I bought one after watching this! But how in the world do you take the top/bottom cover off? I see 1 screw on the rear for the top, but it won't just 'slide off'.
Excellent troubleshooting, Scott! I had a similar issue with a programmable attenuator in a signal generator, contacts not quite closing - high frequency looked pretty good but low frequency levels were off - the AGC circuit added to the confusion. I just replaced the incandescent lamps in an HP 4282A High Capacitance Meter with LEDs - just replace the series dropping resistors to get the current you need.
I've found bad voltage selector switches in a 437B Power Meter recently, all reading high resistance. A good number of HP gear of this vintage use the batteries for saving front panel settings. If you are lucky they won't have leaked.... yet... :D
Batteries replaced, no leakage was present, there wasn’t much in that area anyway, AND they placed them at the bottom edge of the board... someone was thinking when they designed it!
@@TheDefpom Nice work. My 8160A Pulse Gen has the batteries at the bottom of the PCB too but they leaked. At least the damage was confined to a couple traces instead of half the PCB... My 4276A LCZ meter needed new card edge sockets but was ultimately fixable at least.
Hmm a variable resistance relay lol Ahh the Rifa craps, a sleeper just waiting to fail, little buggers :-D I had some of those caps, the dustbin was happy :) I still think bead tantalums exploding was slightly better, like a fire cracker :-D
And the Magic Smoke award-this month,go's too DefPom👍
I’m winning this month! Yay!
Yep that was always going to go up in smoke but nice to get it on camera LOL. Nice signal generator.
I bought one after watching this! But how in the world do you take the top/bottom cover off? I see 1 screw on the rear for the top, but it won't just 'slide off'.
Excellent troubleshooting, Scott! I had a similar issue with a programmable attenuator in a signal generator, contacts not quite closing - high frequency looked pretty good but low frequency levels were off - the AGC circuit added to the confusion. I just replaced the incandescent lamps in an HP 4282A High Capacitance Meter with LEDs - just replace the series dropping resistors to get the current you need.
Yay, you smoked a rifa!
It was great to catch it on camera. Even though it wasn’t on the main one ☹️
......and we were joking on the live stream that the fire brigade was required!
Noticed on the HOPI: 0.6A before the smoke and 1.2A during....nice!
Yeah I saw that on the HOPI too, pretty cool to see that! That is why I put the HOPI there so it can be seen on camera as much as possible.
Nice a video on April fools day can't wait till part 2 :-)
Once the parts arrive I can finish it.
Nice intro.... 😵👍
Thanks
I've found bad voltage selector switches in a 437B Power Meter recently, all reading high resistance.
A good number of HP gear of this vintage use the batteries for saving front panel settings. If you are lucky they won't have leaked.... yet... :D
Batteries replaced, no leakage was present, there wasn’t much in that area anyway, AND they placed them at the bottom edge of the board... someone was thinking when they designed it!
@@TheDefpom Nice work. My 8160A Pulse Gen has the batteries at the bottom of the PCB too but they leaked. At least the damage was confined to a couple traces instead of half the PCB... My 4276A LCZ meter needed new card edge sockets but was ultimately fixable at least.
well it its 40 years old, if it wants to smoke it can! (just not near me!)
Yeah passive smoking around this thing will definitely be bad for you.
Beware, the Rifa capacitors.
I was wondering at the start of the stream if you was going to replace the rifa caps before powering on.
Where’s the fun in that
Awesome
Hmm a variable resistance relay lol
Ahh the Rifa craps, a sleeper just waiting to fail, little buggers :-D
I had some of those caps, the dustbin was happy :)
I still think bead tantalums exploding was slightly better, like a fire cracker :-D
RIFA caps are always entertaining... I was just surprised it took it so long to blow up.