Soemtron ETR Calculator Spare Parts

Stress fractures in a keyboard guide plate, click image for a larger version. ©2011
Stress fractures
(Click any image for a larger version)
New 3D printed cabinet latches, click image for a larger version
Soemtron ETR220/222
Cabinet latches
Right hand 3D printed cabinet latch, click image for a larger version
Soemtron ETR220/222
Right hand latch

Plastic parts for the Soemtron ETR range of calculators are now around 50 years old and have reached their end of life becoming extremely brittle, none more so than the cabinet latches that hold the two-part covers to the main chassis.  These seem to be the first items to break.

Plastic mouldings in the ETRs were sparingly used (EG. Decimal point and mains switches) and do seem to have been quite well made in most instances, but 50 years on since their manufacture they have become prone to sudden disintegration.  Some items, like the keyboard guide plate suffer from stress fractures whilst not actually falling apart. (Above right)

So, starting with the cabinet latches of which we have had multiple failures, we have designed replacements and had them 3D printed.  These are direct replacements for the original latch parts in the ETR220 and 222 units and require no modifications to fit, simply unscrew the old broken latch and swap with these new parts.  We have stock to hand so for price and delivery contact contact us, or email us .

We also have spares stocks of other Soemtron items including -

  1. Brand new unused Z570M display nixie tubes (DP pin 4?), P# 00–560–9558–3,  data.
  2. Brand new unused Z573M display nixie tube (DP pin 10?), data.
  3. Reclaimed keyboard switches with formed pins for direct replacement, P# 00–803–7024–8.
  4. Reclaimed microswitches.  With a couple of wire links these can be used in place of the standard keyboard switches, they can also used for the Mains On/Off switch, P# 00–803–7005–5.
  5. Several ETR220 PCB assemblies for boards 3, 4, 5, 6, 7, 8, 10, 12.
  6. A new equivalent part (TC290) for the original power supply mains input filter which often "leaks" its contents and then destroys itself, P# 00–422–182–4,  data.
  7. New 3D printed cabinet latches in left (05–220–3023–7) and right (05–20–3024–5) hand variants.  (2nd photo above right).
  8. Complete ETR22 keyboard assembly, but missing a connector and part wiring loom (replaceable), P# 20–220–1097–7.

Contact us, or email us for prices and shipping.

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