I replaced some broken hammers for some keys on my Roland Rd-500 digital piano...I took it apart more than I had to....detached the ribbons to the PCB board...etc... now it.has no sound....the factory demo works but no sound when I play the keys....what did I do wrong?
You either did not get the ribbon cable seated OR got it upside down.
If this cable is the flat ribbon with exposed solder plated points of contact, OFTEN those connectors have a latch to release by GENTLY moving tabs on eaither side in the direction of pulling the cable out. This lock MUST be moved out slightly to allow the cable to seat properly. The solder plated contacts will be FULLY into the connector when seated properly.
These cables ALSO can be inserted backwards and NO connection will be made.
The latch are on MOST of that type connector and are little ears that extend a small distance from the sides. They slide back and then the cable is put in and held and then the latch thing slides and wedges the cable against the contacts. I tried to find a picture of this but was unable to.
Usually these cables will go into the connector either way and it can be very confusing which direction is correct.
Use a bright focused light to verify which side the contacts of the connector are on... they contact the exposed portion of the ribbon about halfway up the exposed part.
ALSO verify that the other end of the cable has not come loose if it is also in a connector. Some have a soldered in header and not really a connector at one end.
These things are a pain to handle the heavy parts while fighting the connectors.
One other thing is that often there is a second power cable and I have in the past thought all was together but missed putting another cable on and of course things don't work that way.
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Thanks for the feedback fredy2!....I don't see the release latch that you are refering to concerning the flat ribbon cable....there is a slot that the ribbon cable slides into...you have to rock the cable gently as you push it ...to remove or insert it in the slot...when inserted the exposed solder plated points of contact can still be seen....they don't seem to go in all the way....about 1/16" of it is still exposed....should it go all the way into the slot for a good connection...is that what you are saying?
Thanks again for you help!
Thanks for the feedback fredy2....I still can't get it to work...no sound! I don't see the LATCH you are refering to...just the slots that the ribbon slides into...there is about 1/16" of the solder plated point of contact on the ribbon that is exposed...it won't go all the way into the slot...I tried rocking it gently from side to side..to no avail!...any suggestions?
...thanks again for your help?
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