Introduction

I recently picked up a Famicom Disk System for fairly cheap. After a successful belt replacement I decided to replace all the electrolytic capacitors.

List of Capacitors for the Famicom Disk System (FDS)

This is my finding and experience of recapping a FDS with FMD-01 Power Board and FMR-03 Ram Adapter.

The capacitor values given are the values of components that were installed from the factory (assuming my FDS was never serviced or recapped, which I don't think it was)

Board	Ref	Values	Termination Style	Notes
Ram Adapter	C3	50V 1uf	Radial	Height = ~7mm, don't think higher would fit
Ram Adapter	C4	16V 47uf	Axial	Length = ~15.5mm, Width = ~6.1mm (6.6 would fit)
Ram Adapter	C5	50V 1uf	Radial	Height = ~7mm, don't think higher would fit
Power Board	C1	25V 100uf	Radial
Power Board	C2	16V 47uf	Radial
Power Board	C3	25V 100uf	Radial
FDD Board	C1	6.3V 100uf	Radial	Height = ~7mm. Replaced with ~11.7mm (25V) does fit
FDD Board	C2	6.3V 100uf	Radial	Height = ~7mm. Replaced with ~11.7mm (25V) does fit
FDD Board	C3	6.3V 100uf	Radial	Height = ~7mm. Replaced with ~11.7mm (25V) does fit
FDD Board	C12	6.3V 100uf	Radial	Height = ~7mm. Replaced with ~11.7mm (25V) does fit

Thoughts

Did this need recapping? Probably not. I tested all the removed capacitors and all of them were within 10% of their stated capacitance and non of them were bulging or leaking. All of the replaced parts were either Rubycon or Nichicon, likely supporting the claim that quality branded capacitors are more reliable.

Why did I write this blog post? I noted that while the Console 5 list is correct and the only parts list I could find, it misses some important details which I've added to the table above, notably that C4 on the Ram Adapter is an Axial type capacitor and could be fit with a physically bigger one, the FDD board can be fit be physically bigger parts but C3 and C5 on the Ram Adapter probably cannot be (YMMV).

Also note, the Console 5 list does state that the FMD-05 Power Board uses an extra capacitor.