#43 - HP 8590A spectrum analyzer repair - part 1 of 3

A good old HP 8590A spectrum analyzer, which was picked up from eBay for parts or repair. It turned out to have a bad mixer in the first converter. A matched pair of schottky diodes was dead. A replacement was found and installed. The analyzer seems to be back in business. Perhaps, it will need some adjustments though.

Forum:
http://www.eevblog.com/forum/repair/h...

Service manual:
http://www.keysight.com/upload/cmc_up...

Avago (Broadcom)HSMS-28xx datasheet:
http://www.mouser.com/ds/2/678/AV02-0...[1]-908864.pdf

Diodes on Mouser:
HSMS-2802 - the ones I used:
http://www.mouser.com/ProductDetail/B...
HSMS-2812 - the ones I think I should have used:
http://www.mouser.com/ProductDetail/B...