Yaesu FT-897 Technical Supplement page 12

Alignment
PLL Unlock
r 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 less
than 0.5 V and that "UNLOCK" is displayed on the
LCD.
r Re-connect the reference input, and confirm that the
voltmeter shows at least 3.5 V and tat the LCD returns
to its normal display.
Idling Current Adjustment
Before alignment, set the mode to CW and tune the
transceiver to 1.800 MHz. Nothing should be connected
to the CW Key Jack. Switch off S1001.
Pre-Driver Stage Idling Current
r Connect the ammeter between TP1019 and TP1020.
r Press the PTT, and adjust VR1004 for an indication
of 35 mA (±2 mA) on the ammeter.
Driver Stage Idling Current
r Connect the ammeter between TP1017 and TP1018.
r Press the PTT and adjust VR1003 for an indication of
30 mA (±2mA) on the ammeter.
TP1027
T1014
L1049
T1023
VR1005
T1033
12
TP1033 T1021 T1013 T1012 T1011
Exciter Stage Idling Current
r Terminate J1004 into a ammeter.
r Turn both VR1001 and VR1002 fully counterclock-
wise.
r Press the PTT and adjust VR1002 for an indication of
100mA (±10 mA) on the ammeter.
r Press the PTT and adjust VR1001 for an indication of
200mA (±10 mA) on the ammeter.
r Re-connect J1004 and switch on S1001.
TX IF Adjustment
SSB/CW TX IF Adjustment
r Tune the frequency to the 14 MHz band. Connect the
RF millivoltmeter to TP1033, and terminate J1002
into a 50-Ohm dummy load.
r Inject a 1 kHz tone at 1 mV level to the MIC jack.
MIC GND
r Key the transmitter, and adjust T1033 for maximum
indication on the RF millivoltmeter.
S1001 TP1017
MIC
PTT
GND
VR1004
VR1003
TP1018
TP1019
TP1020
VR1002
VR1001
J1004
J1002
J1003