COMMON FAULTS FOUND ON THE FT290R ================================= NO RF O/P : PA ~~~~~~~~~~~~~~ If it is not PA (the most likely cause) then check diode D24 in aerial switching, check for L2012 physically shorting to copper screen, and check driver Q2021 and R69. OFF FREQUENCY RX + TX ~~~~~~~~~~~~~~~~~~~~~ If this is just a couple of KHz then realign PLL local osc. If it is several KHz (possibly 10-12) off frequency then suspect PLL local osc xtal X02 (18.7414MHz). OFF FREQUENCY FM TX ~~~~~~~~~~~~~~~~~~~ Realign L1002 (FM TX osc coil). If frequency error is significant then suspect xtal X1001. ERRATIC FREQUENCY JUMPS ~~~~~~~~~~~~~~~~~~~~~~~ Check X02 as above. DRIFTING ~~~~~~~~ Check -6.8v. rail, and check Q05 on REG unit if this is missing. POOR SQUELCH OPERATION ~~~~~~~~~~~~~~~~~~~~~~ Check Q1019 (MC3357P) and D32 in squelch circuitry. POOR QUALITY FM RX ~~~~~~~~~~~~~~~~~~ Xtal X1003 (11.265MHz). ERRATIC TUNING ~~~~~~~~~~~~~~ The tuning step switch. TUNING JUMPS ~~~~~~~~~~~~ The tuning step switch. INTERMITTENT TX+RX ~~~~~~~~~~~~~~~~~~ Check TX/RX relay. Check alignment of VCO in PLL. NO AUDIO O/P ~~~~~~~~~~~~ Check audio IC Q1027. Also check to see if the reverse polarity diode is blown, as reverse polarity causes failure of this IC. CONTINUOUS CW OR NO CW TX ~~~~~~~~~~~~~~~~~~~~~~~~~ Check Q2010 (MC14001B). Also check the wire to the key socket is not s/c or broken, as this can happen when the battery compartment is taken in and out. LOW SENSITIVITY RX ~~~~~~~~~~~~~~~~~~ Check T1001 Ae. i/p coil, D25 in aerial switching and RF amp. LOW SENSITIVITY ON A UNIT WITH A MUTEK BOARD ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Check for loose strands from the braid of the Mutek board's coax shorting out the connecting pins on the Mutek board. Then check BF980 in Mutek board. FADING LCD DISPLAY ~~~~~~~~~~~~~~~~~~ Dismantle LCD display unit and clean the rubber connecting strip and the PCB it makes contact to. CRACKLING NOISE ON TX AUDIO (FM ONLY) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Q2004 mic amp IC. CRACKLING NOISE ON TX+RX ~~~~~~~~~~~~~~~~~~~~~~~~ Check X3001 (5.76MHz) in PLL. MELTED NICADS ~~~~~~~~~~~~~ Replace DC i/p socket (and nicads). This fault can also occur as a result of using a DC input plug which is not quite the correct diameter or length, because the batteries are then not disconnected when DC is plugged in. POOR SSB TX (NON-LINEAR) ~~~~~~~~~~~~~~~~~~~~~~~~ If the PA has gone non-linear, then replace the PA and change R70 from 390R to 270R. (Downloaded from GB7SYP)