[Milsurplus] Harris RF-5720 HF Modem

[Peter Gottlieb]

Are tantalum capacitors used in the modem?  There might be a shorted power 
supply rail due to one.  That can usually be isolated.

Is the fuse on the input or output of a supply?  Can you isolate the supply from 
the unit?  For example, is the unit made of many plug-in boards which could be 
removed?

For a fault like this there's a lot you can do without a manual.

Peter



On 12/28/2014 5:24 PM, Joseph Pinner wrote:
> Well, my previous trouble with the modem was small compared to this.
>
> Yesterday, I turned it on and display was blank.
>
> Opened it up and pulled the Power Supply board and after visual and some other 
> troubleshooting, found that the pico fuse was open.
>
> Today I replaced the fuse and it blew again. Without more information, I 
> cannot tell if is is a power supply issue or a short in the other modules.
>
> Does anyone have schematics/maintenance information for the RF-5720?
>