Permabanned
I have just bought a used Yaesu FTV-901R transverter off Ebay and when it
arrived I had a quick look inside.Two of the power supply
electrolytics have leaked leaving a hard yellow /brown residue on the
PCB. I was going to re cap this, as well as my FT-902FM, so no big
deal. The PCB tracks look undamaged, so far. What is the best way to
remove this stuff, mechanical abrasion or some sort of liquid
"solvent"? I have re-capped several devices, but been fortunate enough
to have caught them before leakage of this scale was evident.
More worryingly someone has removed quite a few components from the
144 MHz plugin and replaced them with a wired daughter board rather
shoddily fitted on adhesive foam rubber strips. There is a user /
service manual with this FTV901R with some ex owner notes in it, and
on a loose sheet of paper, documenting what's been removed. All bar an
inductor are common discrete components, and one semiconductor. It
looks like he could not get the correct semiconductor and has modded
the circuit to use something else. I have a source for the original
semiconductor, and I doubt the other items will be an issue except for
the tunable inductor. Do I attempt to put this back to stock, find
another un-messed with plugin, or tidy up what's there and hope he
knew what he was doing? For anyone with one of these transverters its
the 3SK51 device on page 17 of the manual, bottom centre of the
schematic, with surrounding devices. I think it's a dual gate MOSFET. What's the chances of
getting a good 144 MHz plugin on its own, or getting hold of the
missing inductor coil?
The manual is at:
http://www.foxtango.kc9foz.com/FT101ZD-901-902/FTV-901R.pdf
Photos of the mod are at http://www.gatesgarth.com/144plugin/144.html
Further deciphering of the previous owner's notes suggest he removed QO6 and replaced the existing 3SK51 dual gate MOSFET with a similar device , a BF900, and also removed TO4 variable inductor, and C31, C32, R29, R28, and R27, fitting in their place a daughter board stamped 144PA4 copyright 1981. He also removed the QO5 device altogether, the daughter board appears to NOT have any similar MOSFET on it at all. Anyone recognise this daughter board or able to suggest why this has been done?
Thanks for reading. I am also looking for a known good 50 MHz plugin
for this transverter.
{I am posting the above to this Overclockers thread in the hope someone recognises the daughter board, I have also posted to a Yaesu historic forum, hence the specifics}
arrived I had a quick look inside.Two of the power supply
electrolytics have leaked leaving a hard yellow /brown residue on the
PCB. I was going to re cap this, as well as my FT-902FM, so no big
deal. The PCB tracks look undamaged, so far. What is the best way to
remove this stuff, mechanical abrasion or some sort of liquid
"solvent"? I have re-capped several devices, but been fortunate enough
to have caught them before leakage of this scale was evident.
More worryingly someone has removed quite a few components from the
144 MHz plugin and replaced them with a wired daughter board rather
shoddily fitted on adhesive foam rubber strips. There is a user /
service manual with this FTV901R with some ex owner notes in it, and
on a loose sheet of paper, documenting what's been removed. All bar an
inductor are common discrete components, and one semiconductor. It
looks like he could not get the correct semiconductor and has modded
the circuit to use something else. I have a source for the original
semiconductor, and I doubt the other items will be an issue except for
the tunable inductor. Do I attempt to put this back to stock, find
another un-messed with plugin, or tidy up what's there and hope he
knew what he was doing? For anyone with one of these transverters its
the 3SK51 device on page 17 of the manual, bottom centre of the
schematic, with surrounding devices. I think it's a dual gate MOSFET. What's the chances of
getting a good 144 MHz plugin on its own, or getting hold of the
missing inductor coil?
The manual is at:
http://www.foxtango.kc9foz.com/FT101ZD-901-902/FTV-901R.pdf
Photos of the mod are at http://www.gatesgarth.com/144plugin/144.html
Further deciphering of the previous owner's notes suggest he removed QO6 and replaced the existing 3SK51 dual gate MOSFET with a similar device , a BF900, and also removed TO4 variable inductor, and C31, C32, R29, R28, and R27, fitting in their place a daughter board stamped 144PA4 copyright 1981. He also removed the QO5 device altogether, the daughter board appears to NOT have any similar MOSFET on it at all. Anyone recognise this daughter board or able to suggest why this has been done?
Thanks for reading. I am also looking for a known good 50 MHz plugin
for this transverter.
{I am posting the above to this Overclockers thread in the hope someone recognises the daughter board, I have also posted to a Yaesu historic forum, hence the specifics}
