First, does anyone know what this chip is ? Nothing comes up in the google. Thats a shot of PU-7 board (SCPH-1001 NTSC U/C) Second, does anyone have wiring diagram for installing 120508A on PU-18 (SCPH-5501)? I found http://modchip.aeug.org/install/508-pu18.html but the first photo doesnt match the second one ;-), so I wanted another source to double check wiring points
If i'm not wrong it should be a first and acient clone of the first chinese modchip, so it's a very first variant of oldcrow modchip... For the 550x diagram i don't see differences, the install diagram is correct
http://users.libero.it/enrico.zaniboni/FAQ.htm The one pictured is a Zilog Z8, and most likely Old Crow. As for the modchip diagram for 12C508A, which chip exactly are you trying to install? The number of wires will vary depending on what's actually programmed on the chip (4-wire/Old crow, MM3, Mayumi for example).
The Zilog modchip is installed on a SCPH-1001 (PU-7) and doesn't seem to work well with CD-Rs (or at all?). I don't have many CD-Rs left to test. And I've tried swapping several different laser assemblies with the same result. Audio CDs play but not the backups. So, since the modchip doesnt appear to work, i am asking help to identify it. Perhaps its only intended to defeat region protection?! Now, the 12C508A is the one currently installed on a SCPH-9001 with 7 wires. It works great except for one annoying feature - the disc never stops spinning. Ever. Also, since the controller port doesnt work, and the 9001 doesnt have Parallel port, i want to move 12C508A to 5501 console. So my confusion with moving 12C508A to SCPH-5501 is this. If you look at http://modchip.aeug.org/install/508-pu18.html, the 2nd photo has brown,blue,yellow wires soldered to points grouped together. BUT in the 1st photo, the yellow and blue are attached to different points, and brown wire is not even visible!
That's probably a blown fuse for the controller ports. It's an easy fix. As for continuous spinning I doubt that it's the modchip. Check if the lid close button is working properly (with a multimeter).
Talking about the 9001, maybe there's some problem with the modchip door status wire? (pin 7 IIRC) You can try desoldering it...
