"GregS" <
[email protected]> wrote in message
news:
[email protected]...
> In article <[email protected]>,
> [email protected] (GregS) wrote:
>>In article <[email protected]>,
>>"Paul"
>> <[email protected]> wrote:
>>>
>>>[email protected] wrote:
>>>> sci.electronics.repair, rec.bicycles.tech
>>>>
>>>> Leads from the cateye enduro's cyclocomputer body snapped off
>>>> during
>>>> an accident.
>>>>
>>>> I tried soldering the new length of magnet pickup wires following
>>>> the
>>>> epoxy? block covering the pickup's connection pins molded into
>>>> the
>>>> computer's bar mount AND then Gooping the wire's solder
>>>> connections
>>>> to the bar mount at the epoxy block
>>>>
>>>> Goop is silicone adhesive -
>>>>
>>>> Question is does the goop silicone provide electrical insulation
>>>> at
>>>> this low voltage flow?
>>>>
>>>> The computer stopped recording data after 3-4 miles.
>>>>
>>>> If the Goop is a no go what adhesive is durable and adequate
>>>> insulation? What are cateye bodies made of and what adhesive
>>>> works best
>>>> there?
>>>
>>>Any silicone (RTV) that I've worked with is a good insulator when
>>>fully
>>>cured.
>>>I wouldn't be surprised if it is somewhat conductive before it is
>>>cured, but I never checked.
>>>I never apply voltage until it is fully cured.
>
>
> By the way, I have applied HV before curing. it does well, but its
> probably better when fully curred.Thats the Type I silicone.
>
> greg
>
>>Rtv need not be capitalized. Goop is not silicone to me. Its more
>>like a
>> plastic.
>>I use the different Goops, including Shoe Goo, and I am not going to
>>claim it
>>has no reaction to conections, but I don't think I have seen
>>problems. If Goop
>> is used in the sun,
>>it should contain UV inhibitors like Marine Goop has. Goop is one of
>>the
>> strongest
>>glues, but retains some flex. It takes several days for full cure.
>>Silicone
>> shuld have
>>no conductivity, allthough it is not a vapor block, where Goop may
>>have a good
>>vapor lock. Electrical connections should be painted with enamel
>>before
>>applying silicone.
>>
>>greg
Speaking of HV, I can't imagine the voltages in the Cateye causing any
significant electrical stress, and hence any voltage induced failures
even without Goop or some sealant, as long as everything started clean
and stayed clean. I could imagine an additional mechanical problem
having lead to another open circuit due to the three miles of road
vibration. In some such repairs I've tried, I've not been able to
re-solder broken leads/pins with low enough energy to prevent
additional damage. Two reasons for this: too cheap to buy the proper
very-low power soldering system, and not proper skills for such
delicate work. And this after having been certified to solder
according to NASA standards! But nothing in spacecraft back in those
days was as tiny as modern commercial electronics.
Datakoll, I think something else in your Cateye has broken, and it
might or might not be associated with your repair, based on what
you've told us.
Ken
