Find and contact HP Customer Support, download drivers, manuals and troubleshooting information for HP products, including pcs, laptops, desktops, printers, tablets, apps and services. HP 3582A Spectrum Analyzer quick reference guide The HP 3582A spectrum analyzer is an older technology instrument, but is one of the easier to use since all of its controls are on separate knobs instead of menu driven selections. If manual triggering is desired, the LEVEL knob should be rotated until the signal is triggered.

HI everyone this is my first post! I have recently been given a free (but faulty) Hp 3582a spectrum analyser. It has scrambled text on the screen and a locked up front panel.

Switching on the test button on the graphics card produces the AAAAA's on all four lines but no Square wave is shown. After taking out all the cards except the rom and processor I have checked every voltage that can be measured with the service manual and every thing seems ok. No ripple on any of the dc lines. The clocks are present in the tp1 and tp2 test points. The Single/both channel led does not change when switched.

I have also checked with the scope the reset circuit for the initial turn on and this all looks ok. So now I am pretty sure my fault is with either the processor or the rom board. To progress with this repair I guess I will need to buy a 5004a signature analyser. So my question is can other analysers be used such as 5005a or 5006a?

As these seem easier for me to get hold of. Also if any one who has experience in repairing these might have some ninja checks I could make any help would be appreciated. Yes i have the feeling its the rom chips as well. I might have got lucky as I found a cheap rom board on ebay. I know its a long shot but if it does not work out it will still be useful for spares. The seller says it came from a working machine and its the same version as mine.

I am in the uk and can only find a 5004a for £120 ($188) LOL so i might have to contact you later free_electron if this rom board is hawked as well. Although i can not see many more HP kit coming my way. Burning fresh eproms sounds like a great idea although as of yet I can not find any rom images I will keep looking. I will report back and let you all know if the cheapest option works out. So by pure luck I managed to get hold of a CPU and ROM board but to no avail.

The seller they had came from a working machine and with them in I have exactly the same results. So they are put to one side. I have checked all caps now for capacitance and ESR (out of circuit) and I have to say they are all really good. I have also re-soldered everything including the board connectors in the nests as the machine had been in a pretty grim store cupboard for about 15 years. For my tests I only have 1 input installed, the ROM, CPU, RAM, Display processor/driver and the Analog display driver. I am not used to probing digital systems so maybe someone with knowledge might be able to steer me in the right direction. For those playing along I have taken a few pictures of the ROM, RAM and CPU edge connectors.

The I/O bus all sits at 5V as do the outputs from the decoders. I presume thats because the CPU is stalled. I also do not have pcb extenders which is a real bind. SO before I buy a signature analyser is there anything else I might have overlooked? Well I have some interesting news.

I checked the processor and ROM boards which all seemed ok. However there were a couple of readings in the ROM which were a digit out, could this be a typo? The main problem I have found so far though was on RAM ic U10. Hp Deskjet 6840 Driver Windows 7 32bit. Php Mysql Update Where Clause In R on this page. This had an unstable reading on the WRITE pin of the Data Line. I unsoldered this chip and the one next to it, added sockets and retested with the same results. When I then swapped round the 2 RAM chips the fault followed the IC.

So this IC is definitely faulty. It is labeled /927 1818-0508.

Does this seem a likely candidate for my symptoms? And are these unobtainium? First the good news. The RAM chip was indeed faulty.

With the new chip in I had a working processor, a flashing data loading light, the front panel was unlocked and the 4 text lines were restored to the correct info for normal use. The graphic display however was not showing any sign of life. I took the opportunity to run some of the self checks (ROM and RAM) which all passed ok. The bad news is whilst going through the first signature analysis check on the ASM circuits I lost all image to the screen.

The Data Loading light is still running so the processor is happy and currently I have a feeling it was a D-type flip flop which failed which does the character ROM latch. I also have a suspicion that the graphic problem is due to another D-type flip flop with the same part code. I am guessing these are early CMOS. Does anyone have any 1980's CMOS tales?

Ok, so I replaced the flip flops and I then had good looking signals all the way down to the video multiplexor switches. There were no outputs on these switches. They feed directly to the x, y and z high voltage amplifiers. These were the LF13201n, a bit difficult to find.