HP 204C
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Use tags for the type of equipment your topic is about. Include the "repairs" tag, too, when appropriate. If a new tag is needed, request one in the TEAdministration forum.
Use tags for the type of equipment your topic is about. Include the "repairs" tag, too, when appropriate. If a new tag is needed, request one in the TEAdministration forum.
Re: HP 204C
Glad you managed to get into it. I couldn't be bothered to work out how to get into the 204D I had. Peeled one layer off and there was another one!
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Re: HP 204C
Once I accidentally discovered that the PSU board plugged into the main board the rest was easy. But for quite a while I was scratching my head.
An old gray beard with an attitude. I don't bite.....sometimes 
Re: HP 204C
Started re-cap of the PSU board which is attached to the rear panel.
And we have a date.
And we have a date.
An old gray beard with an attitude. I don't bite.....sometimes
Re: HP 204C
Re-cap of the main board. C11 is the huge axial 300uf/10V non-polarized capacitor on the output. I was unable to find an axial capacitor of that value and type but I did find a Panasonic radial 330uf/10V non-polarized. Look at the size difference.
The only other capacitor changed is the blue one in the front (100uf). All those other capacitors are axial leaded tants. Have you priced them lately? Now I could try to stuff radial leaded beaded tants in those confined spots but decided against it. Why? Well in order to replace them all I'd have to pull the main board. That's gonna be a freaking jigsaw puzzle. So it's not happening. Now am I taunting Murphy? Absolutely. And am I getting lazy and smart in my old age? Yes.
Left to do. Re-assemble then test/calibration.
The only other capacitor changed is the blue one in the front (100uf). All those other capacitors are axial leaded tants. Have you priced them lately? Now I could try to stuff radial leaded beaded tants in those confined spots but decided against it. Why? Well in order to replace them all I'd have to pull the main board. That's gonna be a freaking jigsaw puzzle. So it's not happening. Now am I taunting Murphy? Absolutely. And am I getting lazy and smart in my old age? Yes.
Left to do. Re-assemble then test/calibration.
An old gray beard with an attitude. I don't bite.....sometimes
Re: HP 204C
Calibration was a bit fiddly but finally fell into place. Will burn-in for at least 2 hours then this project is complete.
Displaying 1MHz Sine.
Displaying 1MHz Sine.
An old gray beard with an attitude. I don't bite.....sometimes