Batboard

Hi All,

My 120A PSU died when one of the LT1070CT regulators blew apart.

Does anyone have a link to the service manual as I need to reroute some damaged trace and find out what the diode type was in front of the regulator IC.

Even a scanned page of the relevant section would help!!

Kind regards
Maarten
VK6MP

The COM-120 manuals I have seen provide no details or schematics at the board level for the power supply. The power supply adjustments are not even documented in the manual.

IFR stopped providing full schematics with the 1500/1200/500 generation and while the Com-120 manual has some schematics there are a lot of missing board level schematics so it's far from complete. The later the model the less detailed information is provided.

Some of this may be due to the modules being OEM''d and the details are not available even to IFR.

Best bet is to reverse engineer based on the LT1070CT application notes and data sheet and verify that this is for one of the 5 volt outputs. Usually the design follows the IC documentation very closely in order to keep in a supported context from the chip manufacturer ( also quicker to design )

That's good advice. I thought I'd be able to just pull my copy of the service manual and get the information - and I was surprised that I didn't have schematics. Unfortunately, all that existed were the engineering drawings, and those have long ago been moved to the salt mines (literally: we have storage at Underground Vaults and Storage in Hutchinson), so I cannot just walk over and pull them out - so I'm not much better off than you guys.

If your COM-120A has a power supply made by CEI in Florida then I have no data on that. When CEI could not meet the production schedule and IFR pulled the production back to Wichita, I have some parts for those supplies.
Carl NØPXJ