Roland FA-76 Problem!! - diyAudio
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Old 7th February 2012, 01:06 AM   #1
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Default Roland FA-76 Problem!!

hi guys, i need your help, my keyboard doesn't have output sound anymore and i have check on it and found 5 capacitors in this area are blowned, i replaced this caps but still without output. I dont know if the Opamps are working, anyone have ths service manual for this model?? or just the output area schematic?? this is my email: email removed tp protect against spam. Please PM

greetings from TJ

Last edited by wintermute; 7th February 2012 at 01:18 AM. Reason: remove email address.
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Old 7th February 2012, 06:55 AM   #2
Enzo is offline Enzo  United States
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I have no schematic, but even without it, look for the power supplies. The analog section should have op amp ICs rinning on probably +15v and -15v, or possible a pair of 12v supplies. Look at the power supplu p[ind of the op amps near the output jacks. Or for that matter ANY op amps in the unit. Are both power supply pins powered?

I can;t see your unit, but when a bunch of caps are blown apart, usually it either means power supply failure, or it means someone plugged something into the output jack that had voltage on it, like for example the output of a power amp, or even just something not grounded to the mains.
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Old 7th February 2012, 07:26 PM   #3
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Enzo thanks for your time, i checked the voltage in the output area, looks like the voltage is not the problem i have +/-15V in pin 4-8 (ic 5532 opamp), but i dont find signal in the output pins (1 and 7) thats why i need the schematic, i need to know from where the sound comes and follows the signal and see where it gets lost, because i have the signal in the fiber optic output, looks like the sound card its working good, any advice??? or maybe i just need to change the ic 5532, can i replace them for a ic 4580???
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Old 7th February 2012, 11:38 PM   #4
Enzo is offline Enzo  United States
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I have no knowledge of this product, but in genera, if the power supply is there, connect the unit to an amp and touch the input pins of the output op amp. Use a small screwdriver or a piece of wire. This should inject some hum, which you would hear if the stage was working.

DOn;t overlook simple things like failed volume slider. After jack solder, that is one of the most common causes of lost output on keyboards in my experience.

Can Roland provide the schematics?
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Old 20th February 2012, 07:18 PM   #5
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Enzo, follow your instructions and found that the audio signal comes in to volume slider but doesnt come out, looks like you was right, just replaced the volume slider and now it works pretty good.. thank you VERY much!
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