HP 3325A SERVICE MANUAL PDF

The manual is available from Didier's great collection. The frequency can be specified with up to eleven digits of precision! This is one of the first instruments to use a "fractional—N" PLL synthesizer. The output frequency is derived from a reference frequency which can also be supplied externally. One of the first things to notice about the is the relatively low weight, which comes as a bit of a surprise given the voluminous case and experiences with other HP instruments of similar size.

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The manual is available from Didier's great collection. The frequency can be specified with up to eleven digits of precision! This is one of the first instruments to use a "fractional—N" PLL synthesizer. The output frequency is derived from a reference frequency which can also be supplied externally. One of the first things to notice about the is the relatively low weight, which comes as a bit of a surprise given the voluminous case and experiences with other HP instruments of similar size.

Internal construction is simple and clear. A central chassis carries circuit boards above and below, and there are no voluminous or heavy parts other than the mains transformer.

HP offered two major options on this unit: Opt. The mains transformer is permanently connected to the line so that the OCXO can be kept powered on at all times, and the nominal output frequency is available without waiting for warm-up. As a consequence, even the pictured unit without Opt. Instead, HP used a proprietary microcontroller only known as "", designed and produced by HP itself.

This chip can also be found in a number of HP computer peripherals of the 98x5 desktop computer era, such as diskette drives or printers.

The required bias voltage was apparently somewhat variable between production runs, so the correct value was stamped or even hand-written onto every chip. In case the processor needs to be replaced, the technician may have to modify a voltage divider on the main board!

Until recently, little information on the processor was available online. Meantime, a Nanoprocessor User's Guide has turned up. In the , the Nanoprocessor was combined with two "huge" RAMs x4 bit! ROMs holding the firmware. Apparently, the developers then still had sufficient time for debugging The unit pictured here, manufactured in early judging by the date codes on the various chips, worked almost out of the box.

The usual problems with sticky keys were easily solved no pun intended using alcoholic cleaner and a little exercise. Initially, the unit tended to lock up soon after power on if more CPU intensive tasks were executed e.

This problem disappeared after warm-up. There is a relatively high drop across a choke on the CPU board that I will likely replace in the long run. A tiny increase of the supply voltage fixed the issue. After several hours of patient operation, the died unexpectedly, with a faint odour of hot plastic. Oh no, not the CPU please, it's practically unobtainable Disconnecting the internal boards one by one quickly identified the output board as the location. Maybe the output stage? Oh well, get the magnifier in.

Sure enough, there's a dead opamp U Cross-reference parts lists identify it as an LM x1 buffer. No need to despair: The pinout is the same as a , which specification-wise will do fine here.

With a I even had a spare one with '82 date codes, hee hee and new solder links, the is happy again. Dead buffer amp U Another thing that irks me about the is that the poor little reference crystal is located right in the main airflow path from the rear fan. If you wanted real stability you'd have to order Opt. A small styrofoam baffle should at least improve short term stability a little. It did make frequency trimming a bit easier, although putting the bottom cover back on still offsets the frequency quite a bit.

Especially since that choke was installed, my has had cold start problems literally related to temperature. Some experimentation shows that apparently the processor won't reset cleanly. This one has "5. Well then, how does this thing reset in the first place? According to the schematic from the manual and the pinout diagram , there is no reset pin?! Apparently, replacing that choke upset the power supply sequencing. Toggle navigation holzleitner. Hewlett Packard A Synthesizer. Hewlett Packard A interior bottom view.

The unit pictured here has Option installed small PCB at bottom right. Repairs The unit pictured here, manufactured in early judging by the date codes on the various chips, worked almost out of the box. Resuscitation 1 After several hours of patient operation, the died unexpectedly, with a faint odour of hot plastic. Resuscitation 2 Especially since that choke was installed, my has had cold start problems literally related to temperature.

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Manuel D'usine Hp 3325A Download Pdf

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