Yaesu FT-897 Technical Supplement

Also see for FT-897: Manual Brochure & specs Operating manual Service manual Operating manual

Contents

12AlignmentPLL Unlockr Connect the DC voltmeter to pin 1 of J2002 (TP1027).r Disconnect the reference oscillator input by unplug-ging the cable; confirm that the voltmeter shows lessthan 0.5 V and that “UNLOCK” is displayed on theLCD.r Re-connect the reference input, and confirm that thevoltmeter shows at least 3.5 V and tat the LCD returnsto its normal display.Idling Current AdjustmentBefore alignment, set the mode to CW and tune thetransceiver to 1.800 MHz. Nothing should be connectedto the CW Key Jack. Switch off S1001.Pre-Driver Stage Idling Currentr Connect the ammeter between TP1019 and TP1020.r Press the PTT, and adjust VR1004 for an indicationof 35 mA (±2 mA) on the ammeter.Driver Stage Idling Currentr Connect the ammeter between TP1017 and TP1018.r Press the PTT and adjust VR1003 for an indication of30 mA (±2mA) on the ammeter.Exciter Stage Idling Currentr Terminate J1004 into a ammeter.r Turn both VR1001 and VR1002 fully counterclock-wise.r Press the PTT and adjust VR1002 for an indication of100mA (±10 mA) on the ammeter.r Press the PTT and adjust VR1001 for an indication of200mA (±10 mA) on the ammeter.r Re-connect J1004 and switch on S1001.TX IF AdjustmentSSB/CW TX IF Adjustmentr Tune the frequency to the 14 MHz band. Connect theRF millivoltmeter to TP1033, and terminate J1002into a 50-Ohm dummy load.r Inject a 1 kHz tone at 1 mV level to the MIC jack.TP1027S1001 TP1017TP1018TP1019TP1020VR1003VR1004VR1002VR1001J1004TP1033T1033J1002T1014T1021T1023L1049VR1005T1013 T1012 T1011J1003r Key the transmitter, and adjust T1033 for maximumindication on the RF millivoltmeter.GNDPTTMICMIC GND