM2802. eeprom chip.

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