Owner`s manual

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