Yaesu FT-817 Service Manual
Alignment
1/10
FT-817 Alignment
Local Oscillator Adjustment
Reference Frequency Adjustment
a. Connect a frequency counter to J5002 2pin (TP1047).
b. Adjust the trimmer capacitor (TC5001) for 22.625000MHz +/- 5Hz on the frequency counter.
c. Connect a RF millivoltmeter or an oscilloscope to the J5002 2pin (TP1047) and confirm that the
output level is at least 70mVrms or 200mVp-p.
PLL Adjustment
VCO VCV Adjustment
a. Connect a DC voltmeter to J2002 6pin (TP1007) and referring to the table below, tune the
transceiver to each frequency listed. Then confirm that the correct voltage is present, or adjust the
listed components for the required voltage.
Tune to : Adjust / Confirm For
13.895MHz Adjust TC2003 4.5V +/- 0.1V
76.000MHz Confirm At least 0.5V
32.995MHz Adjust TC2002 4.5V +/- 0.1V
13.900MHz Confirm At least 0.8V
55.995MHz Adjust TC2001 4.5V +/- 0.1V
88.000MHz Confirm At least 0.8V
153.995MHz Adjust L2010 4.5V +/- 0.1V
108.000MHz Confirm At least 0.5V
469.995MHz Adjust L2011 4.5V +/- 0.1V
420.000MHz Confirm At least 0.8V
1st Local Output Level
a. Connect a RF millivoltmeter to J2002 11pin and tune the transceiver to 28.000MHz.
b. Confirm that the RF level is at least +5dBm or 400mVrms.
PLL Unlock
a. Connect a DC voltmeter to J2002 1pin (TP1001).
b. When the reference input is not activated, the voltmeter shows less than 0.5V and “UNLOCK” is
displayed on the LCD.
c. When the reference input is activated, the voltmeter shows at least 3.5V and LCD displays as it
normally should do.
YAESU MUSEN CO., LTD.
Alignment
2/10
PA Unit Adjustment
Before alignment, set the mode on CW and tune the transceiver to 1.800MHz. Nothing should be
connected to the CW Key Jack.
Driver Stage Idling Current
a. Remove the jumper connector J3005 and insert an ammeter.
b. Press the PTT and adjust VR3001 for an indication of 28mA +/- 2mA on the ammeter.
c. Disconnect the ammeter and reinstall the jumper connector at J3005
d. Remove the jumper connector J3006 and insert an ammeter.
e. Press the PTT and adjust VR3002 for an indication of 18mA +/- 2mA on the ammeter.
f. Disconnect the ammeter and reinstall the jumper connector at J3006.
Final Stage Idling Current
a. Connect an ammeter at each “13US” pin on PA Unit and Final Unit. If the “13US” line has
already been connected by a wire, remove it and connect an ammeter.
b. Turn both VR5401 and VR5402 fully to counterclockwise.
c. Press the PTT and adjust VR5401 for an indication of 38mA +/- 2mA on the ammeter.
d. Press the PTT and adjust VR5402 for an indication of 76mA +/- 4mA on the ammeter.
e. Connect the “13US” line between PA unit and Final Unit again as it should be.
Local Oscillator Adjustment
2nd 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
CW TX IF Adjustment
a. Tune the frequency to 1.8MHz band. Connect a RF millivoltmeter to J1002 terminated by 50ohm
YAESU MUSEN CO., LTD.
Alignment
dummy load.
b. Key the transceiver and adjust T1020, T1012, and T1005 alternately for the maximum indication
on the RF millivoltmeter.
3/10
FM TX IF Adjustment
a. Tune the frequency to 28MHz band. Connect a RF millivoltmeter to J1002 terminated by a 50ohm
dummy load.
b. Key the transceiver and adjust T1012 and T1013 alternately for the maximum indication on the
RF millivoltmeter.
c. Connect a frequency counter to TP1008.
d. Key the transceiver on FM mode without microphone input. Adjust T1018 for 68.3300MHz +/-
50Hz.
Carrier Balance Adjustment
a. Terminate J1002 by a 50ohm dummy load and connect a spectrum analyzer or a RF
millivoltmeter.
b. Key the transceiver on USB mode in 28MHz band without microphone input. Adjust VR1001 for
the maximum carrier suppression on the spectrum analyzer or for the minimum indication on the RF
millivoltmeter.
VHF TX BPF Adjustment
a. Set the frequency at 145.995MHz. Connect RF millivoltmeter to J1002 terminated by a 50ohm
dummy load.
b. Key the transceiver on FM mode and adjust T1011, T1010, and T1009 alternately for the
minimum indication on RF millivoltmeter.
UHF TX BPF Adjustment
a. Set the frequency at 439.995MHz. Connect a RF millivoltmeter to J1002 terminated by a 50ohm
dummy load.
b. Key the transceiver on FM mode and adjust TC1005, TC1004 and TC1002 alternately for the
minimum indication on RF millivoltmeter.
RX Adjustment
PA Unit must be connected in RX adjustment. Signal Generator should not be connected to J1002
directly because DC voltage comes on there.
YAESU MUSEN CO., LTD.
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