Elecraft KX1 Manual User Manual

Page 27

LECRAFT

Visual Inspection

Verify correct orientation (banded end) of diodes D2 and D3,

using the parts placement drawing (Appendix F).

Verify the correct orientation of each electrolytic capacitor. The

side of the capacitor with the strip and minus ( - ) sign must face away
from the + sign printed on the board.

Examine both sides of the PC board closely for solder bridges,

cold solder joints, or unsoldered components.

Resistance Checks

Make the resistance checks listed below with your DMM’s

negative (-) lead connected to the circuit board ground at the screw
hole just above capacitor C6.

Test Point (+)

Resistance

U1 Pins 1, 3, 4, and 20

> 1 k

U1 pins 8 and 19

< 5 ohms

U1 all other pins

> 10 k

U3 pin 3

< 5 ohms

U3 all other pins

> 10 k

D2 or D3 cathode
(banded end), S1 On

> 1 k

D2 or D3 cathode,
S1 Off

> 10 k