Thanks for the HP Bulletin. Long time since I''ve seen one of those (Used to work for HP in the 1970's to 1980's). I have already fixed the 5V Power supply and that was a shorted 390uf 20V Electrolytic cap. But the digital display does not display either level or frequency, although the audio level out is just fine. Did the loop tests in the part of the manual I have and still nothing obvious, so really need a schematic to understand what's is going on.
Peter On Sat, Aug 7, 2010 at 8:02 PM, Fuggitaboutit <[email protected]> wrote: > > > http://www.hparchive.com/Bench_Briefs/HP-Bench-Briefs-1980-07-08.pdf > bulletin from hp says the product may have had incorrect line fuse > if you want to fix it take the cover off and check some basics > many of the hp test equipment of this vintage needed power supply caps > > --- In [email protected]<Repeater-Builder%40yahoogroups.com>, > petedcur...@... wrote: > > > > Hi, > > > > I saw someone had used a HP3551A TIMS to set up repeater audio levels. I > > have a used HP3551A also, but it recently stopped working. Wonder if > anyone > > had schematics? The manual I found online had everything but no > schematics. > > A good high resolution Jpeg photo of the schematics would be greatly > > appreciated. > > > > Peter > > > > Ex. G8DCB. Now resident in FL.USA. > > > > >
