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trabant (23000300) out of order

 

Hi folks,

my SPARCstation IPX decided to give up the ghost today.? I'll see if I can fix it, but for now, I only have the VAX (23000200) and the cisco (23000100) online.

Cheers,
Hans
 

Checking the PSU, I found that the +12V rail is dead,?+5V and -12V are fine and judging from the SCSI2SD activity, it seems that the machine boots as well.? I guess I'll bodge a boost converter into the +5V rail to generate the?+12V needed to drive the AUI transceiver and the serial ports.? These SPARCstation IPC/IPX power supplies are really sad :(

Am Mo., 12. Juni 2023 um 17:41?Uhr schrieb Hans Hübner <hans.huebner@...>:

Hi folks,

my SPARCstation IPX decided to give up the ghost today.? I'll see if I can fix it, but for now, I only have the VAX (23000200) and the cisco (23000100) online.

Cheers,
Hans
 

Am Mo., 12. Juni 2023 um 18:07?Uhr schrieb Hans Hübner <hans.huebner@...>:
Checking the PSU, I found that the +12V rail is dead,?+5V and -12V are fine and judging from the SCSI2SD activity, it seems that the machine boots as well.? I guess I'll bodge a boost converter into the +5V rail to generate the?+12V needed to drive the AUI transceiver and the serial ports.? These SPARCstation IPC/IPX power supplies are really sad :(

Time will tell whether the repair was permanent, but for now, the IPX is running again.? I cut the?+12V outputs from the PSU and instead inserted a simple MT3608 based boost converter board as planned.? Simple enough, and it just works for now.?

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