Technical Desktops


9000/720

700 Series Selection:

Name: 720/730
Product Number: A1929A
Introduced: 1991
Division: Workstation Systems
Original Price: $14890
Catalog Reference: Does not appear

Description:

The 720 and the 730 (including model numbers A1929A, A1933A) were the first of the new "Snake" workstations based on HP's PA-7000 RISC CPU. The 720 ran at 50 MHz and the 730 ran at 66 MHz. These computers could accommodate up to 64 MB of RAM. Each computer came with a DIO-II and EISA expansion slot.

Collectors notes: We have seen 100% of the 9000/700 series units we have in the collection need a new AC receptacle/filter when they are powered up after a long time of not being used. The metalized capacitors inside these filters break down and produce a combination of magic smoke and a sticky fluid - usually within 30 mins of AC being connected - and will often trip an earth leakage circuit breaker in your AC supply due to the filter breakdown (note that the fuse in the unit does NOT protect against this failure).

Once the receptacle is replaced (SCHAFFNER FN9222R-10-06 IEC Filter), it's common that the electrolytic capacitors in the power supply used in the 720/730 (an Astec BM200-3601) will all need to be replaced due to leakage or a high ESR. This includes the 8 2200uf 25V capacitors in the 5V and 12V lines as well as the smaller ones that have been seen to stop a supply from powering up.

Also be prepared for any of the tantalum 33uf 16V capacitors on the PC boards to burn out as well - easily replaced and if caught before they burn too much, will not do any damage to the unit. This has only been seen once in one unit so hopefully is unlikely to happen in general.

 

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