[Yaesu] FT-2400

[Bob Allen]

Had the same thing happen to my FT-2400 about 18-24 months ago. 
Resetting the cpu fixed it for a while but it kept coming back, I 
finally replaced the memory backup battery and the problem went away. 
This doesn't mean the problem was the batt. but maybe disassembling and 
reassembling the unit cleaned some connector that was getting corroded.
The other problem I had with this unit was the PA, a SAV24 , the radio 
stopped transmitting one day but didn't show any signs of trouble (I 
stopped getting into the repeater one day). A quick check w/a watt meter 
showed no output (the s meter on the display showed full scale).
I was fortunate to get a copy of the schematic (which is on the web) and 
found that there was a break in the solder on the ceramic substrate 
board of the PA module. To access the module's circuit pry off the 
plastic cover, be careful with the leads from the module as they break 
easily.
Examine the module w/ a magnifier to look for a break in the solder 
trace, if this doesn't work then use a voltmeter along the traces while 
keying up on low power until you see a dramatic change in levels, the 
break will be obvious.
Repairing the broken solder will need a 30-40 watt iron and a steady 
hand as the ceramic substrate is quite a heat sink!
Hope this helps
Bob
KB1FRW

Rick Tucker wrote:t it kept coming back

>My FT-2400 was working just fine when the display turned to garbage -- asterisks, bars etc.  It was still on frequency and working fine. I do not think it is the memory backup battery.  Any suggestions?
>Rick W0RT
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