[time-nuts] OT - Tek 7L18 ROM

J. Forster jfor at quik.com
Mon Nov 9 15:35:30 UTC 2009


There is also a Tekscopes2 at Yahoogroups.com which is a LOT more tolerant of
random questions.

-John

================


> As below, get on the TekScopes list for more info.
> TekScopes at 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
>
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