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WANTED: Xernus / Sunrex 8110 Alarm Crono' Module or Watch

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Seiko7A38

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WANTED: Xernus / Sunrex 8110 Alarm Crono' Module or Watch

Post10 Aug 2011, 19:43

Bit of a long shot, this, but if you don't ask .... :-?

I'm looking for a good working Sunrex 8110 module, or beater Xernus LCD Alarm Chrono' (the tattier the better), with a working module.

For those of you who've never seen one out of the watch, it looks something like this from the top:

Image

And like this from the underneath (with the insulator removed) and ideally without the verdigris. :cry:

Image

Module is approx 31.0mm Ø and 3.0mm thick, with 4 pusher contacts. It uses a RW40 / 391 sized battery.
Some watches are made to last only as long as they are fashionable.
Some watches simply aren't made to last.
Seiko watches are designed to withstand the ravages of both time and fashion.
Some day, perhaps, all watches will be made this way.
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Seiko7A38

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Re: WANTED: Xernus / Sunrex 8110 Alarm Crono' Module or Watc

Post10 Aug 2011, 20:54

Seiko7A38 wrote:I'm looking for a good working Sunrex 8110 module, or beater Xernus LCD Alarm Chrono' (the tattier the better), with a working module.

A Xernus LCD Alarm Chrono using the Sunrex 8110 module would look very similar to this model (but without the 'solar panel'):

Image
Some watches are made to last only as long as they are fashionable.
Some watches simply aren't made to last.
Seiko watches are designed to withstand the ravages of both time and fashion.
Some day, perhaps, all watches will be made this way.
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Old Tom

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: WANTED: Xernus / Sunrex 8110 Alarm Crono' Module or Watch

Post11 Aug 2011, 09:34

That module would probably clean up very succesfully using an acid/bicarb/water/alcohol set of washes. I find that about 75% of LCD modules in a similar state do work after this treatment- worst problem is that the negative contact finger has turned to brittle blackness which means a hunt through the old parts box(es!). You have to dismantle the module completely to do this. don't just dunk the whole thing. If you cannot find one then well worth trying.
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Seiko7A38

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: WANTED: Xernus / Sunrex 8110 Alarm Crono' Module or Watch

Post11 Aug 2011, 10:53

Thanks for the advice, Tom. In fact, I was one step ahead of you. ;-)

I'd already stripped the module yesterday.

The PCB cleaned up quite nicely using ElectriCor VCI238 aerosol spray (akin to WD40), and gentle probing with cocktail sticks.
There's some minor collateral damage around the resistors near the battery contacts:

Image

But as you correctly assumed, the -ve battery terminal was toast; it's imprint remained only as verdigris:

Image

I don't have anything in the way of an LCD 'bits box', so as a first attempt I'm going to try to fabricate a new -ve terminal from an M4 solder tag.

This want ad is a 'back-up plan', in case my unqualified (LCD-wise) efforts fail. ~:(
Some watches are made to last only as long as they are fashionable.
Some watches simply aren't made to last.
Seiko watches are designed to withstand the ravages of both time and fashion.
Some day, perhaps, all watches will be made this way.
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Seiko7A38

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Re: WANTED: Xernus / Sunrex 8110 Alarm Crono' Module or Watc

Post11 Aug 2011, 11:15

It's interesting what you notice from looking at your own hi-res photos ....
.... (apart from the odd bit of verdigris that you missed cleaning off :oops: )

Seiko7A38 wrote:A Xernus LCD Alarm Chrono using the Sunrex 8110 module would look very similar to this model (but without the 'solar panel')


Looking at my first photo again, the 8110 module plastic spacer actually has a moulded recess to take the 'solar panel' below the LCD display:

Image

I wonder if they might have shared the same (but lightly modified) PCB ? :?:
Some watches are made to last only as long as they are fashionable.
Some watches simply aren't made to last.
Seiko watches are designed to withstand the ravages of both time and fashion.
Some day, perhaps, all watches will be made this way.

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