i would advise checking that pcb for conductivity now it carboned up like that if that opamp is jfet or running lots of gain or a low offset type a few 100k of carboned pcb is gonna mess up its output, could always make a little sub board and isolate all that burnt board, oops edit i looked up tl171 low offset opamp not tl191 bimos switch
That chip is not an op-amp, it is an analog switch. You can stack them and reduce the switch resistance by half. (But why not just choose a better part?) With the charred spot, and especially the burned resistor between chassis and mains ground, I bet somebody accidentally connected signal ground to a not-ground output. Maybe a bridge-tied amplifier? This is the same failure as when a beginner doesn't understand oscilloscope ground.
Nice one! Hope Mr. Matsushita isnt too fussed about you showing the insides... well, he's got nothing to be ashamed of! Have you considered QA403? I love it for the simplicity and ease of presenting/storing the data, albeit I'm only a weekend dabbler.
nice bit of kit ,i recently bought a hp8657a sig gen which is rare as rocking horse s..t in the uk ! it has front panel lockup (with no battery leak) but it happens so rarelly its being a pain to fault find
Guess work on how it operates, guess work on the repair, total waste of time replacing capacitors, and the machine is just as likely to stop working again as nothing has been repaired.
![เปิดคำทำนาย นอสตราดามุส - บาบา วานก้า ปี 2025 คนทั่วโลกต้องเจออะไรบ้าง? | แฉ 11 ธ.ค. 67 [2/3] |GMM25](http://i.ytimg.com/vi/xmTIKWJUMPM/mqdefault.jpg)
Excellent! Just Excellent!
i would advise checking that pcb for conductivity now it carboned up like that
if that opamp is jfet or running lots of gain or a low offset type a few 100k of carboned pcb is gonna mess up its output, could always make a little sub board and isolate all that burnt board,
oops edit i looked up tl171 low offset opamp not tl191 bimos switch
That chip is not an op-amp, it is an analog switch. You can stack them and reduce the switch resistance by half. (But why not just choose a better part?)
With the charred spot, and especially the burned resistor between chassis and mains ground, I bet somebody accidentally connected signal ground to a not-ground output. Maybe a bridge-tied amplifier? This is the same failure as when a beginner doesn't understand oscilloscope ground.
Great work, Trevor👍
Nice one Trevor going to very useful works in a very nice way.
When the daddy chip and the mommy chip love each other very much...
I think you got a real deal here. I was worried at first you were going to have a bad microcontroller.
Nice one! Hope Mr. Matsushita isnt too fussed about you showing the insides... well, he's got nothing to be ashamed of! Have you considered QA403? I love it for the simplicity and ease of presenting/storing the data, albeit I'm only a weekend dabbler.
That's some weird history.
nice bit of kit ,i recently bought a hp8657a sig gen which is rare as rocking horse s..t in the uk ! it has front panel lockup (with no battery leak) but it happens so rarelly its being a pain to fault find
Cadmium, not cadium
Guess work on how it operates, guess work on the repair, total waste of time replacing capacitors, and the machine is just as likely to stop working again as nothing has been repaired.
YET ANOTHER,cHANGE ALL THE CAPACITOR VIDEO BORING
Some of us still enjoy it. I say keep it up.