Resetting the CPU
The FT-2400H has three levels of resetting: memory-only, all-setting soft reset, and all-set-
ting hard reset:
To reset only the memories, hold the F/W and D/MR buttons while switching the set on.
Your step,
repeater shift and other setting will be re-tuaniend, while the memories will be cleared.
To clear all setting to their factory defaults, hold D/MR and REV SKIP while turning the
transceiver on. Then turn the transceiver off and hold only D/MR while switching it back on
again. If for some reason this fails, you can perform a hard reset by removing the top cover,
and shorting across the split solder pad on the circuit board exposed on the inside of the front
panel, just behind the top left corner of the display. Then hold D/MR while switching on.
Memory Backup
Normally, a lithium battery inside the transceiver retains all settings and memories while
power is off or disconnected. If the transceiver looses its memories (but still operates prop-
erly), this battery should be replaced.
The front panel must be removed to gain access to the battery, which is on the inside of the
front panel, just behind the memory box on the display. It should be replaced only be an
Yaesu-authorized technician to ensure that it is installed properly.
Memory Cloning
All memory data stored in one transceiver can be moved to another by connecting the mi-
crophone jacks together with the optional cloning cable, available from your Yaesu dealer.
O Turn both transceivers off, and connect the mic jacks together. Press and hold the F/W
buttons while turning the power switches on. All segments of the displays will be on.
O Press the REV SKIP button on the destination transceiver (the display will show "C-Rx"
in place of frequency).
O Press the RPT button on the source transceiver. The display will show "C-Tx" while the
data is being transferred, and should then return to normal. If "Err" appears on the destination
display, turn both transceivers off and try again. If the display of the destination transceiver
remains all blank or all on, and you cannot turn the transceiver off, press the PTT switch (the
display will change to "Err", and then hit the power switch to return to normal operation. Re-
check your cable, and then try again.
O Turn both transceivers off and remove the cloning cable.
Packet Radio
Packet radio operation with the FT-2400H requires a later-model tnc with a PLL-tpe BCD
circuit, since there is no readily-accessible squelch status output from the radio to tell the tnc
when the channel is clear. Connections between the tnc and the microphone jack of the FT-
2400H can be made as indicated in the table below.
You must use an 8-pin modular telephone-type plug for the mic jack connections. Use
shielded cable for the audio lines, and keep it as short as possible to avoid RF pickup.
"radio" Jack on TNC
FT-2400H Mic Jack Comment
Receiver Audio in
pin 2
8 ohms, de-emphasized
PIT out
pin 3
ground to transmit
Transmit Audio out
pin 4
400 ohms, pre-emphasized
Ground
pin 5
Audio signal ground
Internal Adjustments
Inside the top cover are several adjustments that you may wish to make to match the trans-
ceiver to your operating requirements (the top cover can be removed as described on the next
page). You can adjust the volume of the button beeper (relative to the front panel VOL
control) by the BEEP trimmer, and medium and low power output levels by the MID and
LOW trimmers if you have a VHF wattmeter. See the Caution box below.
Caution!
The other trimmers inside the front panel should not be adjusted without
the proper test equipment. Doing so could degrade performance, or even
damage the transceiver, and will void your warranty. Ask your Yaesu
dealer for help if you need any other adjustments made.
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