Yaesu FT-897 Manual page 2

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FT-897 Alignment
Nothing should be connected to the CW Key Jack. Switch
off the S1001.
Pre-Driver Stage Idling Current
a. Connect an ammeter at TP1019 and TP1010.
b. Press the PTT and adjust VR1004 for an indication of 30mA ±2mA on the ammeter.
Driver Stage Idling Current
a. Connect an ammeter at TP1007 and TP1008.
b. Press the PTT and adjust VR1003 for an indication of 20mA ±2mA on the ammeter.
Exciter Stage Idling Current
a. Connect an ammeter at J1004.
b. Turn both VR5401 and VR5402 fully to counterclockwise.
c. Press the PTT and adjust VR1002 for an indication of 100mA ±10mA on the ammeter.
d. Press the PTT and adjust VR1001 for an indication of 200mA ±10mA on the ammeter.
e. Connect the J1004 and switch on the S1001.
Local Oscillator Adjustment
2
nd
Local Adjustment
a. Connect a RF millivoltmeter or an oscilloscope to Q1038 5pin (TP1067).
b. Adjust T1024 and T1026 alternately for the maximum indication on the millivoltmeter or for the
maximum amplitude on the oscilloscope.
c. Confirm the indicated voltage is at least 120mVrms or 330mVp-p.
3ad Local Adjustment
a. Connect a RF millivoltmeter or an oscilloscope to Q1055 5pin (T1087).
b. Key the transceiver on CW mode and adjust T1021 for the maximum indication on the RF
millivoltmeter.
c. Confirm that the indicated voltage is at least 70mVrms or 200mVp-p.
TX IF Adjustment
SSB/CW
TX IF Adjustment
a. Tune the frequency to 14MHz band. Connect a RF millivoltmeter to TP1033 and J1002 terminated
by 50Q dummy load.
b. Key the transmitter and adjust T1033, T1023, and T1021 alternately for the maximum indication
on the RF millivoltmeter.
FM TX IF Adjustment
a. Tune the frequency to 28MHz band. Connect a RF millivoltmeter to TP1033 and J1002 terminated
by a 50Q dummy load.
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