Re: Power supply cap list

From: James MacPhail <gg__at_email.domain.hidden>
Date: Fri, 12 Oct 2007 13:15:22 -0700

>replacement capacitors for the Datapower 1.8A power supply? (US version)

In the DataPower version of the PSU, all of the parts are consistent regardless of line voltage. Internal jumpers are used to set the line voltage as described in the lisafaq:


FYI, the one part that varies according to line voltage in the 1.2A PSU is transformer T2.

Here is a list of DigiKey part numbers for 1.8 Amp DataPower PSU primary side capacitor replacements. I believe they fit and work, but use them at your own risk.

Perhaps someone else has compiled a list of secondary side capacitors?

C8, C9   P11636-ND
C3, C4   P4629-ND
C1, C7   P4613-ND
C5, C6   P4633-ND
C2       P10730-ND

When purchasing alternate parts, check the lead spacing, as modern capacitors tend to be smaller for the same value compared to these old ones. I suppose we should have a table listing the specs as well as possible part numbers.

It is suggested that C1 through C7 should be replaced if they have a transparent case with visible cracks.

Capacitor positions C1 through C7 have more than one set of holes for use of different sizes of capacitor. The above should fit, but might use different holes than the original capacitor on your particular PSU.

When replacing either C8 or C9, replace both if possible.

C8 and C9 are polarized. Note the white + on the component side near the designation. (If you put it in the wrong way, it may explode filling the room with acrid smoke.)

Safety note: C8 and C9 run at the rectified line voltage (170V DC), so you should always:

  1. unplug the PSU and wait a few hours before working on it
  2. check the voltage on the capacitors before removing them; under 10V is probably safe enough.

HTH, James

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