Elecraft KX1 Manual - Manual (Page 89)

E-2
03 No audio ƒ See Receiver troubleshooting table (60)
05 Current drain is
excessive on receive ƒ Check regulated voltages (20); look for a
component that’s warm to the touch
06 Supply voltage
drops when KX1 is on ƒ Check receive-mode current drain (05)
ƒ Battery not fully charged
07 Error in actual vs.
displayed frequency ƒ See Operation section ( CAL menu entry)
08 Freq. drift or
instability ƒ See VFO troubleshooting table (40)
09 EEPROM
initialization pending ƒ E09 on display: See Advanced Operating
Features, Resetting to Factory Defaults
10 EEPROM was
just initialized ƒ You may see E10 one time on power-up, or
if you install a new version of the firmware.
All KX1 parameters are set to defaults.
15 END or P=0 is
displayed on keydown
ƒ END : TX out of range (see specifications)
ƒ P=0 : CW test mode (see PLY menu entry)
Display and Control Circuits (20-39)
Problem Troubleshooting Steps
20 Regulated
voltage(s) incorrect ƒ DC input voltage must be > 6.5V
ƒ Unplug KXAT1 ATU option and re-check
ƒ If +6V is too low (< 5.7V) go to 22
ƒ If +5V is too low (< 4.7V) go to 23
ƒ If +2.7V is too low (< 2.5V) go to 23
21 General problem
with switches or
potentiometers ƒ Check switch resistance open/closed; RP2
may be in backwards
ƒ Check resistance of potentiometers
22 +6 V too low
(< 5.7V) ƒ Remove KXAT1 ATU option and re-check
ƒ Inspect 6V path on the KX1 PC board
ƒ Check for U9 installed backwards
ƒ Lift other component leads on the 6V line as
needed to find cause of excess loading
23 +5V too low
(< 4.7V) or +2.7V too
low (< 2.5V) ƒ Remove U1 from its socket
ƒ Check for U8 installed backwards
ƒ Check for U7 incorrectly installed (surface
mount--use magnifying glass)
ƒ Use techniques given for 6V regulator
(above)
24 LED display
problem ƒ DS1 backwards; check for shorts to ground
on each pin
ƒ MCU pin bent or broken (U1)
ƒ RP1 pin not soldered or shorted
25 Relay Problem ƒ Relays not soldered
ƒ Check relay coil resistance, pins 1 and 8
ƒ U3 (TC4427) defective or backwards (27)
26 Possible MCU
problem ƒ Check all DC voltages on U1
ƒ Make sure U1 is not backwards, has no bent
pins, and is seated firmly in its socket.
ƒ Check oscillator components (X1, C24, C25,
R22)
ƒ Also see (33) if you suspect an error in a
menu parameter, etc.
29 AuxBus problem
(no communication
with KXAT1 ATU) ƒ Look for short at J6 pin 5, U1 pin 2, or
KXAT1-U1 pin 17
ƒ Check voltage on J6 pin 5 (see table)
30 EEPROM test #1
failed
31 EEPROM test #2
failed
32 EEPROM data
error ƒ If you E30 , E31 or E32 on the LED, one
of the EEPROM tests has failed. CW
memories cannot be used. Parameters will be
set to defaults, and band 1 will be selected.
ƒ Try a full reset (33)
ƒ U1 may be damaged or inserted backwards
33 Configuration data
or menu problem ƒ If a menu parameter is out of range or can’t
be modified, EEPROM may need to be
reinitialized. See Advanced Operating
Features