We very often get enquiries about fixing hum problems and 90% of the time there is no fault with the synth.You should remove it from your setup and ideally take it to another premises. Remove the mains earth in the plug(THIS IS FOR TESTING PURPOSES ONLY AND YOU MUST REPLACE THE EARTH FOR SAFETY REASONS AFTERWARDS) Plug in a pair of headphones or a battery powered amp. If the hum disappears the problem is in your setup.
Usually (but not always) hum faults within the synth tend to be a low sine wave type sound whereas earth hum is a rougher more familiar sound.
This is usually but not always the battery. We can replace this and reload the factory sounds. If however the synth will not store and recall sounds even when turned on it's something else. Some later machines allow you to recover the factory presets from Rom with a startup key combination.
The best way to prevent many problems is to play the machine regularly ! Key triggering issues, noisy pots and other issues are all much more common with instruments that have been left standing. If your synth has NIcad or AA type batteries these should be removed before storing for long periods. Gigging vintage instruments is a risky business and although it will likely be fine we can't really recommend it. If your synth is 110v put a prominent label on the front stating that fact
Again 90% of problems are in the setup and not the machine. Read the manual very carefully.Check the Midi with a MIDI keyboard plugged directly into your instrument.Remove all other leads boxes etc. Make sure your synth is connected to the right MIDI channel and is not in omni mode. Check you have a MIDI lead wired correctly. With din sync make sure the sync switches are set correctly. Note that some MIDI leads will not work as din sync leads. All the pins must be connected.
Builth Wells LD2
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