LA9PJA - Yaesu FL-7000 Linear Amplifier.

LA9PJA - Yaesu FL-7000 Linear Amplifier.
LA9PJA - Yaesu FL-7000 Linear Amplifier.
FL-7000 Amplifier
Antenna Output Selector Repair
Photo of the Author's FL-7000 Linear Amplifier, before repair.
Photos by Carlos Ferreira.
Copyright © 2006
My FL-7000 Output Selector Repair.
In August 2006 while installing an antenna switch at my tower,
I found out that the antenna selector ports on the back of my FL7000 Linear Amplifier weren't working porperly. So after contacting
Bill Grassa, I got the amp manuals and the values wich should be
outputed from the selectors, wich again confirmed my suspicious
findings that there was something wrong.
After checking the readings, I oppned the amp as the photos on the
right shows using the following procedure:
1 - Removed the side rails, top and bottom covers.
2 - Removed the end trim pieces and screws holding the front panel.
3 - Removed the top front panel screws on the sides to allow the
front panel to “swing” open.
4 - While the front panel was resting 90 degrees from the chassis, I
had now access to the processor board that is mounted on the front[2/25/2009 3:11:00 PM]
LA9PJA - Yaesu FL-7000 Linear Amplifier.
5 - Removed the 3 pcs. (2SA733A) transistors found at Q004, Q005
and Q006 positions.
6 - Replaced Q004, Q005 and Q006 with 3 new (2SA733A)
7 - Attached the front panel into place by performing the above
procedures on 1, 2, 3 and 4 but in reverse this time.
8 - Connected the amplifier to the control cable of the FAS-1-4R
Remote antenna Switch and tested the antenna selector on the
9 - The selector was now working and selecting the correct antennas
inputs into the FAS-1-4R Switch.
10 - Closed down the remote switch and installed up on the mast
and again made a new test, now the antenna selector was working
properly and swithcing into the right antennas, either manually or
in automatic mode from radio.
Again, I would like to credit this repair to Bill Grassa for his
technical support via e-mail from St. Cloud, FL - USA.
Technical Documents:
FL-7000 Manual
FL-7000 Schematics
FL-7000 Schematics 1
FL-7000 Schematics 2
FT-1000 Series Band Data cable
FT-800 & 900 Series Band Data cable
Housings, Plug & Receptacle 9 circuit
Molex: Crimp Terminal Female for 24 -> 30 GA wire
8 Pin: Mini-DIN Plugs
Datasheet 2SA733
Datasheet SC2652
FAS-1-4R Wiring.[2/25/2009 3:11:00 PM]
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