ELECRAFT K2/100, Руководство пользователя

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Power output low: If power output is somewhat low across all bands, it
may be because you used an inaccurate wattmeter during calibration of
R26/R27. Other possibilities include incorrect bias adjustment (R6),
reversed or poorly-prepared leads on T4, or a T-R switch problem (check
D11-D14 and their voltages during transmit). If power is low on some
bands, check the low-pass filters as described under
Receiver Problems ,
above. Also note that many watt meters read too low on 160 meters even
if they read correctly on the other bands.
Key clicks: If your K2 s/n is 4059 or lower, you should install the K2
keying bandwidth mod (order #K2KEYMODKT). Also, some older
linear amplifiers have slow-switch relays that can cause clicks.
KPA100 Error/Status Codes
The "Exxx" PA menu setting can show up to 3 single-digit error/status
codes. Normally there will be none ("E "). The following codes are used,
alone and in combination:
1: PA is in QRP (bypass) mode. Usually appears with code 2 ("E12").
2: No 12V power supply connected to the KPA100. Usually appears with
code 1 ("E12").
4: The SWR became very high during transmit at or near full power,
typically because of a sudden change to an ATU setting or a shorted/open
antenna connector. This causes the K2 to reduce power to zero and show
"Hi Refl" on the LCD. The error code can be cleared by rotating the
POWER control. (Applies to KPA100 firmware rev. 1.04 or higher.)
7: The heat sink temperature reached 85 degrees C. This causes the K2 to
reduce power to zero and show "PA Hot" on the LCD. Both the warning
message and the E7 error code can be cleared by tapping any switch, then
rotating the POWER control (repeat if necessary). The fan will remain on
high until the heat sink temperature has dropped back below 37 degrees
C. (Applies to KPA100 firmware rev. 1.04 or higher.)
8: This code will always be seen after setting CAL TPA, but it can also
indicate a problem with the KPA100 MCU or its on-chip EEPROM. If it's
just the CAL TPA indication, it can be cleared by turning power off and
back on.
Codes 3, 5, and 6 are not presently used.
Miscellaneous
PA menu parameter missing: Make sure KPA100-U1 is not installed
backwards, and has no bent pins. Check all U1 voltages (see DC voltage
tables). Also check the KPA100-to-K2 ribbon cable.
INFO
messages : If you see
INFO 080
or a similar message on the
LCD, refer to the K2 Owner's Manual, Appendix E.
END message: This usually indicates that you are out of band.
Note: Transmit at high power is excluded between 25 and 28 MHz.
Fan stays on HIGH:
If the fan remains at high speed for more than 4
minutes after you stop transmitting, the amplifier transistors may be
getting too hot. You may have the bias pot (R6 on the KPA100) set too
high. Also check voltages in the bias circuitry. If these all check out OK,
chances are that Q1 and/or Q2 have been damaged and will need to be
replaced. Another possibility is that
CAL tPA has not been properly
calibrated (see page Temperature Calibration and K2 Current Limit Set
on page 49).
Missing 90-150 volt bias voltage or (-) RS-232 driver voltage:
The
most likely cause of this is a poorly prepared lead, or reversed leads, on
T3. Next, check diodes D1-D8. These are located on the bottom of the PC
board, but you can reach their pads from the top.
RS-232 I/O problems:
Loss of K2 to computer data communication is
often caused by a broken or poorly-soldered I/O connection, or by
incorrect setup of the computer program. Verify the baud rate (4800) and
related settings at the computer, and make sure the
P O RT menu entry in
the K2 is set to O N . Your software may require the CTS/RTS loopback.
Also, some PC programs work only under DOS, or require extra serial
port configuration steps. Some versions of Hyperterminal prevent local
character echo even if the appropriate box is checked.
Missing sidetone: The Control board modification changes the source of
the sidetone to pin 4 of U8. The K2 needs to be configured to recognize
the new source as explained under
RS-232 Interface Setup and Test on
page 61.