Hi everyone,
I’m troubleshooting a Roland E-30 (Intelligent Synthesizer, circa 1988) with a “backlight only” symptom - LCD backlight turns on but no boot sequence occurs
-All power rails verified (+5V, +13V, ±9V all correct)
-CPU (MC68HC11A0P) tested - functional
-RAM (IC5 - HM62256LP) verified working
-Clock signal present and stable
-CK-36 rhythm board disconnected - same symptom
When I remove IC4 (TMS27C128 main program EPROM) from its socket, the panel LEDs start flashing randomly. This confirms the CPU is executing instructions, just not the correct ones
I need a reference dump of from a working Roland E-30 to compare against mine. I have a programmer and can read/write EPROMs myself
I suspect the firmware may be corrupted - IC4 (TMS27C128, 16KB), but I cannot find this dump anywhere online - only the E-20 version is available. Would anyone be kind enough to share it with me, or perhaps read it from a working instrument?
Best regards