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Hello, Fedlog says it is a TTL 4 bit storage register. No JEDEC P/N cross reference given, but it is probably 74xx series. It is also the same as an 1820-0091 and 1820-0116. Regards, Jim ---

Hi all, I've got a dead 1820-0090 IC from an 5216A counter and am looking for a common replacement if it exists. Its function is "buffer storage" and it sits between a decade counter & a decoder

I have HP signal generator model 3320B with option 004 that works very well. However I don't know how to use the BCD programming connector at the rear. If anyone in this group has experience and/or

Hi George - Although these analyzers are vintage they still remain very popular. The parts are readily avalable and usually quite cheap. We have several variations avalable if you are interested. You

Hi - Go to Yahoo Groups and search for HP Service manuals. You will find one there. You might have to join the group, but it is painless. Regards Frank

Hello Jose, Thank you my friend for your response. I find your comments to be very helpful. People like you make the world a much better place to live. I would like to be able to ask you questions in

Hello George, Well, I have a similar disease than you (check my WEB pages for proofs ;-)! ) In last years, I have got the following HP-141T gear: *Mainframes: HP-141A (storage; old round

Hello Group: I started a collection of Tektronix gear but have developed an interest in HP's assortment of spectrum analyzers. The 141T seems to offer the biggest variety and seems to be readily

Howdy all- I'm looking for a service manual or schematic diagram for the HP 233A audio oscillator. Any help greatly appreciated. Thanks! Regards, Vollumscope

Hi All, I have a 652a (s.n. 826-01432) that has output level problems but only at a very specific range of frequencies. On the x10 range from ~40Hz to ~75Hz, the output level seems to be modulated

Hello all, I am after a working or otherwise HP4260A unit. I have one in good condition except for the large rotating resistor (R3). If you have one of these units, or know of one somewhere, I

Hi Gang, Some more info has become available. It appears that it is not called the HP8640M. The correct name is the USM-323. Anyone have one of these? 73 Ray vk2ilv Roger said: Ray said:

Hello Group, I have a pristene 54503A DSO with a problem in the Horizontal timebase. It fails with many codes mostly related to the trigger area. I could supply the codes on request. Does anyone

--- In hp_agilent_equipment@..., "Jorgen Lund-Nielsen" <dj0ud@w...> wrote: Hi Jorgen, I repaired it today. The knob was broken from the inside and pieces of plastic limited its

Hi Michal, i didn't knew the 8569, but be very careful with the knob, make sure that there is no slight defect in the switch which is probably repairable. if you use some force and some parts broke

Hi all, Is here someone kind enough to help me with my HP8569B? I got it today and I am little confused with frequency span button. Although it is marked up to 500MHz I can not set it to span greater

Hello, I am in need of the parts listing and the schematic of the Reverse Power Protection Module on the HP 8640B Sig gen. I have the Cal procedure but nothing else. Please let me know if you have a

Hi, i remember programming that chip some 20 years ago. It is fairliy simple and because the item is so small, you can do it "by hand" if you can't find another solution (wiring some switches and a

Hi All, I have a thermal printer HP 5150A that requires a new character code PROM on the BCD (Binary Coded Decimal) circuit card. (The HP part number is 1816-0561.) The PROM is type 74S188 which is

Hi, the opt.323 is not the same as the 8640M. I have both manuals, but i still don't have the manual for the Opt.323 Roger