ELECRAFT KPA3 Instrukcja Użytkownika Pobierz pdf

Elecraft • www.elecraft.com • 831-763-4211

Elecraft K3

KPA3 Power Connector Replacement

Revision A Review, April 16, 2012

Introduction

The connectors furnishing high current to the KPA3 module have failed in certain units. Typically the pins on the

male connectors become overheated, damaging the female connector and reducing power to the KPA3. This

causes an ERR 12V message to appear on the K3s display. Note that this is not the only reason you may see

the ERR 12V message. There are many possible causes. Consult your K3 Owner’s manual for details.

The replacement connectors have gold plated pins to ensure adequate current carrying capacity without future

trouble.

There are two sets of connectors involved. One carries the current from the K3 RF board to the KPAIO3

interface board and the second set carries current from the KPAIO3 board to the KPA3 power amplifier module.

If you are replacing the connectors as a preventative measure, you need change only the male connectors. The

female connectors in the K3 are already gold plated. However, if you have suffered damage as indicated by

discolored pins or other signs of obvious overheating, you must replace the female connectors as well. It is

certain that the female connectors were damaged internally by the heat.

Parts and Tools Required

You will need a temperature-controlled ESD-Safe soldering station, solder, and your normal hand tools such as

needle nose pliers and diagonal cutters. In addition, you will need de-soldering tools such as a solder-sucker or

vacuum de-soldering tool. Some of the connector contacts served with wide circuit traces which act like a heat

sink and may make it difficult to completely remove the solder from the pads with de-soldering wick. A DMM is

needed for checking for shorts.

A kit containing the required parts is available from Elecraft. Order KPA3CONMDKT. It contains the following

parts:

IMAGE DESCRIPTION QUANTITY

ELECRAFT PART

NUMBER

3X2 pin gold male connector P67B and P68B 2 E620255

10X2 right angle gold female connector J68B 1 E980223

13x2 right angle gold female connector J67B 1 E620144

In extreme cases of corrosion or overheating there may be damage to the connectors on the KPAIO3 interface

board (see Figure 18, on pg 10). Female connectors are included to replace them if needed, or you may choose to

replace the KPAIO3 board assembly. A replacement KPAIO3 is not included in the kit, but you can order one

separately if needed. Order E850271 from [email protected]

1 2 3 4 5 6 ... 15 16

Podsumowanie treści

Strona 1 - Elecraft K3

Elecraft • www.elecraft.com • 831-763-4211 Elecraft K3 KPA3 Power Connector Replacement Revision A Review, April 16, 2012 Copyrigh

Strona 2 - Procedure

KPA3 Connector Replacement Page 10 of 16 On the KPA3 module, inspect the six pins of P68B (see Figure 17) for corrosion or discoloration from hea

Strona 3

KPA3 Connector Replacement Page 11 of 16 If you removed the KXV3 board earlier, replace it now. Be sure all the pins engage the J66 on the K3 RF

Strona 4

KPA3 Connector Replacement Page 12 of 16 If your K3 is equipped with the K144XV option, reconnect the two coaxial TMP cables that you removed ear

Strona 5

KPA3 Connector Replacement Page 13 of 16 1. Reconnect the coax TMP cables from the KXV3 module to the K144XV module. The cable with the white ma

Strona 6

KPA3 Connector Replacement Page 14 of 16 Figure 23. K144XV Ref Lock Cable Connections. Replace the KPAIO3 interface board (Figure 5, pg 4). The

Strona 7

KPA3 Connector Replacement Page 15 of 16 Replace the fan panel using the 4-40, 3/16” (4.8mm) black pan head screws you removed earlier (see Figur

Strona 8

KPA3 Connector Replacement Page 16 of 16 Hold the top cover above the K3 and reconnect the speaker wire (see Figure 26), then replace the top cov

Strona 9

KPA3 Connector Replacement Page 2 of 16 Procedure A grounded wrist strap and ESD dissipating mat are recommended whenever you work inside your K

Strona 10

KPA3 Connector Replacement Page 3 of 16 Remove the three screws securing the KPA3 amplifier module to the shield assembly (see Figure 3). Figure

Strona 11

KPA3 Connector Replacement Page 4 of 16 Remove the KPAIO3 interface board as shown in Figure 5. Figure 5. Removing the KPAIO3 Board. Remove the

Strona 12

KPA3 Connector Replacement Page 5 of 16 Remove the KIO3 Remote I/O Module as shown in Figure 7. Figure 7. Removing the KIO3 Remote I/O Module. R

Strona 13

KPA3 Connector Replacement Page 6 of 16 If the KXV3 board is installed, remove the screws, washers and nuts securing it to the rear panel. That w

Strona 14

KPA3 Connector Replacement Page 7 of 16 At the opposite end of the rear panel are one or two SO-239 “UHF” antenna connectors, depending upon whet

Strona 15

KPA3 Connector Replacement Page 8 of 16 Locate male multi-pin connectors P67A and P67B near the back edge of the K3 main (RF) circuit board (see

Strona 16 - REPLACE ALL THE SCREWS!

KPA3 Connector Replacement Page 9 of 16 Use your de-soldering tool to clean the solder out of the pads and then insert the replacement 3X2 connec

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