Elecraft K1BKLTKT LCD Mod Kit User Manual download pdf

A Backlighted LCD for your K1

(K1BKLTKIT)

Tom Hammond - NØSS, July 27, 2006

Rev C

Thanks to Wayne Burdick, N6KR for suggesting this implementation of backlighting the K1 display.

APPLICABILITY

This modification is applicable to all revisions of the K1.

BACKGROUND

Builders have often discussed various methods of adding backlighting to their K1 LCD display.

Early K1's were supplied with opaque rear polarizers which would not pass light. On current K1s

Elecraft now uses a 'transflective' rear polarizer, capable of both passing light from the back side AND

of reflecting ambient light entering from the front of the display. It is the transflective LCD display

which now permits backlighting.

Elecraft does not presently supply a backlight with the K1 kit. However, if you have not assembled your

K1, you can add a backlight at the time of construction. If your K1 has already been assembled, you

must remove the existing LCD (regardless of which type of LCD it happens to be), install the backlight,

then install the replacement LCD supplied with this modification kit. Both situations are covered here.

PARTS NEEDED

A kit of parts for use in making the changes can be ordered as the "K1BKLTKIT". This kit consists of

the following items:

Quan. Item Elecraft Part #

1 Transflective LCD display E600015

1 K1 Backlight E100192

1 Resistor, 330Ω1/4W (Orange-Orange-Brown) E500103

(for 6mA current draw, lower brightness backlight)

1 Resistor, 200Ω 1/4W (Red-Black-Brown) E500020

(for 10mA current draw, brighter backlight)

1 Insulator Card Assembly, K1 LCD E850215

1 2 3 4 5 6

A Backlighted LCD for your K1 1

Summary of Contents

Page 1 - A Backlighted LCD for your K1

A Backlighted LCD for your K1(K1BKLTKIT)Tom Hammond - NØSS, July 27, 2006Rev CThanks to Wayne Burdick, N6KR for suggesting this implementation of back

Page 2

MODIFICATIONRemoval of K1 Front Panel1. Remove the four (4) case screws which secure the K1 front panel to the main body of the radio.2. Pull the fron

Page 3

a small amount of fresh solder to each connection to assist in initially 'wetting' the solder wickduring the solder removal process. Use a m

Page 4

cleanly between the PC board pins for the LCD (DS1) and, when placed up against C4 (just tothe right of the LCD), it will just clear the leftmost four

Page 5

21. The LED current-limiting resistor must now bechosen. A value of 330 ohms will give you a currentdrain of about 6mA with adequate illumination. Ava

Page 6

If you find the illumination to be too dim (or too bright), select an appropriate value resistor andreplace the resistor originally chosen and install

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Elecraft K1BKLTKT LCD Mod Kit User Manual

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