Rainbow 100 PSU capacitor list

[Warner Losh]

If you disconnect the power supply from the motherboard, disks, etc, does
it still pop? If so -> bad power supply. If not, reconnect one at a time
and see if it is load based (eg each of them connected alone causes it). If
it is purely load based, then it's a bad ps). If there's one thing that
causes it to pop, there's an issue there. If it is the mobo, you might also
try w/o the VR201 connected, since if that's pulling too much power, it can
cause a PS overload (though I've never had this issue, I've read about it
years ago).

Warner

On Tue, Mar 5, 2019 at 2:56 PM Alan Perry <aperry at snowmoose.com> wrote:

> OK, got back to this ...
>
> Plugged in the Rainbow 100. Flipped the power switch. No LEDs lit.
>
> There is a white circuit breaker on the power supply. When I switch on the
> power, it pops out. I switch off the power, reset the breaker, switch on
> the power and it pops out again.
>
> alan
>
> On 3/1/19 2:32 PM, Warner Losh wrote:
>
> Since you don't hear the gears grinding in the rx-50, that's a failure
> fairly early on. The LEDs in the back of the case will tell you something.
> There's a table for LED codes in the Rainbow manuals somewhere. If NO LEDs
> are on, that tells you something too (they all light up on application of
> power).
>
> I've had my rainbow for 30 years, and haven't had to deal with bad caps in
> the power supply, but I've also gone as long as a decade with the Rainbow
> in a box...  And now I have 4 of them (2As and 2Bs)....
>
> Warner
>
> On Fri, Mar 1, 2019 at 3:13 PM Alan Perry <aperry at snowmoose.com> wrote:
>
>> I will look at that when I get back home after the weekend.
>>
>> On Mar 1, 2019, at 2:01 PM, Warner Losh <imp at bsdimp.com> wrote:
>>
>>
>>
>> On Fri, Mar 1, 2019 at 2:56 PM Alan Perry via cctech <
>> cctech at classiccmp.org> wrote:
>>
>>> Initially it booted and ran for a while until I switched it off.
>>>
>>> The last time it responded to the power switched, components powered up
>>> and the FDD started operating. Then suddenly everything stopped like the
>>> plug had been pulled.
>>>
>>> Now it does nothing (apparent) when it is switched on.
>>>
>>
>> The rainbow has a number of LEDs in the back that it frobs while
>> booting... Do any of them light up?
>>
>> Warner
>>
>>
>>> alan
>>>
>>> > On Mar 1, 2019, at 1:44 PM, dwight <dkelvey at hotmail.com> wrote:
>>> >
>>> > Maybe I need a little clearification.
>>> > When you turn the switches off, it boots?
>>> > Dwight
>>> >
>>> >
>>> > From: cctech <cctech-bounces at classiccmp.org> on behalf of Alan Perry
>>> via cctech <cctech at classiccmp.org>
>>> > Sent: Friday, March 1, 2019 1:35 PM
>>> > To: Ethan Dicks
>>> > Cc: General Discussion: On-Topic Posts
>>> > Subject: Re: Rainbow 100 PSU capacitor list
>>> >
>>> >
>>> >
>>> > > On Mar 1, 2019, at 7:52 AM, Ethan Dicks <ethan.dicks at gmail.com>
>>> wrote:
>>> > >
>>> > > On Wed, Feb 27, 2019 at 1:21 PM Alan Perry via cctech
>>> > > <cctech at classiccmp.org> wrote:
>>> > >> Hi,
>>> > >>
>>> > >> I think that I need to re-cap the power supply in a Rainbow 100.
>>> Does
>>> > >> anyone here know if anyone has put together a list of capacitors
>>> used in
>>> > >> the power supply that I can use to order parts?
>>> > >
>>> > > I don't have a list (I just got a pair of Rainbows last month) but
>>> > > given the era of manufacture, I'd be looking for Rifa EMI filter caps
>>> > > by the power inlet.  I've had those fail in BA23 cabinets and in a
>>> > > Commodore D9060 hard drive, and a TRS-80 Model 4.
>>> >
>>> > Thanks. When I first got the Rainbow, I asked here about what to look
>>> for before powering it up and was told about Rifa caps and what look/listen
>>> for.
>>> >
>>> > I eventually threw caution to the wind and just powered it up and I
>>> ran it for 15-20 minutes. The PVA in the monitor was really cloudy, so I
>>> didn’t use the system anymore until I removed the PVA over Christmas. I was
>>> testing everything after that and the system was booting up when the power
>>> all switched off like it had been unplugged.
>>> >
>>> > alan
>>> >
>>> >
>>> > >
>>> > > This is totally different than failing/bulging electrolytics.
>>> > >
>>> > > -ethan
>>> >
>>>
>>
>