Editing Hi-Tek High Profile (section)

==Servicing and parts==
[[Computer service manual findings]] show that, as the switch grid is monolithic, there were provisions made to service individual switches. Each switch component was assigned its own part number, and an insertion tool was available to assist with insertion of replacement contacts. Section 5.6.6 of the Lear Siegler ADM-3A maintenance manual contains an illustrated guide to replacing a pair of switch contacts using the insertion tool. This in itself appears to confirm that the ADM-3A keyboard was supplied by Hi-Tek (unless Stackpole used Hi-Tek part numbers).

The following part numbers have been found:

{| class="wikitable"
!Part!!Part numbers
|-
|Plunger, momentary||173-40213 (NABU 3100)
|-
|Plunger, locking||173-40334 (NABU 3100)
|-
|Cam, locking||173-40260 (NABU 3100)
|-
|Spring, 2 oz||''none'' (NABU 3100)
|-
|Contact, solid||173-30107 (NABU 3100)<br>373-30052-2 (LSI ADM-3A)
|-
|Contact, fingered||173-30108 (NABU 3100)<br>373-30053-2 (LSI ADM-3A)
|-
|Tool for contact replacement||173-10023 (NABU 3100)
|-
|Stabiliser wire (8 units)||373-10020 (CDC IST II)
|-
|Stabiliser wire clip||373-30104 (CDC IST II)
|-
|Stabiliser insert||373-30105 (CDC IST II)
|}

The NABU 3100 (formerly Volker-Craig VC3100) keyboard has yet to be seen, and it may be that some of these parts are specific to [[Hi-Tek Dovetail Series]].

The CDC IST II service manual also cites a 2 oz spring for normal keys, and a 3 oz spring for the space bar.