I had an AV-9000 for a short period of time but didn't become intimate with the internals. Having said that, this is strictly a guess.
Many devices that use digital processing make use of a "memory battery". These are used so as to store specific user adjusted settings should power become interrupted. Without this battery, the unit reverts back to factory default when power is removed, which is what you describe. As such, you might want to look through the manual, contact Marantz or talk to a Marantz dealer about this. If they sell the product, they should be familiar with the needs of it over a period of time.
With the above in mind, some cheap units use a capacitor to act as a storage cell for temporary outages. It is possible that the capacitor is too small or your unit is being left in the "on" position for longer than it can supply reserve power for once power does go down. It's also possible that the cap itself has gone bad.
Several variables here that you might find answered in your manual or by Marantz. If they are of no help, you could modify the unit to include a memory back-up battery. One would need a full schematic of this unit to do that though. Sean
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Many devices that use digital processing make use of a "memory battery". These are used so as to store specific user adjusted settings should power become interrupted. Without this battery, the unit reverts back to factory default when power is removed, which is what you describe. As such, you might want to look through the manual, contact Marantz or talk to a Marantz dealer about this. If they sell the product, they should be familiar with the needs of it over a period of time.
With the above in mind, some cheap units use a capacitor to act as a storage cell for temporary outages. It is possible that the capacitor is too small or your unit is being left in the "on" position for longer than it can supply reserve power for once power does go down. It's also possible that the cap itself has gone bad.
Several variables here that you might find answered in your manual or by Marantz. If they are of no help, you could modify the unit to include a memory back-up battery. One would need a full schematic of this unit to do that though. Sean
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