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The hum is likely to be the sound of the ac mains electricity, either because the power supply smoothing has become ineffective in the amplifier or one or more of the audio peripherals or because the audio connections to the input of the amplifier have created a hum loop that is picking up the radiated energy from the mains supply and feeding it into the audio input.
Multiple grounding is often the reason for a hum loop. This is where an audio peripheral is not only grounded through the supply cable but is also grounded through the screened audio lead.
If the hum persists when there is no inputs connected the problem is almost certainly power supply related, otherwise it is likely to be a peripheral that has a faulty power supply or the culprit is a hum loop.
Hi-fi officianados have a number of tricks to deal with hum loops and google could lead you to these.
Grounding is an important safety consideration so appliances that are intended to be grounded must continue to be grounded but the loop could be broken by using special audio leads. The usual lead would use the screening as a conductor and so the screen must be connected both to the peripheral and to the amplifier.
A better lead uses an extra core conductor and the screen then becomes just a screen and is grounded only at the amplifier end and is not connected to the peripheral.
You can try this. STEP 1: Set Program protect and Combi Protect to OFF. - GLOBAL - Using PAGE+ or PAGE-, find untill the display show "3A-MEMORY PROTECT". Set the parameter to OFF by using YES or NO button. STEP 2: Data Load. - GLOBAL. - Using PAGE+ or PAGE-, find untill the display show "05A-PRESET DATA". Change ALL to PRG (your case). Use Left/Right Arrow button to moving cursor. Choose "PRE-a" (your case). Move cursor to "OK?". Press YES when "OK" blinking for confirm. Exit (Go to PROG button).
The display is usually held against the circuit board with 2 or more strips of multiconductor rubber. it may just need the clamping tabs tweeked to make a more secure contact. If the drum set fell, it could have shifted the circuit board in relation to the display. Parience and careful observation will allow you open it up and make that tweek.
I had similar problem with my DGX620. In my case the display sometimes got blue and sometimes worked fine. The cause was a bad contact of the display flat cable.
I opened the DGX620 and then I cut a small piece of plastic film (35mm negative) with exactly the same width of the flat, disconnect the flat cable and then reconnected it using the film on the other side (non contact side) to increase the pressure and guarantee a good contact. No more problems from nov-2012 till now.
Mine and a whole lot of others did the same thing with the SD9K Simmons kit. I called Simmons, they sent me a new power cord...that obviously didn't work. Then they said to wait on a new drum module...that never came. It's been 2 years and now they say they have no records of ever talking to me or sending me the power cord!!! Horrible product, horrible customer service. Whatever you do...don't put any more money into Simmons...only go with Roland!! Trust me on this one!! Me and about 3 others I know waisted $900 on Simmons and we are all paying the price now. So, to answer your question, you need to buy a $300-$400 new module!! Ridiculous!
Hi, I don't know if you still need this information but here's a button by button guide that I've done. I've got an E-70 myself. Now if I can only find that **** internal battery that stores all my sounds I'd be laughing.
Press Menu (the button on the right underneath the light-up display), make sure the arrows are highlighted around the 'Param' setting and if not, turn the jog dial anti-clockwise to get the arrows there. Press Enter and then on next screen press Enter 5 times to see the Transpose display flash and use the jog dial to change from -11 semitones to +11 semitones and press Enter or backup to come out of this screen. Now, whenever you press the Transpose button (the grey button on the bottom right-5th button in from the right), the keyboard will automatically change. You can store different sounds in different keys, so for example I used to play Knocking On Heaven's Door and had this lovely riff when I played in G but it didn't sound the same if I played it in A so I transposed it to play and performed live in A while playing it in G. As long as you what presets you use for different songs, it's quite easy to get used to.
If you haven't had a response or sorted it out yet, I hope this helps.