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

--- iandurieu <idurieu@...> wrote:

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 driver chip.

In my search I came across

which has heaps of HP semicond/IC cross reference
data but
unfortunately doesn't include the 1820-0090.

Cheers
Ian Du Rieu

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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 driver chip.

In my search I came across
which has heaps of HP semicond/IC cross reference data but
unfortunately doesn't include the 1820-0090.

Cheers
Ian Du Rieu

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
information about how to use the remote programming I would like to
take part of that.

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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 the future with your permission. How do you use your equipment from day to day? Are you interested in radio or other electronics? I will learn more by looking carefully at the web sites that you showed me. I have a fair collection of Tektronix 7000 mainframes and about half of the plugins.
2-7603
2-7704A
3-7904
1-7CT1
2-7D01
1-7L12
2-7D11
almost all 7Axx Amplifiers
almost all 7Bxx Timebases

I would like to see photos of your collection if you have them and I will let you know as my collection of 141T starts to grow. Thank you for the encouragement.

Regards
George

Sign up for Internet Service under $10 dollars a month, at

Hello George,

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 available on eBay. I'm interested in general comments about these instruments. Are they servicable, are parts generally available in generic form? Any recommendations?

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 tube)
HP-140T
HP-140T (another one)

*Plug-ins:

RF
HP-8553L
HP-8553B
HP-8554B
HP-8555A (unworking :-( )
HP-8556A
IF
HP-8552B
HP-8552B (another one)
HP-8552B (just another ;-) !)
HP-8552B (unworking)

*Accessories:
HP-8443A tracking generator (for the 8553B)
HP-8445A tracking preselector (for the 8555A; untested)

In order to complete my setup, I am missing an HP-8444A and a working HP-8555A (or repair the one I own)

I have fixed myself some items. All three mainframes had power supply problems (mostly related to drifted or opened resistors!). So first thing I recommend is to check power supply voltages. And about plugins, a couple 8552Bs had intermittent problems. I am trying to fix the 8555A but, at the moment, lack of proper test equipment.

I would say all is serviceable, as there are lots of plugins in the market (and it is lot easier for you in the USA!). And equipment is very good for amateur and semi-professional use. So, IMHO, go for it!

Regards,

JOSE

PS: I have most of the Service Manuals, if you need any.
----------------------------------------------------------------------
73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN) - Loc: IM99SM

Vintage Radio:
Vintage Test Equipment:
European Boatanchors List:

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 available on eBay. I'm interested in general comments about these instruments. Are they servicable, are parts generally available in generic form? Any recommendations?
Thanks for your comments.

George Headley
Atlanta

Sign up for Internet Service under $10 dollars a month, at

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 by another
signal. I thought it may have to do with ripple on one of the
supplies but everything looks clean. The level between 40Hz and 75Hz
will swing virtually full scale on the meter at some frequencies but
is relatively stable at 60Hz. On all of the other ranges, it's fine.

I've downloaded a manual from BAMA but it's for the newer model and
the boards are different. If someone has seen this problem and can
point me in the right direction or knows where I can get an older
service manual, I'd appreciate the help.

Thanks
PB

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 would
like to know about it.

Thanks

Rod.

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:

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

Ray said:

I need an HP8640B opt323 manual to fix my generator.
I was told the manual is called an HP8640M for military.
I've tried LOGSA and watched ebay for over a year, but nothing.

The HP8640A and B manuals are some help,
but there are some differences in the counter,
and thats where my problem is.

If you know where I can fnd one,
please let me know.
All costs reimbursed.

Regards
Ray vk2ilv

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 out in the ether have
any experience fixing these boards? I have the HP service manual but
as you probably know there are no schematics in the manual. If anyone
has them I would like to get a set. As far as getting the unit
repaired externally it most likely is not worth it since when HP last
had exchange boards they wanted way more than what the scope is worth
these days.

I would like to put it to use in my ham shack.

Thanks to all,

Sam
W3OHM

--- 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 movement.
I had a hard time with pulling it from the spindle
as someone else had already tried to repair it using glue....

Michal

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 (-maybe more than yet) than you have big problems.
i have heared about that, that hp plastic parts get very
brittle with the time, so be careful!

Jorgen


--- In hp_agilent_equipment@..., "michalvanka"



<michalvanka@y...> wrote:

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 than 10 MHz. It seems that
it is somehow mechanically blocked, there is a
small plastic rod going from analyzer's front
panel towards the span knob and ending inside it.
I did little research and figured out that this
rod is actually the thing that blocks the span button
from being turned further than to 10MHz span.

Shall I press something or do some other action to
disable that blocking?

Thanks for any advice.

Michal Vanka

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 (-maybe more than yet) than you have big problems.
i have heared about that, that hp plastic parts get very
brittle with the time, so be careful!

Jorgen


--- In hp_agilent_equipment@..., "michalvanka"



<michalvanka@y...> wrote:

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 than 10 MHz. It seems that
it is somehow mechanically blocked, there is a
small plastic rod going from analyzer's front
panel towards the span knob and ending inside it.
I did little research and figured out that this
rod is actually the thing that blocks the span button
from being turned further than to 10MHz span.

Shall I press something or do some other action to
disable that blocking?

Thanks for any advice.

Michal Vanka

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 copy of these and I would be glad to
pay for any incurred exepnses.

Thanks, Peter K2LRC

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 timer for the programming voltage).

In my TTL data book of 1979 they show the pinout and write: See Bipolar Microcomputer Components Data Book LCC4270.

That one should be available somewhere in a university library or so. I also have a sheet of notes on programming the S188 somewhere, where...

Regards
Dieter Teuchert


KJ Chadwick wrote:

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 a 256 bit memory organised as 32*8 bits.
I can purchase the IC and I can work out the required bit map but I have no way of programming the PROM.

...
--
Dipl.-Phys. Dieter Teuchert
Software und Systeme
Postanschrift:



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