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Yeasu FT-990 runnaway power
I recently acquired a "dead" Ft-990.
I got the receiver running and found I had a bad T/R relay, got that replaced, now I have 100++ power out on all bands no matter where the RF Pwr knob is set. I have come a long way from a dead transceiver, but the rig is still unusable as is since the output cannot be adjusted. I did see a voltage change from ~-6 volts to about +.3 volts at a test point shown in the service manual. I thought I'd drop a quick note in here to see if someone may have run into a similar issue with the 990 in the past. I THINK the problem is on the RF card, but am not sure. The service manual is great for schematics and part numbers, but is seriously lacking in theory. Anyhow, any help / suggestions would be great. remove the "spam" to email me directly, if you like. Ron E. W0IFL |
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