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Alps KCC series

Overview

KCC was Alps’s standard data entry keyboard switch in the early 1980s. The date of introduction is not known, but so far no examples are known from before around 1979. To meet DIN compliance, the switch was redesigned to give KCL and KCM series (retaining the contact assembly but changing the shell shape and keycap mount), but KCC series remained in production at least as late as 1987 (the production date of a large batch of SKCCAF002A). The use of short switchplates suggests that production extended to 1989 or later.

Part numbers are known to have changed to the new format, and thus the series is likely to have changed to SKCC in the mid 1980s.

Models

The Yamaha QX1 used the short green switches. The service manual—dated as March 1985—gives these switches as KCC10903, while Eleport Corp in Japan were at one time selling them as SKCCBK0001 (sadly with an unreadable production date stamp). Eleport’s appear to have been the newer design, the same as the SKCCBJ switches that were sold with short switchplates.

Examples with black sliders are omitted from the table below, as they do not appear to be separate models.

Type Colour KCC model SKCC model Slider height
Momentary, higher weight Cream SKCCBJ Short
Momentary, lower weight Green KCC10903 SKCCBK
Momentary, short stem Dark grey
Alternate action Cream
Momentary, higher weight Cream SKCCAF Tall
Momentary, Facit mount Cream

SKCCAC is another model number, but the switch it belongs to is not identified.

Design

The design has changed a number of times over the lifetime of the series. These switches have been found with tall black, tall grey and short white “switchplate” contact assemblies as expected.

Notably, the exterior characteristics changed several times:

The base of the switch first gained chamfered side edges. This is assumed to be the first change as most examples have these chamfered edges.

By 1987, the recess that holds the terminal sealant changed from straight sides to curved sides. This can be seen in the large batch of 88,000+ SKCCAF002A switches acquired by Standard Supply, of which one 4000-piece box previously found its way to Quest Components. (See SKCC Tall Cream on the Deskthority wiki for photos.) As expected, these switches have grey “switchplates”, with an additional retaining ridge to hold the switchplate.

There are (or at least were) also surplus SKCCBJ switches in China. These have short white switchplates, which would date them to around 1989 or later. These have the bottom recess divided into two halves. The rounded ends of the recess are retained. The ridge that holds the switchplate is retained in the mould, even though it appears to serve no purpose at this stage.

Black switches

A topic of continued confusion, some tall switches are found with black plungers. Generally no more than a few are found in the same keyboard, but an Apple /// has been sighted with all black switches. Since tall cream is model SKCCAF, there is plenty of capacity for earlier models in the SKCCA subseries, and for black to be an older version. Alps are already known to have changed all the model numbers and plunger colours within SKCL/SKCM series around 1989, and this could have been the case here, too.

SCK

SCK is a related series that uses the same shell. The circular raised area on the top of the switch, that serves no purpose in KCC, is used in SCK to hold the external return spring. SCK has a stamped metal plunger. The internal have never been seen. This series is only known from Roland equipment.

SCH

There is tentative evidence to suggest that KCC series was previously known as SCH series. See under series names and model numbers for more information.

KBB

Apple II service literature shows that the Apple II “switchable” keyboards used “KBB” switches from Alps. The illustration of the keyboard is degraded through photocopying, and no Alps part numbers are given. There has yet to be any evidence to show unusual Alps switches, so the meaning of “KBB” remains a mystery. Allegedly there are a number of other switch types used in Apple II computers, according to a German site, but none of these types are illustrated with photos and none of them appear to be common types. The switches in the service documentation are KCC-shaped, but the existence of SCK shows that at least two series shared that shell (and three if you count General Instrument Series S950).

KCA

The Roland CR-78 used switch KCA10037. As this is an official part number from Alps, that suggests that KCA is a genuine series. Both the service manual date (June 1979) and the Roland part number are lower than the corresponding details for SCK, suggesting that KCA is not a replacement series name for SCK. This switch has yet to be seen.

General Instrument Series S950

General Instrument Series S950 is a virtually identical switch series to KCC. Examination of the mould markings indicates that either Alps moulded the parts (perhaps for assembly in one of the Mexico factories), or that Alps licensed the plans for the tooling system to General Instrument. Series S950 differs from KCC series in using Clare-Pendar mount, and in offering an angled keystem option.