Question about Roland Digital Piano FP4 Black With Stand 4139

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I have a Roland FP-8 that I used for performances. I have noticed some static in the past couple of weeks in the sound. Now it doesn't play at all. The display lights up normal, and the buttons work and light up, but no sound from any function. I even tried a 'reset' of it and that doesn't help. Occasionally the sounds come back, then go again.

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  • All these go without saying. Since this malfunction occurred to at least two more owners trying to find answers, ,maybe we already had spotted the component under suspicion,like the two capacitors at the signal exit from the main board responsible for loss of volume at the monitors. .I have changed all the capacitors i could find since then,but now it feels like mainboard problem because the preamp works. Can i find a new motherboard? thanks

  • i have not yet put the advise i received to the test, nevertheless i appreciate the attention of my adviser, and hope for the best. consider the solution as accepted, thank you

  • Thank you my friend , i will do as advised. I miss my piano terribly, although i am a sax player. If you come by a new mainboard for the fp8, just notify, nevertheless. geras.anas@gmail.com

  • I did all that and the mainboard thankfully is working. The problem seems to be at the swichboard in one ic before the volume sliders. I will get someone to check all the capacitors and resistors around , (just a dozen or so of them). If the ic is burned ( an elongated one with one row of ten pins that gets audio signal but gives nothing to the sliders) i will have trouble since it has nothing written on it. After the check of the surroundings i will know more. Thanks again.

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You have some internal components bad audio output IC, capacitors, driver transistors etc. your doing nothing wrong.

maybe just don't leave it on if your not playing it. Heat kills Electronics.

Posted on Jan 01, 2011

  • Ron Lyda Jan 02, 2011

    do you have a o scope to see the sound. if not it sounds like you are the tech type. so if you don't have a o-scope you can use anything with a mic input that works. for a probe to hear sound you can use a old cord with the right end on it and just put a small cap 10uf 25v electrolytic in line with the center or positive side and connect the ground in the circuit your checking in. probe around with the Positive lead of the cap, the pin is small just be careful not to short anything out.
    this is what i do. even though i have 5 scopes in the shop. a simple item can be used in the road or in the shop to test with.this can be used to see if the main board has sound coming out of it.

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I have a Roland FP-8 that I used for performances. I have noticed some static in the past couple of weeks in the sound. Now it doesn't play at all. The display lights up normal, and the buttons work and...


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What causes the static background noise in my keyboard?


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It sounds as though you have a static electricity problem in your volume pot. Although there are sprays on the market that you can use for all of the electrical switches on your keyboard which removes and suppresses static electricity, one way to make sure this is the problem is to slide your volume slider to maximum, then minimum, up and down about 10 to 20 times, if the scratchy sound begins to diminish, you knwo the problem lies there. As a matter of fact, if you do it long enough, the sound may go away altogether, although without a good spray of electronics cleaner or electrical contact cleaner (which you can find at stores like home depot or online, even eBay), the sound will return.

If this is not the case, and the scratchy static sound does not go away or depreciate, it could be your cords or even static on the pc board inside the unit. If you are confident that you can crack the case on your board without causign damage, then get a screwdriver and open the case (all screws are located on teh bottom of the unit) and give it a good spraying with electrical contact cleaner on all of the contacts and even a once over on all of the circuit boards. Do not wet the circuit boards with too much spray, rather, give them a light misting.

For areas where you plug in, like your 1/4 inputs, your midi ins and outs, and headphone jack, spray the contact cleaner inside the holes. You don't have to worry about spraying too much in these areas. Just do not oversaturate.

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