There is also a tekscop...@yahoogroups.com which is a LOT more tolerant of random questions.
-John ================ > As below, get on the TekScopes list for more info. > teksco...@yahoogroups.com is the one to go for. > > Someone has also started a Microwave equipment group too. > http://groups.yahoo.com/group/MicroWaveandTestEquipTrader/ > > Again, you need to subscribe to even see the messages, a spam reduction > precaution, sadly. > > > Regards. > > Dave B. > An ex Tek(UK) employee, who used to work on 7Lxx's in the past. > > > ---- Original Message ---- > >>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 -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.