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This is probably some generic 2x16 LCD display with integrated controller, You just have to find a compatible model. I removed also the sliding keyboard lid - just unscrewed another two screws (they limit the lid movement).įront panel is still in place but it's just another set of few screws.īut if the LCD has dead pixels then I'm afraid the only way is to replace the display. Then the cover can be lifted up and that's all. The top cover has only 4 screws on the back and then You have to slide it a bit forward to release two "locks" on both sides (just 2 another screws, which are going into some keyhole shaped cuts) and some others on the back. Was it fairly simple to open yours and have the view that you show in your first picture? English is not my mother tongue, so forgive me any errors. Now I have to clean my GEM and make some minor mechanical repairs. Probably I'll put a coin lithium battery for RAM data retention. When the GEM lighted up the LCD and displayed * REALPIANO * RP90 I was very happyĬhecked the keys, played the demos, everything works now. I ordered two new RAM chips (~4$ total), yesterday night replaced them, today put the board back inside the piano and switched it on. Then I thought, maybe the RAM was short-circuited by the battery leak. Soldered everything back - still doesn't work. One trace was broken and needed repair.įlash was intact, with all the program inside. I unsoldered the 3 ICs, checked and cleaned the board. The most damaged area was near the battery connectors - RAM and Flash IC connections.
Baldwin pianovelle ps2500 dimensions serial#
The PCB has place probably for second DSP (bigger polyphony models?) and additional wave memory.Īnd to my surprise, the keybed has it's own uC communicating over some sort of serial connection (maybe something like MIDI, but inside the instrument).
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The sound is generated by the GEM proprietary DSP chip with wave ROM and DAC chip. Turns out, the RP90's mainboard (and probably other RP's by GEM, and some GEM-made Baldwin Pianovelle too) is powered by Hitachi H8/3003 micro-controller with a Flash EEPROM and 2 static RAM chips. In meantime learned to solder and unsolder SMD elements using some unconventional homemade tools Removed the battery (it looked new, apparently someone already tried to repair the piano). I examined the board - some traces around the battery were slightly eaten by the electrolyte, also some connections between traces and SMD IC pins. Like the CPU hanged in the middle of startup. Power on caused only a row of grey bars on the LCD and lit a set of 8 LEDs. Maybe to salvage the keybed in some hobby project.īut I thought "I have to dust off my electronics knowledge and check this board first". I bought it almost for fun, a big paperweight. Battery leak.Īs I learned later, it was a common failure in Generalmusic products - leaked battery caused failure of CPU board.
Baldwin pianovelle ps2500 dimensions full size#
Somehow I always wanted a piano to learn & play but never got to buy one, actually.īut some weeks ago I was browsing online local ads and found a "digital piano" for 50$.Īt first I thought that it must be only some cheap keyboard but it turned out to be a full size GEM RP90, big, black and broken. I'm Michael, from Poland, Europe, turned 44 this year. This is my first post here, so I'll introduce myself.