Antenna Tuner Adjustment; Final Stage Idling Current Adjustment; Termination - Yaesu FTDX3000 Technical Supplement

Final Stage Idling Current Adjustment

 Connect the DC ammeter between J5008 and
J5009 on the PA-A Unit.
 Rotate the Main Tuning Dial knob to select the
alignment parameter "8-04 F1".
 P r e s s t h e P T T b u t t o n , t h e n a d j u s t t h e
[CLAR(VFO-B)] knob so that the DC ammeter
reading is "2.5 A (±50 mA)".
 Release the PTT button.
 Rotate the Main Tuning Dial knob to select the
alignment parameter "8-05 F2".
 P r e s s t h e P T T b u t t o n , t h e n a d j u s t t h e
[CLAR(VFO-B)] knob so that the DC ammeter
reading is "2.5 A (±50 mA)".
 Release the PTT button.

Termination

 Press and hold in the [MENU] button for one
second to save the new settings and exit the
alignment mode.
 Disconnect the 50-Ohm resistors from J5001
and J5007, then connect the coaxial cables to
J5001 and J5007.
 Re-connect the jumper plugs to J5008 and J5009.
PA U A
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J5008
J5009
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lignment oints
ALIGNMENT-13

Antenna Tuner Adjustment

CM Coupler Balance Adjustment
 Connect the 50-Ohm Dummy Load and Watt-
meter to the "ANT 1" jack.
 Connect the Digital DC voltmeter (high-Z) to
pin 3 of J5506 on the TUNER Unit.
 Turn off the [TUNE] switch, then set the VFO-A
frequency to 24.900 MHz in the CW-USB mode.
 Press and hold in the [1.8(1)], [3.5(2)], and [7(3)]
keys, while turning the radio on, to enter the
alignment mode.
 Rotate the Main Tuning Dial knob to select the
alignment parameter "9-08 I-ALC 24".
 P r e s s t h e P T T b u t t o n , t h e n r o t a t e t h e
[CLAR(VFO-B)] knob for 50 Watts on the Watt-
meter.
 Adjust TC5501 on the TUNER Unit for mini-
mum deflection on the DC voltmeter (less than
0.1 V).
 Release the PTT button, then press the [MENU]
button momentarily to exit the alignment
mode.
Pin 3 of J5506
tUneR U
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FT 3000 Technical Supplement
DX
Alignment
TC5501
A P
lignment oints