Yaesu: FT 2800 Quit Working Today

[Seven-Delta-FortyOne]

I bought this used a few years back as my first Ham radio, and I'm quite familiar with all the problems they are famous for, but this one seems different.

I had it in a cigar lighter plug, not transmitting, and suddenly the display started showing low voltage readings, then it flashed on and off, and finally died completely.

I've removed the cigar plug connector, and plugged it directly into my power supply, still dead.

What does this sound like? I'm not sure I want to take it in to the repair shop yet, as just getting it looked at will cost as much as I bought it for.


Delta

 

[K4EET]

I bought this used a few years back as my first Ham radio, and I'm quite familiar with all the problems they are famous for, but this one seems different.

I had it in a cigar lighter plug, not transmitting, and suddenly the display started showing low voltage readings, then it flashed on and off, and finally died completely.

I've removed the cigar plug connector, and plugged it directly into my power supply, still dead.

What does this sound like? I'm not sure I want to take it in to the repair shop yet, as just getting it looked at will cost as much as I bought it for.


Delta

Have you actually checked the voltage output of the power supply under load?

73, Dave K4EET

 

[Seven-Delta-FortyOne]

Oh yea. It's currently running my FT-897. I tested the cigar lighter connector as well. Ran my TK-880 just fine.

It's odd that this happened without any transmitting going on, and that it suddenly started giving low voltage readings.

I would understand it there had been a voltage spike. Could have fried something.



Delta

 

[mm]

This sounds like one of the many the common FT2800 problems where the reference crystal oscillator dies.


I had one that would flash the display for several seconds then the unit appeared dead with no flashing display at all then I had a 2nd one that i repaired that was outright dead with no flashing display at all and both were traced to the reference crystal.

The Reference crystal, X301 21.25MHz, has failed. It is a ~6 dollar item from yaesu parts.


You can confirm the failure by going to the below link for the service manual and removing X301 on your radio.

To confirm that X301 is bad you need to inject a -4 to 0 dbm signal set to 21.25 Mhz CW mode from a stable external generator into one of the holes where X301 was soldered to, if the crystal was bad then your radio should start working.


Try injecting at both of the remove crystal holes as I don't remember which it is but it should be easy to figure out.


The VERTEX part number for X301 is >>> S8101424, DESCRIPTION >> 21.25 MHz crystal.


Yaesu parts dept. number 714-827-7600 8AM-5PM PST


Go here for the 2800 manual and to see where X301 is located at on the circuit board.


If X301 checks fine then this could also be X101 on the processor going, why Vertex has so many issues with their crystal vendor is beyond me.

http://www.repeater-builder.com/yvs/pdfs/yaesu-ft-2800m-technical-supplement.pdf

 

[Seven-Delta-FortyOne]

Thank you very much for all that info!!


Delta