FT77 faults =========== NO TX : Check the 2R2 resistor in series with the TX 13.8v switching transistor. This is mounted on the small power PCB in the rig. NO RX : Check the 2R2 resistor in series with the RX 13.8v switching transistor. CB DE-MODIFICATION : These rigs were sometimes converted for illegal CB use. This usually involved replacing 28.5-30MHz with 26.5-28MHz. A few rigs may still be around in this state, and will require re-converting back to 10 metres. This will require the replacement of the local oscillator crystals, and re-alignment. Re-alignment should not be omitted, as the rigs may intermittently fail to operate correctly if it is. To convert back from 26.5-28.5MHz operation use the following procedure: 1. Fit the correct xtals in the 28B, C and D positions, and align the HF oscillators on those bands. Alignment of the VCOs is a little critical after this, they should be aligned so the VCV line (the control voltage fed to the VCOs) does not go much outside the range 2 to 6.75v on any of the four 28-30MHz positions, at either the low or high frequency end of each band. If the VCOs go out of lock the display will blank, and if you do not align them carefully then the VCO locking will be intermittent at band edges. It is a little difficult to identify the VCV line as no test point is provided - I used to measure it on the centre of one of the grey coax cables that run down the left hand side of the board. 2. After this the RF tuned circuits should be peaked at approx 29MHz. (Downloaded from GB7SYP)