CleanRGB Install (Master System)

the master system already outputs rgb out of the av port, however it has a dc offset which makes it incorrect voltage levels to most monitors most people solve this with making custom rgb cables with ac coupling capacitors and resistors this is ok, but it's far from perfect it introduces all problems that ac capacitors add (field droop, tilt, common mode noise coupling from the receiver side and more all the rgb mods i personally make are called the cleanrgb it aims at correctly fixing the console itself to output ire correct voltage level and signals, and the cable is then a pure dc cable with direct connections, no hidden capacitors, sync strippers, resistor or other magic the benefits of this are pure, perfect rgb signals not affected by your cable, receiver, or noise overview this install will involve getting rgb and sync inputs from cxa1145 to cleanrgb severing traces from cxa1145 rgb and sync outputs to av port wiring rgb and sync outputs from cleanrgb back to av port tuning the cleanrgb for perfect ire levels wiring rgbs inputs start by installing a cleanrgb universal board into the master system tap the rgb and sync inputs directly from the cxa1145 the r, g and b in go to the cleanrgb inputs, and we tap 5v from the cxa pin 19 and ground from the nearby ground disconnect av port from cxa next, we need to disconnect the av port from the existing connection to the cxa1145 the r, g and b output pins usually travel in a set right by the output pins test continuity to confirm or follow visually on this revision you can see them here and severing them all is easy finally, we need to do the same for the csync pin 10 (it uses the csync in not out pin) of the cxa1145 to the csync pin of the av port connect cleanrgb output now wire up the rgb and sync outputs to the av port pins tuning cleanrgb checkout the setup guide for tuning the cleanrgb, or for quickness set your dials to the following positions and then tune by eye results using our cleanrgb scart cable, here are the results on a master system