RS 76 full-travel keyswitches General data The RS 76 full-travel keyswitches are designed for configuring keyboards. They offer very comfortable operation with an overall height of 15.5 / 15.9 mm and a key travel of 4 mm. The modular system with a grid of 3/4 = 19.05 mm enables you to design any key block you may want. Mechanical contact system RS 76 M A gold alloy is used as the contact material and provides high contact reliability, low contact resistance and short bouncing time. Solid-state contact system RS 76 C The solid-state switch in Hall-IC technology ensures bounce-free and wear-free switching and a long operating life. Function: When pressing the keys, a permanent magnet changes its position relative to the Hall-IC and thereby generates an output signal. Their use is especially recommended in hostile environments and for heavy duty applications. Content RS 76 M full-travel keyswitch, non-illuminated 4 - 126 4 RS 76 M keyswitch, non-illuminated 4 - 127 RS 76 M keyswitch with diode, non-illuminated 4 - 127 RS 76 M keyswitch, illuminated 4 - 128 RS 76 M keyswitch, illuminated, momentary 4 - 129 RS 76 M keyswitch, illuminated, latching 4 - 129 RS 76 MX keyswitch, fully illuminated 4 - 130 RS 76 C keyswitch, non-illuminated 4 - 132 RS 76 C keyswitch, non-illuminated 4 - 133 RS 76 C keyswitch, illuminated 4 - 134 RS 76 C keyswitch, illuminated, momentary 4 - 135 RS 76 C keyswitch, illuminated, latching 4 - 135 Keycaps for RS 76, non-illuminated 4 - 136 Keycap for RS 76, opaque 4 - 136 Keycap for RS 76, opaque, with nail protection 4 - 137 Keycap for RS 76 with legend insert 4 - 137 Keycaps for RS 76, illuminated 4 - 138 Keycap for RS 76 with light bar 4 - 138 Keycap for RS 76, illuminated, with legend insert 4 - 139 Keycap for RS 76, illuminated, with nail protection and legend insert 4 - 139 Keycap for RS 76, illuminated, with legend insert 4 - 140 Keycap, fully illuminated, for RS 76 MX 4 - 140 RS Keycaps for RS 76, with legend, two-shot moulded/keycap sets 4 - 142 76 Keycap set for RS 76, symbols A-Z 4 - 142 Keycap set for RS 76, symbols 0-9 4 - 143 RS 76 accessories 4 - 144 Cover for RS 76 IP40 4 - 144 PCB Keyswitches Stock items are marked 4 - 119 by bold printed order numbers.RS 76 full-travel keyswitches The Rafi full-travel keyswitches RS 76 are modular Contact principle systems for designing individual key blocks and There are two contact principles: keyboards in the 3/4 inch (= 19.05 mm) grid. Mechanical (M): Cross contact (RS 76 M) Bridge contact (RS 76 M, illuminated) Definitions Contactless (C): Based on Hall-IC (RS 76 C) Momentary keyswitches Soldering Momentary keyswitches return to their initial position The soldering temperature should not exceed 250 C, the after being pressed (momentary action). soldering time not be longer tahn 3 seconds. All RS 76 C-keyswitches can be soldered in solder bathes. Latching keyswitches The assembled PCB should be cleaned only by using Latching keyswitches lock when actuated and are brushing machines from the soldering side ot the PCB. returned to their initial position when pressed again The cleaning agend should not exceed the component (push-push action). side ot the PCB. Keycap materials All keyswitches can be flow-soldered, provided that an Keycap without legend insert: ABS acid fluxer is used and that the whole unit is cleaned Keycap with legend insert: afterwards in de-ionised water. Keycap body: ABS Lens: PC Cleaning Keyswitches should not be washed in freon or similar Keycap, n-module substances as a lubricant is used, otherwise the operating A 2-module keycap f. ex. has the twofold length of a life of the keyswitches will be reduced. 1-module keycap. If complete keyboards are to be cleaned by dipping, it must be remembered that they keyboard may only be dipped in the dipping solution as far as the component side of the PCB. Legending of keycaps Keycaps can be legended by different methods: Engraving In this labour intensive process the keycaps are engraved Two-shot moulding with the required symbol, then inlaid with ink. Only used Using this method the symbol is separately manufactured for small volumes. from a plastic and then the appropriate keycap form is moulded round it. Advantage: The character becomes a Laser-printing integrated part of the keycap, thus eliminating abrasion. This method of legending can be recommended when 4 All Rafi keycap sets with standard legending are complete keyboards are required in different keyboard manufatured by this method. layouts for which Rafi will develop the respective Customer specific two-shot moulded keycaps on request. software. The keyboards can then be legended within a short time. This method of legending ist particularly Printing recommended for average to large volumes. Keycaps can be printed with a two-component ink on request. The abrasin of this kind of legending is high. Legend inserts This method of legending is suitable for average In the case of keycaps with replaceable legend inserts it is volumes. possible to print or engrave the legend inserts. As these insets are protected by the lens, there can be no abrasion here either. RS 76 4 - 120 PCB Keyswitches