Products > Test Equipment
Marconi Adret 742B RF signal generator
e_pigreco:
Hi,
I know is a bit an old post, but it seems that also myself need help on the same Adret Signal Generator.
I am replacing some tantalums which seem to have exploded but I need a full manual with schema all the schemas. As said by other people the downloadable version is missing some boards.
Can someone help me to identify the values of the popped tantalums in the photo, just taken from my 742 device ?
I already changed the C716 tant on the amplifier output board which was exploded and now I found also these tantalums exploded and I think this is the Attenuator board.
George Edmonds:
Hi
I have the final printed copy of the Adret manual from Marconi. There is no schematics for the attenuator in it, it was very probably a factory exchange only item, just a parts list. All Tantalum capacitors used are either 16uf or 22uf at 16VDC. Suggest you up them all to a higher working voltage.
Have you changed the Saft Nicad backup battery on the CPU card, they all leak and damage/destroy the CPU card
George G6HIG in Dover UK.
PerArdua:
--- Quote from: e_pigreco on June 28, 2020, 04:03:28 pm ---Hi,
I know is a bit an old post, but it seems that also myself need help on the same Adret Signal Generator.
I am replacing some tantalums which seem to have exploded but I need a full manual with schema all the schemas. As said by other people the downloadable version is missing some boards.
Can someone help me to identify the values of the popped tantalums in the photo, just taken from my 742 device ?
I already changed the C716 tant on the amplifier output board which was exploded and now I found also these tantalums exploded and I think this is the Attenuator board.
--- End quote ---
I've checked on my 742A and it is a 10uF, 25V tant. If you're (or anyone else :) ) is around, could I ask for confirmation on the value/voltage rating of my blown resistor? ;D
Apologies for the necroposting, but I have a 742A which I suspect might be toast as there is some appalling soldering on this UHF board. Unfortunately no pics/schematics exist of this, and even worse I suspect the Adret 1226 modules (unobtanium) might be toast. Could anyone share a picture of their UHF boards please? In particular, looking to see if the trace (green circle) has been cut, and to determine whether the capacitor (orange circle) is original or not - I think I can see the remnants of a MLCC which drains away any further hope I have of easily repairing this. :-[
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