This
brings up an interesting memory, I worked at a nationwide paging company and was
moved back into repair manager after the new manager guy was fired. (He
got caught listening in on a private conversation with a Telco
buttset between a tech and the President of the company) I started
the shop and then they hired a new guy to release me for more important
assignment. After a couple months the reliability of the repaired pagers
went from 2 to 3 % to a whopping 97% dead when they were
returned to the field! The guy was a real winner!
After
I got settled back in my old office about 35 miles closer to my house I started
talking to the techs and following what this new guy had them doing. Under
his instruction they were to monitor the analog audio out of the pager with an
oscilloscope and "tune" the 1st oscillator until the scope triggered! I
asked how and where do they know where to set the trigger to get the frequency
correct? They all said they did not know, it's just way the shop manager
said it had to be done! I found the pagers were way off
frequency. What I did is come up with a RF sniffer and the
calculations of each model of pager's injection frequency so they could read the
injection frequency out on the service monitor. I personally don't like
the injection method of setting the frequency but it was the most simple way for
the techs we had at the time.
This
one change took the failure rate from 97% to 2 to 3% in two weeks, a complete
reversal! My job was done.
Paul
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