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1. SCOPE 

This document describes the detail specifications for SEJIN’s SKM-2040 keyboard. 
 

2. MECHANICAL SPECIFICATION 

2.1 KEYSWITCH(MA-41) 

OPERATING SYSTEM : non-lock tactile back. 
TRAVEL AMOUNT : 3.8

±

    0.5mm with measuring load of 200gf applied. 

OPERATING FORCE : 60

±

  25gf 

LIFE : exceed 10 million operations. 

2.2 KEY TOP 

The keytop pull out force shall be 0.5kg or more at normal temperature during initial state. 
The keytop shall be not pulled out by an ordinary typing operation. 
 

2.3 KEYTOP DEFLECTION 

Keytop deflection to on side shall be 0.8mm or less. 
 

2.4 VARIATIONS IN KEYTOPS 

 

 

 
2.5 KEYTOP AND KEY ARRANGEMENT : according to the attached drawing. 

 

2.6 SLOPE OF KEYTOP : step sculpture type. 
 
 
 

Summary of Contents for SKM-2040

Page 1: ...1 User s Manual M N SKM 2040 Sejin Electron Inc ...

Page 2: ... may cause harmful interference to radio communication However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or...

Page 3: ...ed OPERATING FORCE 60 25gf LIFE exceed 10 million operations 2 2 KEY TOP The keytop pull out force shall be 0 5kg or more at normal temperature during initial state The keytop shall be not pulled out by an ordinary typing operation 2 3 KEYTOP DEFLECTION Keytop deflection to on side shall be 0 8mm or less 2 4 VARIATIONS IN KEYTOPS 2 5 KEYTOP AND KEY ARRANGEMENT according to the attached drawing 2 6...

Page 4: ...applied at the rate of 3 to 6 times a second from any point within the region 45 conical to the vertical axis of key stem SLOW OPERATION The operating 1kg shall be applied at the rate of once a second from any point within the region 45 conical to the vertical axis of the key stem CHATTERING AND BOUNCE Operating force shall be applied according to Item OPERATING METHOD at 12V DC 0 2mA There shall ...

Page 5: ...comprises the key swith section and signal processing circuit The keyboard cable connects to the system with a 6 pin MINI DIN connector The following table shows the pin configuration and signal assignments Frame GND Shield 6 Pin Keyboard Data Keyboard Clock Vcc Ground Reserved Description 5 4 3 1 2 1 2 3 5 4 6 6 Pin ...

Page 6: ... The testing method shall be in accordance with 201A of MIL STD 202E No of vibration 10 55Hz to be logarithmically receiprocated for one minute Amplitude 0 5mm 0 02in Direction of vibration direction of X Y Z Time of vibration 2 hours IMPACT There shall be no abnormally in operation and appearance of the keyboard when an impact of 10G has been applied to package keyboard The testing method shall b...

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