beautypg.com

Elecraft K1BKLTKT LCD Mod Kit User Manual

A backlighted lcd for your k1

background image

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

Re

s

i

s

t

or

,

330Ω1/

4W

(

Or

a

nge

-Orange-Brown)

E500103

(for 6mA current draw, lower brightness backlight)

1

Re

s

i

s

t

or

,

200Ω

1/

4W

(

Re

d-Black-Brown)

E500020

(for 10mA current draw, brighter backlight)

1

Insulator Card Assembly, K1 LCD

E850215