I was wondering if anyone could tell me what might cause my ft897 when turned on the screen just flashes and there is no sound, you can change freq. but get tx-error when trying to transmit. it just started this when I turned it on, has been doing great job for awhile now. I have ask a few and they suggested it might be a pll circuit falure or a reference oscillator falure. I was also courious if the 897 would operat without the optional tcxo-9 that is installed.
The 897/857 rigs are notorious for the upper and lower mainboard fastening screws loosening up over time due to slight warping of the chassis as the extruded chassis warms up and cools down. This results in poor ground paths for whatever circuit is near the loose hardware fastener. The symptoms of this can range from what you are reporting to full power parasitic oscillations on transmit. Remove the top and bottom covers and tighten all the screws that fasten the RX and TX mainboards to the chassis. When I figured out this was the cause of the random strange behaviors with my 897D I installed lockwashers under the fasteners and that was the end of the problem.
Another issue that can cause problems similar to what you are describing is caused by the rig inadvertently being powered up while in the transmit mode. This frequently happens when the plug for a cw key is plugged into the back panel jack but is not fully seated. The rig does not initialize properly when this happens and the results of this can be anything from an apparent dead radio to one that will not TX and has most of the front panel controls inactive.
If your issue is not related to the two items above, try a full reset to see if that restores full functionality.
Not sure why you would want to remove the tcxo but it will function without it. Early models did not have that installed unless it was ordered as an option. Later models seemed to have it installed without the need to add it as an option.
Rob W1AEX -- "The dog days are over... The dog days are done..."