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Mitutoyo 192-611

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awemawson:
Many months ago I bought what should have been a very nice Mitutoyo Digital Height Gauge. Initially the seller took weeks to send it (bad signs), then after I raised an ebay 'case' he sent it, but only wrapped in a single wrap of bubble wrap with no outer boxing, and by a common carrier.

awemawson:
Needless to say I was not surprised to find that it didn't work. Loads of argy bargy with the seller - and raising another 'case' I got a refund and told him to arrange collection, and if not collected in three months it would be scrapped.

awemawson:
It's been sitting on my desk now for well over six months, and the seller isn't contactable 'no longer a registered seller' on ebay. So I thought that the time was ripe to look inside and see if anything could be done before chucking it out.

This is what I found:

awemawson:
Now as you can see, the 6 way ribbon cable (which is actually 'flexible pcb') is torn that connects the encoder head to the main pcb.

Hard to see how this could have happened even in upacked transport, as the head and main pcb are both fixed to the sliding 'chunk' and don't move relative to each other except when it's dismantled.

Also one of the rubber 'conformal' press buttons is missing, and a bit of polystyrene has been put in it's place to push the external button 'out'

Conclusion: someone's been in here before and been hamfisted and torn the ribbon and lost the rubber contact  :(

I thought it worth while at least attempting a bodge, replacing the flexy pcb with wires. It's all VERY tight in there as you may imagine - I used the finest ptfe covered stranded wire that I have  - Tygaflor A spec 7/0.048 which ends up 0.65 mm over the insulation and is a pain to strip neatly.

Put it all back together, tried it - zilch, nowt, nothing  :(

Whipped it out again, connected up a lab power supply to the main pcb, tried again - hey it works  :ddb: Rather a lot of faffing around with the battery mounting arrangement (3 AA cells) and I've ended up with a height gauge that works but has one button NOT working due to the missing rubber 'contact'

awemawson:
I moved the missing rubber to the 'preset' function, so that the 'Zero' and 'hold' work, so the gauge will be useful, but what I really need is a replacement rubber contact like this:

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