Elecraft K2 Keying Modification Instructions - Manual (Page 2)

2
Parts Inventory
All parts to be changed or added are on the Control board except D36, which is on the RF board.
Ref. Description Qty. Part No.
C31, C46 Capacitor, .01 µF monolithic ("103") 2 E530009
C45 Capacitor, 22 µF electrolytic 1 E530012
RF-D36 PIN diode, 5082-3081, glass body 1 E560014
R22 Resistor, 82 k, 1/4 watt, 5% (gray-red-orange) 1 E500119
R21 Resistor, 270 k, 1/4 watt, 5% (red-violet-yellow) 1 E500101
Misc. Hookup wire, #24, green (used for insulation only) 4 inches E760008
Preparation for Modifications
1. Check your firmware revision by holding any switch while turning power on. The number displayed
on the left side of the LCD is the main microcontroller firmware revision (U6 on the Control board)
while the number displayed on the right side of the LCD is the I/O controller (IOC) firmware revision
(U1 on the RF board).
2. If the main microcontroller firmware revision is earlier than 2.04H, you'll need to replace it now. If
your IOC firmware is older than version 1.09, you will need to replace the I/O controller at the same
time. Complete all of the instructions supplied with the K2 Rev. 2 Firmware Upgrade.
3. Turn the K2 off and remove the top cover or KPA100 module.
4. To protect static-sensitive components, put on a wrist strap or touch a grounded surface.
5. Remove the Control board (first remove the KAF2 or KDSP2 if applicable).