User's Manual

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1. SCOPE

This document provides a specification for the SEJIN standard USB keyboard.

2. MECHANICAL PERFORMANCE

2.1 Key switch Operation

2.1.1 Operating system

Non - lock rubber tactile feeling.

2.1.2 Stroke

3.5±0.5mm with measuring load 200gf applied.

2.1.3 Operating Region

ON/OFF

Swithing

region

0.7mm

0.8mm

Total traval

3.5

±0.5

Bottom en

ON re

ion

OFF re

ion

2.1.4 Operating force

The operating curve is defined to the following drawing and the relationship between

the operating force and travel is provided. The operating force has a tolerance of 60±

25gf

2.2 Operating feeling

No definite stickiness or other abnormality shall be allowed when force is applied with

a finger to keytop center at the rate of 3 times on a second.

2.3 Construction and dimensions

Note: The applied keycap for “F” row is “E” row keycap.

2.4 Key top Height Variation

The key top height variation must not greater than 0.5mm when measured between the

center to center of keys next to each other. The measurement will be performed with keys

2.0mm

Summary of content (7 pages)

PAGE 1
. SCOPE This document provides a specification for the SEJIN standard USB keyboard. 2. MECHANICAL PERFORMANCE 2.1 Key switch Operation 2.1.1 Operating system Non - lock rubber tactile feeling. 2.1.2 Stroke 3.5±0.5mm with measuring load 200gf applied. 2.1.3 Operating Region Top end 0.8mm Total traval 3.5±0.5mm 2.0mm 0.7mm OFF region ON/OFF Swithing region ON region Bottom end 2.1.
PAGE 2
in the home positions. 2.5 Keytop Alignment The key top alignment tolerances must not exceed 0.5mm when keytop measured between the center to center of keys next to each other. The measurement will be performed with keys in the home positions. 2.6 Rotational Alignment The maximum rotation of key shall be less than 0.5mm as shown below. Height variation Rotational Alignment Alignment 2.
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4. ELECTRICAL REQUIREMENTS 4.1 Operating voltage range DC 5V±0.25 4.2 Operating current Max 100mA 4.3 Insulation resistance More than 100M ohm at 250V DC 4.4 Contact resistance 2KΩor less 4.5 Chattering and bounce Operation force shall be applied according to the normal operating method at 5V DC, 5mA.There shall be no bounce and chattering within 10msec when it is measured using a specially prepared tester or a synchroscope. ※ Chattering and bounce are defined in the following diagram : 5.
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5.5 Drop Test (Non-Operating) Purpose of test: To verify the keyboard’s ability to withstand being dropped from lap and desk heights. Test Parameters/Conditions: 25°C @ 50% R.H. Standard: After test, If the keyboard is recoverable(able to be re- assembled), it is acceptable. Packing Condition Nonpacking Drop surface Height Hard wood Carpet 70Cm 70Cm Inner box Concrete 90Cm Out box Concrete 60Cm Test Description 2 drops for each corner 1drop for 6 surfaces 1drop for 6 surfaces and 4 corners.
PAGE 5
Thanks for using SEJIN Keyboard (MODEL:SKR-4200U) THE SEJIN Keyboard Designed with the users in mind, it has a pleasant appearance and is Convenient to use. No extra power supply is required. It is compatible with the Microsoft Keyboard. Mini-keyboard INSTALLATION Turn the power supply off to your computer. Check the USB keyboard/mouse port at the back of your computer and insert The connector at the end of the Key-board cables into the usb port . Turn the power supply on to your computer.
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PAGE 7
FCC NOTICE THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITION: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDERSIRED OPERATION. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.