>Hello all, >I have an old 7L18 spectrum analyzer that used to serve me well on the >higher bands. >Unfortunately, the controls have got into complete disorder. >It seems like one or both of the ROM's are dead.
>Anyone have / knows where to find ROM images of the 7L18? Adrian Can I suggest you post this to the tekscopes group - they have answers to pretty well everything Tek Having said that I do not know of any ROM images out there - I have 2 7L18s but have never got around to making ROM backups - never been able to find the ROMs to burn. Assuming it is the digital section at fault (eg no panel controllable frequency on the readout display)Several pointers; 1) If not used for a long time, the connectors, both internal and to the mainframe can go very dirty. The PI uses lots of power & needs every connector to be doing its job. Some users say remove & slam in the PI several times to help wake it up (very brave/stupid ones do it with power on) 2) digital parts can be affected by gone bad electrolytics pulling down the supplies or eg: affecting the processor reset circuit. 3) in my case the processor board had a defective RAM - no response to controls because no boot, although it would get to different stages of the boot process before halting. (Got a replacement chip from that auction house) 4) because the various sub sections/boards are so interconnected the best way to trouble shoot is to have a 2nd 7L18 (or at least a second processor board)available for board substitution. 5) you can make extenders which allow board level trouble shooting - the digital bit runs quite slowly and a logic analyzer will help if the problem lies further down the line. 6) finally, if you can back up the ROMs, I would like to place an order for a set! Chris HJ _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
