PSIONFLEXI

 

(now part of Apuljack Engineering Ltd)

 

Chartered Electronics Engineers - the professionals in the industry

HOME > FAQ

Frequently Asked Questions

General

Why choose Psionflexi?
Where can I find more information about Psion machines (links)?

 

DIY repair info

Can I do the flexi replacement myself?
What soldering iron should I use?
What soldering technique should I use?

 

 

 


General

Why choose Psionflexi?

Don't take our word for the credibility of our services/products, check out what people say about www.psionflexi.co.uk and www.apuljackengineering.co.uk on the web and see what quality and service you are getting.

If you are considering some of the cheaper flexi's that you may have seen, ask yourself the following questions:-

 

  • Is the flexi designed by Masters Degree qualified Chartered Electronics Engineers?
  • Is the flexi designed by people who have 15 years of military circuit board design experience?
  • Has the flexi been 'designed' for quality or is it just a cheap copied import from Japan/Taiwan?
  • Does the flexi have hot air levelled tinned contacts for easy soldering?
  • Does the flexi still have the long split between the main and touch screen connections (another major failure point)?
  • Do the flexi's met the stringent requirements of BS 123400-003?
  • Are the flexi's manufactured by a military circuit board supplier?

You will automatically get all of the above features with our flexi's.

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Where can I find more information about Psion machines (links)?

For general use, here are some other useful links to Psion/PDA/EPOC information:-

 

 

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DIY Repair Information

Can I do the flexi replacement myself?

The joints between the screen and the  flexi are spaced at 1mm (40 thou) which is not fine by today's standards (typically 15 thou).  If you are used to soldering TQFP's or SOIC IC's then you should be fine.  If you do not know what these are then you will struggle!  However, they are not THAT fine so If you are used to soldering electronic components then with a bit of practice you should be OK.

Please note, however, that we will not replace your flexi if you damage it whilst fitting.

All your batteries have to be removed during the repair so your machine will be returned as if it had had a hard reset.  Therefore none of your data will be retained.

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What soldering iron should I use?

The flexi's are made from military grade material but they are not indestructible!!  The quickest way to kill a flexi is to overheat it or heat it for too long.  The basic plug in type soldering irons with file down tips (usually with no base unit) are NOT temperature controlled and can easily overheat the flexi.

You should use a temperature controlled iron with a small tin coated tip that is in good condition.  If you do not have one then try borrowing one or find a company/friend that can do it for you. For information we use a Professional Weller soldering iron with a 1.2mm tip set to 370°C.

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What soldering technique should I use?

Align and stick down the flexi properly before soldering it makes life much easier! Start with the joint furthest away from the edge of the screen and use a pair of locking tweezers to hold the flexi down and folded.  Keeping the iron very close to the junction of the flexi and screen and apply about 1mm of 22swg solder and immediately contact the joint.  Move the iron along the length of the gold contact to ensure it is completely covered in solder.  The joint should look even and shiny with a small fillet between the flexi and screen. If it looks dull then either you were not quick enough or the solder got too hot.

Top Tips!

  • The secret to successful soldering is Cleanliness and Flux
  • Make sure you use the IPA wipe in the Installation Kit to clean off all the old flux and clean the flexi before fitting. Grease on the flexi from your fingers can affect how the solder flows.
  • Use new Rosin cored 22swg solder
  • When soldering, if you apply solder to the tip first the flux will burn off in under 1 second making the solder now useless so solder the joint before this happens.
  • Always keep your iron cleaned with a proper tip cleaner before every joint
  • DO NOT tin the gold contacts prior to fitting as this will stop the flexi being close to the PCB