Module Troubleshooting
The K3 is a highly modular transceiver. With the information provided here, you’ll be troubleshooting to the
module level, not to the component level. In many cases, problems can be resolved by changing a menu setting,
loading new firmware (pg. 44) or initializingparametersto factory defaults (see below).
A full set of schematics can be found on our web site. Due to the use of fine-pitch ICsin the K3,most signal
tracing must be done very carefullyusing fine-tip probes.Please do not attempt this unless you have
experience in troubleshooting surface-mount assemblies; otherwise, you could damage your K3.
DO NOTADJUSTANY TRIMMER CAPACITORS OR POTENTIOMETERS unless you have
access to appropriate labtest equipment and have consulted Elecraft support regarding the proper settings. All
trimmers have been aligned at the factory, and if mis-adjusted could degrade performance.
Error Messages (ERR xxx)
An error message may be displayed on VFO B at power-up or during normal operation. In most cases error
messages are due to a problem with a single option module, and may be due to incorrect firmware configuration.
If you see an error message on VFO B (ERR XXX): Write down the error message, as well as any associated
error data shown onthe VFO A display (e.g. E 00005).Then tap any switch to clearthe error code. Multiple
errors may occur; in this case, write down each of the messages and VFO A data, if any, before you clear them.
See Error Msg table (next page) for details on specific ERR messages and their associateddata values.
Module Removal
TURN OFF THEPOWER SUPPLY OR DISCONNECT THEPOWER SUPPLY CABLEbefore
removing or installing modules. If you drop a metal tool inside the K3 with power still applied, you can
short a power supply or control line, resulting in damage to the RF board or other modules.
Module de-installation procedure: To see if an option module isthe cause of an error message, youmust de-
install it as described below, or you may not be able to tell if removing the module had any effect:
Turn off power
Removethe module
Set the associated CONFIG menu entry to NOT INST. (See CONFIG:KAT3, etc.) Note: If the affected
module is on the KRX3 (sub receiver), youmust tap SUB to display its configuration setting. Otherwise the
setting shown applies to the main receiver. This appliesto the KBPF3 and KNB3 modules, as well as crystal
filters, all of which are duplicated on the RF and sub receiver boards.
Turn power off and wait at least 5 seconds
Turn power back on
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