Quoted from ChrisHibler:What I do for all power/driver boards that come through here is...
...replace J101, 102, 103, 112, and J114...all power in/out headers.
...replace J115, 120, 121...all the GI headers.
...replace C2 and C4. C2 leaks. C4 is in the 5VDC circuit.
...replace C5. C5 is the big 15,000uf cap that filters the 5VDC.
...remove solder at the LM323K and flow new solder into the joint.
On the MPU...
...replace C31, 5V filter cap
...replace J210, power input header
...socket and install NVRAM
...replace the voltage watchdog with a version that trips at lower voltage
...I'll mostly socket U20 (the ULN2803) on WPC-089 MPUs as was done for WPC-S and WPC-95 MPU boards
I hope this helps you and others.
Great summary @chrishibler. Do you have a similar breakdown for Sys 11?
