Yaesu FT-897 Technical Supplement page 16

Alignment
Power Amplifier Adjustment (Lot. 69 ~)
HF/50 MHz Idling Current Adjustment
Tune the transceiver to any HF band, or to the 50 MHz
band.
Disconnect the wire jumper from TP3021 and TP3022
on the PA Unit, then connect the ammeter between
TP3021 (+) and TP3022 (–).
Turn VR3001 fully counterclockwise.
Press the PTT, and adjust VR3001 for an indication
of 600 mA (±10 mA) on the ammeter.
Disconnect the ammeter, and re-connect TP3021 and
TP3022 using the wire jumper.
V/UHF Idling Current Adjustment
Tune the transceiver to the 430 MHz band.
Disconnect the wire jumper from TP3021 and TP3022
on the PA Unit, then connect the ammeter between
TP3021 (+) and TP3022 (–).
Turn VR3002 fully counterclockwise.
Press the PTT, and adjust VR3002 for an indication
of 1000 mA (±50 mA) on the ammeter.
Disconnect the ammeter, and re-connect TP3021 and
TP3022 using the wire jumper.
TP3021
TP3022
TP3001
VR3002
16
PA Unit ( Lot. 69 ~ ) Alignment Points
Directional Coupler Balance Adjustment
Terminate the antenna jack into a 50-Ohm dummy load.
Set the mode to CW, and connect the DC voltmeter to
TP3001.
Tune the transceiver to the 28 MHz band, and key the
transceiver.
Adjust TC3002 for minimum indication on the DC
voltmeter.
Tune the transceiver to 439.995 MHz, and key the trans-
ceiver.
Adjust VR3003 for minimum indication on the DC
voltmeter.
Leave the transceiver on 439.995 MHz band and key
the transceiver.
Adjust TC3001 for maximum indication on the RF
Power meter.
TC3002
VR3003
TC3001
VR3001