hi guys, let me start by saying that I really have zero knowledge of Apple III, I bought an Apple III and replaced all the capacitors on the power supply, the machine turns on and the word retry appears, if I try to detach the keyboard it loops in a diagnostic ram (I don't know if it's normal), seeing some videos however by pressing ctrl + apple open an arrow appears and then I can write, I tried to press the same combination too and the arrow appears and you hear a beep but it doesn't allow me to write anything, it's a malfunction I assume, does anyone have any suggestions?
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Retry means it didn't find a boot disk. Does the internal drive spin/seek at power on? The -> (arrow) means you got into the monitor. You should be able to type something like ff00.ffff (then press return) to see a short hex dump of the rom. There is no built-in BASIC like the Apple II's have, so you always need a disk in the internal drive.
Make sure the power light works - there is a small "on" indicator between the closed/solid apple key and the space bar. If this doesn't light up, the system does not think a keyboard is connected. If the light is functional, you may have to look into replacing the keyboard encoder chip.
yes the keyboard is powered, as I wrote above the reset keys work as well as the ctrl and open apple keys, everything else seems dead, so the encoder is dead I presume?
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None of the modifier keys (like control, reset and the apple keys) go through the keyboard encoder. Although there may be other chips that could cause this kind of failure, I have heard the original encoder chips are fairly static sensitive. Joe's Computer Museum (jcm-1.com) sells a "Universal Keyboard Encoder" module. Beyond this, I have no further suggestions.
I'll try to measure if the correct voltages arrive at the encoder, if the -12 and 5 volts arrive correctly I'll buy a universal encoder