Wavetek 23 croaks, anyone know of "notorious" falure areas?
in [Design]
|
From: Joerg on 4 May 2010 17:22 So here I am, doing variable line frequency test and ... phssss ... PHUT .... *BAM* ... followed by a stench wafting about. I looked at what was supposed to be 265V/50Hz sine and found a totally distorted 1Hz, plus lots of heat in my amp which luckily survived. Turns out the Wavetek 23 function generator became totally "loose" in frequency. Have to wrap up some stuff today so I tried and was able to goose it to 50Hz by cranking it to 995Hz (above 1kHz it completely loses it). But that's a white-knuckle ride because the test runs mostly unattended. Does anyone know whether these things have a typical pathology that can be fixed? Like this or that cable always comes loose, etc.? I have re-seated the EPROM, battery is fine, re-seated connectors, nada. I do have the manual but diagnosing it from synthesizer to the end will take hours because it's a uC driven instrument. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: tm on 4 May 2010 17:37 "Joerg" <invalid(a)invalid.invalid> wrote in message news:84bhhlFqkkU1(a)mid.individual.net... > So here I am, doing variable line frequency test and ... phssss ... PHUT > ... *BAM* ... followed by a stench wafting about. I looked at what was > supposed to be 265V/50Hz sine and found a totally distorted 1Hz, plus lots > of heat in my amp which luckily survived. > > Turns out the Wavetek 23 function generator became totally "loose" in > frequency. Have to wrap up some stuff today so I tried and was able to > goose it to 50Hz by cranking it to 995Hz (above 1kHz it completely loses > it). But that's a white-knuckle ride because the test runs mostly > unattended. > > Does anyone know whether these things have a typical pathology that can be > fixed? Like this or that cable always comes loose, etc.? I have re-seated > the EPROM, battery is fine, re-seated connectors, nada. I do have the > manual but diagnosing it from synthesizer to the end will take hours > because it's a uC driven instrument. What smoked, the Wavetek or the Amp? Sounds like a cap let loose. You need to put the smoke back in. T
From: Joerg on 4 May 2010 17:56 tm wrote: > "Joerg" <invalid(a)invalid.invalid> wrote in message > news:84bhhlFqkkU1(a)mid.individual.net... >> So here I am, doing variable line frequency test and ... phssss ... PHUT >> ... *BAM* ... followed by a stench wafting about. I looked at what was >> supposed to be 265V/50Hz sine and found a totally distorted 1Hz, plus lots >> of heat in my amp which luckily survived. >> >> Turns out the Wavetek 23 function generator became totally "loose" in >> frequency. Have to wrap up some stuff today so I tried and was able to >> goose it to 50Hz by cranking it to 995Hz (above 1kHz it completely loses >> it). But that's a white-knuckle ride because the test runs mostly >> unattended. >> >> Does anyone know whether these things have a typical pathology that can be >> fixed? Like this or that cable always comes loose, etc.? I have re-seated >> the EPROM, battery is fine, re-seated connectors, nada. I do have the >> manual but diagnosing it from synthesizer to the end will take hours >> because it's a uC driven instrument. > > > What smoked, the Wavetek or the Amp? Sounds like a cap let loose. > No, the DUT. It didn't appreciate several amps of near-DC current. So it'll be a weekend project then, check the power supply caps, trace stuff from synth to final amp and so on. <sigh> Unfortunately there's already a nasty one on the list for Saturday, a stringer on some outside stairs has rotted out. <double_sigh> > You need to put the smoke back in. > Dang, I opened the window and it's gone :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: John Larkin on 4 May 2010 18:00 On Tue, 04 May 2010 14:22:54 -0700, Joerg <invalid(a)invalid.invalid> wrote: >So here I am, doing variable line frequency test and ... phssss ... PHUT >... *BAM* ... followed by a stench wafting about. I looked at what was >supposed to be 265V/50Hz sine and found a totally distorted 1Hz, plus >lots of heat in my amp which luckily survived. > >Turns out the Wavetek 23 function generator became totally "loose" in >frequency. Have to wrap up some stuff today so I tried and was able to >goose it to 50Hz by cranking it to 995Hz (above 1kHz it completely loses >it). But that's a white-knuckle ride because the test runs mostly >unattended. > >Does anyone know whether these things have a typical pathology that can >be fixed? Like this or that cable always comes loose, etc.? I have >re-seated the EPROM, battery is fine, re-seated connectors, nada. I do >have the manual but diagnosing it from synthesizer to the end will take >hours because it's a uC driven instrument. The old Waveteks are getting, well, old. I just got a couple of B&K 4003As. Nice box. John
From: Joerg on 4 May 2010 18:12
John Larkin wrote: > On Tue, 04 May 2010 14:22:54 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> So here I am, doing variable line frequency test and ... phssss ... PHUT >> ... *BAM* ... followed by a stench wafting about. I looked at what was >> supposed to be 265V/50Hz sine and found a totally distorted 1Hz, plus >> lots of heat in my amp which luckily survived. >> >> Turns out the Wavetek 23 function generator became totally "loose" in >> frequency. Have to wrap up some stuff today so I tried and was able to >> goose it to 50Hz by cranking it to 995Hz (above 1kHz it completely loses >> it). But that's a white-knuckle ride because the test runs mostly >> unattended. >> >> Does anyone know whether these things have a typical pathology that can >> be fixed? Like this or that cable always comes loose, etc.? I have >> re-seated the EPROM, battery is fine, re-seated connectors, nada. I do >> have the manual but diagnosing it from synthesizer to the end will take >> hours because it's a uC driven instrument. > > The old Waveteks are getting, well, old. > You should see the old Boonton Megacycle Meter here. It's this one: http://oak.cats.ohiou.edu/~postr/bapix/Dip_59.htm > I just got a couple of B&K 4003As. Nice box. > Yes, although I hate to throw out stuff that could (reasonably) be repaired and I need a function generator only once in a blue moon. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |