The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
Russ,
Yes I had considered that but I'm scared to do more damage. I've dug out a x20 microscope and have been looking round the circuitry, but it is very confusing - the SMD markings are rather coy about what they really are - I have found a document that helps somewhat in the translation (attached) and I have found what appears to be a transistor type 5B (MMBT4123) that seems to be s/c base / collector. It appears to buffer the output of one of the LM833 op amps.
Now I'd like to just remove it and / or the LM833 but these things are sized like a grain of rice and I'm just not equipped for this size of component -
I did seriously consider getting myself a hot air re-work station, but even if I did, I don't have the skills working at that scale :bang:
. . . time for a re-think :scratch:
oops - the .pdf was too large have a link instead:
http://www.marsport.org.uk/smd/mainframe.htm
Pete.:
I have a hot air gun if you need to borrow it Andrew.
awemawson:
That's very kind Pete, let me have a think about it - you can't lend me two good eyes and non trembling hands as well can you :lol:
mc:
SMD working isn't that bad, although I'm not sure I'd want to start with trying to fix something quite so expensive!
Key thing is good fine tipped tweezers, as they make positioning components far easier.
Also suitable solder paste and dispenser make fitting bits far easier. I don't mind building SMD boards, but the fact good solder paste is so expensive compared with ye olde solder wire, and it goes off, means I try and avoid using SMD, but some times it's unavoidable.
awemawson:
Well PK has VERY kindly offered to take a look at this unit as I understand his company has the suitable facilities, so it's started on a long journey to the other side of the world this morning on a '5 day target' service from the Royal Mail.
Very many thanks to PK who is definitely a 'good chap' as I was going cross eyed chasing this problem :thumbup:
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