Modifications for the Yaesu
FL-7000
19-07-1998 FL-7000 10 meter transmit
mods
- Remove power and all other cables.
- Remove 4 screws from top cover.
- Remove top cover and right and left panels.
- Remove 4 screws from power combiner unit and remove screen plate.
- Locate switch so1 on the cpu unit and set to off position ( a small
screwdriver can be used to reach switch)
- Reassemble unit.
22-08-1998 FL-7000 desensitize the
protection circuitry
From: Howard Ryder
[email protected]
Most Yaesu FL-7000 Solid State Linears have a
hypersensitive protection circuit that causes the "protect" to trip when no
improper conditions exist. This modification will desensitize the protection
circuitry; but still allow it to function when an improper condition
exists.
The modification is as follows:
PROTECTOR UNIT
- Remove D7006 P/N HZ15-1L
- Remove R7029 P/N J02245102
- Remove R7033 P/N J02245104
- Remove Q7004 P/N G3107331Q
- Add R7060 Resistor 10K 1/4w P/N J01225103 This resistor must be added from
pin 7 of Q01 (1/2 of AN6552) to pin 5 of Q7003 (1/2 of AN6552)after removing
R33 10ohms.I carefully snipped the lead in the center and put my 10K in series
with the existing 10 ohm resistor.
POWER SUPPLY UNIT
- Replace C8019 P/N K13179009 WITH 1uf 50VDC P/N 59V010M5X11TR5.
This capacitor goes between the base and emitter of Q8008 P/N
2SC2229.
NOTE:
The positive lead goes to the base of the transistor.I
put mine in parallel with th existing 0.047.
ALIGNMENT OF NEW
CICUITRY
CM COUPLER
- Remove the ALC cable.
- Remove P06 (J04) on the Auto Tuner Relay Unit
- Key the driving radio in CW (FT-757, FT-767, etc)
- Adjust the power output to 400 watts
- Connect the Black lead of DC Voltmeter to pin 1 and the Red lead to pin 3
on the Protector Unit, OR connect the Black lead to ground and the Red lead to
TP01 on the CPU Unit (use the 0.25V range on the DC voltmeter)
- Adjust TC5001 for a MINIMUM reading on the DC voltmeter
- After adjustment, reconnect P06 and the ALC cable
PROTECTOR
UNIT
ALC METER AND ALC PROTECTOR ADJUSTMENT
- Set the ALC pot fully clockwise (CW)
- Apply +9VDC to TP7001
- Adjust VR7008 to the right edge of the ALC zone
- Set the ALC pot fully counter clockwise (CCW)
- No adjustment on the SWR Protector VR7004 is required.
IC PROTECT
ADJUSTMENT
- Connect the DC voltmeter to the center of VR7004
- Adjust VR7004 to 3.8VDC +/-0.1V
The correct resistor and capacitor
are available from Yaesu if you desire.
TB-9601- Yaesu
(562)404-2700