Elecraft KRX3 User Manual download pdf (Page 6)

We strongly recommend you take the following anti-static precautions (listed in order of importance) to avoid

trouble:

 Leave ESD-sensitive parts in their anti-static packaging until you install them. The packaging may be a

special plastic bag or the component’s leads may be inserted in conductive foam. Parts which are

especially ESD-sensitive are identified in the parts list and in the assembly procedures.

 Wear a conductive wrist strap with a series 1-megohm resistor. If you do not have a wrist strap, touch a

ground briefly before touching any sensitive parts to discharge your body. Do this frequently while you

are working. You can collect a destructive static charge on your body just sitting at the work bench. DO

NOT attach a ground directly to yourself as this poses a serious shock hazard.

 Use a grounded anti-static mat on your work bench.

 If you choose to use a soldering iron to work on your K3 for any reason, be sure your iron has an ESD-

safe grounded tip tied to the same common ground used by your mat or wrist strap.

Preparing for Installation

Tools and Supplies Required

1. #0 and #1 size Phillips screwdrivers. To avoid damaging screws and nuts, a power screwdriver is not

recommended. Use the screwdriver that best fits the screw in each step.

2. Small pliers or a 1/4” nut driver.

3. Side (diagonal) cutters.

4. Long nose pliers.

5. Soft cloth or clean, soft static dissipating pad to lay cabinet panels on to avoid scratching.

6. Approximately 2.5” (6.4 cm) of transparent tape such as Scotch Magic

mending tape (will be used

as shown in Figure 44 on page 37).

The following tools are strongly recommended:

1. ESD wrist strap.

2. Static dissipating work pad.

You may need the following in order to install a single resistor on the main RF board (See Checking and

Modifying Resistor R91 and DAC Input Circuits on page 21 to determine if you will need to install this part.)

1. Digital multimeter capable of measuring in resistance values.

2. Fine-tip temperature-controlled ESD-safe soldering station with 700 to 800F tip (370-430C).

Recommend a spade tip approx. 0.05” (1.3 mm) wide. Do not use a high-wattage iron or soldering gun

since this can damage pads, traces, or the parts themselves.

3. IC-grade, small-diameter (.031”) solder (Kester #44 or equivalent).

DO NOT use acid-core solder, water-soluble flux solder, additional flux or solvents of any

kind. Use of any of these will void your warranty.

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Elecraft KRX3 User Manual Page 6