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Roland FP-8 Resurrection
#2964767 04/08/20 04:29 PM
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My parent's church gave me their dying Roland FP-8 instead of tossing it in the garbage (score!).

I'm somewhat handy and know my way around a multimeter and circuit board...for the most part anyway - I'm always learning though!

When they gave me this keyboard (which I think is circa 1991?), it would turn on, operate for a while (variable amount of time), and then shut down - lights, sound, everything would just turn off.

Now it won't even give power to any of the lights when I switch it on. I have tested the switch and it seems to be operating correctly (tested the continuity for both positions).

I have found a replacement power supply online (keyboard kuntry) but I wanted to check with y'all before I pour money & effort into this instrument.


Do I have a power supply issue? Any suggestions?


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Re: Roland FP-8 Resurrection
ScubaCamper #2964770 04/08/20 04:41 PM
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Without seeing it, first guess is power supply failed, maybe the caps. Sometimes you can see they leaked or swelled. Sometimes you can tell only by testing. Make sure to unplug from mains and discharge the caps as they can zing.

Possible fuse blew. But just replacing that doesn't get to the cause of the problem.

You can find a service manual online. There is a hardcopy for sale on reverb.com for $10.

Re: Roland FP-8 Resurrection
newer player #2964771 04/08/20 04:46 PM
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Originally Posted by newer player
Without seeing it, first guess is power supply failed, maybe the caps. Sometimes you can see they leaked or swelled. Sometimes you can tell only by testing. Make sure to unplug from mains and discharge the caps as they can zing.

Possible fuse blew. But just replacing that doesn't get to the cause of the problem.

You can find a service manual online. There is a hardcopy for sale on reverb.com for $10.

Thanks for the quick reply!

Cylinder caps all LOOK normal (will test) - I did blow a fuse checking the outputs from the transformer (shorted a circuit with my leads - oops!) - new fuse, still no dice.

Manual - that's kind of funny - the FP-8 manual has been very difficult to locate; I'll give reverb a try though!


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Re: Roland FP-8 Resurrection
ScubaCamper #2964778 04/08/20 05:13 PM
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Originally Posted by ScubaCamper
I did blow a fuse checking the outputs from the transformer (shorted a circuit with my leads - oops!)
Glad you are ok. Be triple extra careful with mains power as that easily kills. There are some good safety videos online to review.

Hopefully the fuse mitigated any issues.

Old caps can fail over time without leaking or swelling. Most reliable testing is out of circuit. But before removing them do some more troubleshooting with the manual. You can start with the tips below.

Disconnect mains.

You can visually look at all the boards and components with a loop and bright light. Look for any burn marks, deformed bits, corrosion (typically white or green), or anything that looks out of place.

Check all connectors are seated properly.

Re: Roland FP-8 Resurrection
ScubaCamper #2965073 04/09/20 02:33 PM
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There is an online digital piano salvage yard whose name I forget. A google search, such as “used roland digital piano parts” should locate it easily.

The site has both salvaged parts and out of production new parts. They seem to specialize in Roland.

Before throwing money down this hole, open the piano up and inspect the counter weights just under the keys. These pianos were notorious for breaking the counter weights due to a seemingly poor design. On many of these older Rolands neither used or new replacement parts can be found anywhere on this planet.

The name of the salvage company might be “Centaur” or similar.


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Re: Roland FP-8 Resurrection
Ralphiano #2965098 04/09/20 03:04 PM
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Looks like it's www.Syntaur.com

No dice on the power supply.

They keys are all in good shape - seriously, this thing was babied by old ladies smile lol


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Re: Roland FP-8 Resurrection
newer player #2966784 04/14/20 09:25 AM
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Power supply replaced - still no power to the LED display. I do hear a slight little 'pop' in the speakers, which seems to indicate the speakers/amp are getting power but perhaps the portion that processes the sounds is at fault....(?)


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Re: Roland FP-8 Resurrection
ScubaCamper #2966786 04/14/20 09:31 AM
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Is this a external power supply ?

Maybe there is some DC-DC converters at fault. You're best bet is to check all the electrolytic capacitors.

Last edited by Serge88; 04/14/20 09:34 AM.


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Re: Roland FP-8 Resurrection
Serge88 #2966807 04/14/20 10:53 AM
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Originally Posted by Serge88
Is this a external power supply ?

Maybe there is some DC-DC converters at fault. You're best bet is to check all the electrolytic capacitors.
Sorry for the confusion - not power "supply" - power board, technically.


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Re: Roland FP-8 Resurrection
ScubaCamper #2969119 04/20/20 08:38 AM
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Update:
I took out the main board to test the capacitors and found several showing approximately double the capacitance stated on the can.

I would post a picture but this site won’t let me without posting it somewhere else smirk


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Re: Roland FP-8 Resurrection
ScubaCamper #2969135 04/20/20 09:09 AM
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It's not unusual for electrolytic capacitors to show capacity higher than rated. That's because the specs are (sometimes) +80% / -20%. Given the way they're used a bit more is better (usually).

It might be wise to also check three other things:

1. The capacitor maker / brand. Go online to find out which brands are good and which are crap. Easy to do.
If yours are crap branded, replace them.
I can't remember the good names and bad names, nor the good logos and bad logos. So you'll have to check for yourself.
But the goog is always there to help.

2. Is there any expansion on the top or bottom of the can? If so ... defective. If not ...

3. Can you check the leakage? That's electrical leakage, not liquid leakage.
Electrolytics always leak a little. But too much leakage is a call for replacement.
Unfortunately you need equipment for this. Does your capacitor checker have a leak test option?

Re: Roland FP-8 Resurrection
ScubaCamper #2972718 04/28/20 04:17 PM
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1. the caps I got (From Mouser.com) were all Nichicon. I've installed most of them on the main board (not all though - ordered the wrong ones and now have to wait for the rest to come).
2. No visible signs of cap failure (no bulging, expansion, etc) - no burn marks, but it does appear the caps have been replaced at some point.
3. Checking power leakage: I have a Fluke 110 and a Fluke 324 but sadly, no other test equipment. smirk

As I observe the issues this keyboard is having, I can't help but be frustrated with my lack of knowledge of how it works. Can someone give me a brief process "map" of how this digital keyboard works?
Here is what I know so far (of course, correct me where I'm mistaken): It gets AC power and the power board transforms it into DC, sending it to the other PCB's.

Where I get fuzzy is which board does what, and in what order.

I'm guessing the Main Board is what processes the signals from the synth and keys and sends it to the "amp" board to provide the speakers & line out with usable signals.


When I turn on the keyboard, the 4-digit LED display tries to begin it's bootup sequence ("FP-8") but only gets to the point of flashing the letter "F" before failing. If I lean down toward one of the speakers, I can hear a slight hum. This tells me the "amp" board is getting SOMEthing, and therefore the issue must be earlier in the "assembly" line.

The board with the LCD display must not be getting adequate power as it does not light up. Is this a problem with that board, or another board?


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Re: Roland FP-8 Resurrection
ScubaCamper #2973699 05/01/20 01:22 PM
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I decided to run some in-circuit tests on the resistors and capacitors on the original power board. A few caps failed to measure within their stated thresholds (one even measure WAY out of spec (rated for 10uF, measured 3k+ uF)). There were 6 resistors which failed to measure within their stated thresholds: 2 failed up (above threshold), 4 failed down (below threshold)

Several articles I've come across online seem to indicate failing down is not big deal for resistors but failing up is (?).

None of the above mentioned components have any visual damage (burns, swells, cracks, etc...).


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Re: Roland FP-8 Resurrection
ScubaCamper #2978213 05/12/20 10:53 AM
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I have replaced all caps on the main board.

I have replaced the AC Power Switch.

At this point, the unit will not power on but when power is supplied, an offensive smell (similar to what I imagine the red light district late at night, or a previously occupied hourly-rate motel room might smell like) emanates from the jack board.

I have read online that funny smells from electronics typically indicate aging glue/adhesives and/or wire casings heating up and/or breaking down.

My guess is the next step is to closely evaluate the jack board for defects; anyone agree?

Could the jack board be preventing the keyboard from powering up?


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Re: Roland FP-8 Resurrection
ScubaCamper #2978312 05/12/20 03:51 PM
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Are you measuring the resistors and capacitors in circuit ? Because you are also measuring all the other components that are connected to the resistors so the value you read mean nothing, you don't have the schematics. Usually resistors keep their value forever, they are never defective excerpt for low value resistors that can get hot and burn.

The first thing is to make sure the power supply provide voltage and the reading you measure is right.



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Re: Roland FP-8 Resurrection
Serge88 #2978741 05/13/20 05:25 PM
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Originally Posted by Serge88
Are you measuring the resistors and capacitors in circuit ? Because you are also measuring all the other components that are connected to the resistors so the value you read mean nothing, you don't have the schematics. Usually resistors keep their value forever, they are never defective excerpt for low value resistors that can get hot and burn.

The first thing is to make sure the power supply provide voltage and the reading you measure is right.
Thanks for the direction and tips!
Can you walk me through the proper procedure in checking output voltages for the transformer? It looks like there might be 3 sets of terminals on the output side: The first set with 3 leads (all have continuity with each other), the 2nd set having 2 leads, and a 3rd set with 2 leads.

On the first set, would the center lead be the "center post"?


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Re: Roland FP-8 Resurrection
ScubaCamper #2979950 05/16/20 02:28 PM
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I re-read the thread and power supply has been change so this is not the problem But you said it smell like something is burning. That’s a problem, use your nose and find it . It could be a defective component.



“To send light into the darkness of men’s hearts - such is the duty of the artist.”
- Robert Schumann


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