Elenos ETG 1000W Repair

[BriansBrain]

Managed to get one of these older type Elenos ETG1000 1000W 22kG monsters at a reasonable price

ETG1000-1.JPG

It powers up, the display and fans work, BUT no RF output at all
Low voltage PS = OK.
48V PS goes form 30V > 50V when you attempt to set the power output level.

LPF looks fine

ETG1000 - Low-Pass Filter.JPG

50V 48A PS is a monster

ETG1000 - PS-2.JPG

15W driver & 4 x 300W main out put stages

ETG1000 Driver + 4 Final.JPG

I am cleaning and looking for clues to the no RF out

[BriansBrain]

Driver board is suspect, voltages check out OK.

Driver.JPG

RF in from the mother board = 1V P-P
Input to the BLF404 = 5V P-P
BLF404 output = 0V P-P

Driver Voltages.jpg

Suspect BLF404 = Ordered
I will change the ERA-5 as well while the board is out

[BriansBrain]

Driver board, cleaned and the BLF404 & ERA-5 removed.

The BLF404 tested Gate Open Circuit

Driver - BLF404 & ERA-5 removed.JPG

[3metrejim]

Gate will be open circuit on a mosfet transistor. I'd apply 12v with the transistor removed and check the gate bias voltage (0.44v seems a little on the low side) and that all of the biasing components test ok.

[BriansBrain]

Gate will be open circuit on a mosfet transistor. I'd apply 12v with the transistor removed and check the gate bias voltage (0.44v seems a little on the low side) and that all of the biasing components test ok.

Correction, I should of mentioned I tested it with one of these things

Capture.JPG

[3metrejim]

I guess that would do it. Nice transmitter, even if old - looks like it's had some dust and sea air exposure. Is that harmonic filter constructed with pcb capacitors? If so, I guess it must be a teflon loaded board.

[rigmo]

is this possible crack?

[radium98]

seems to me no , not a crack , but something in dead rf caps.

[BriansBrain]

is this possible crack?

Not a crack = No

I inspected the board with a glass - it's perfect for it's age

[BriansBrain]

I guess that would do it. Nice transmitter, even if old - looks like it's had some dust and sea air exposure.

Got myself a 500W Air Duster and cleaned loads of it out already

Is that harmonic filter constructed with pcb capacitors? If so, I guess it must be a teflon loaded board.

I assume so

[BriansBrain]

As a matter of interest here is the User and Maintenance Manual
Complete with Circuits and PCB layouts

Capture.JPG

LINK >
https://www.dropbox.com/s/uu292hluebd25 ... 8.pdf?dl=0

[sinus trouble]

Nice bit of kit Brian!

I think its great that you are giving new life to something which may have been destined for the bin!

Dont know much about those transmitters? But i guess if the "Digital" side is still intact, Rectifying the problem is entirely doable!

[BriansBrain]

I think its great that you are giving new life to something which may have been destined for the bin!

I am actually after a good second hand more Modern Indium version of this Elenos transmitter
But in the meantime if I can get this one going it will do for now and... for a future spare TX

Dont know much about those transmitters? But i guess if the "Digital" side is still intact, Rectifying the problem is entirely doable!

Yes...according to many posts on the facebook Elenos Group Community page
if the "Digital" board is OK it can be repaired as long as the power supply is OK

[rigmo]

everything can be fixed. Today, the biggest challenge for engineers is that things last exactly as long as they predicted... old mosfets and good cooling can literally work for decades! without failure! those who say outdated etc. are only in their interest to sell new! because the seller has at least 25% if not 40% of the device!

[jvok]

Looking at the schematic even the digital section is easily repairable as long as the eeprom that holds the firmware isn't toast. Even then you might be able to get a new firmware image for it.

Power supply looks repairable too but obviously you'd have to be comfortable working on mains powered switchers

[rigmo]

I think its great that you are giving new life to something which may have been destined for the bin!

I am actually after a good second hand more Modern Indium version of this Elenos transmitter
But in the meantime if I can get this one going it will do for now and... for a future spare TX

Dont know much about those transmitters? But i guess if the "Digital" side is still intact, Rectifying the problem is entirely doable!

Yes...according to many posts on the facebook Elenos Group Community page
if the "Digital" board is OK it can be repaired as long as the power supply is OK

why aren't you closer, I would fix it for free! except for parts of course.

[BriansBrain]

Power supply looks repairable too but obviously you'd have to be comfortable working on mains powered switchers

Problem with the power supply I have is the circuit diagram is NOT available.
Well I can't find it an way

The PS in the Service Manual I have and posted is for the 1.6kW.

The PS I have in the TX is the more modern 2,5kW EPSU2K5PZ001

ETG1000 - PS-0.JPG

ETG1000 - PS-1.JPG

[BriansBrain]

why aren't you closer, I would fix it for free! except for parts of course.

Thanks for the offer

I have all the gear to fix it that's if I have still have the eye sight and the hands (Cataracts and Arthritis).

BTW: BLF404 and ERA-5 spare parts I ordered arrived today

Time to get the soldering station out I think

[jvok]

After youve fixed it id get a can of air (or an air compressor if you have one) and blow all the dust out. Especially that psu looks filthy

[BriansBrain]

After youve fixed it id get a can of air (or an air compressor if you have one) and blow all the dust out. Especially that psu looks filthy

Got myself one of these 500W Air Dusters job already done

Capture.JPG