mdog69
Experienced Member
I have a Sun IPX which I've had in storage for the thick end of 5 years, that I'm trying to bring back to life, which is falling to power up.
Connecting power and turning on the mains power gives nothing - no twitch of the fan motor, no high pitched squeals or ticking.
Powering up with the hard drive power disconnected or the main board disconnected yields the same result.
There are no signs of bulging capacitors or any signs of leakage along the lines of
http://www.vcfed.org/forum/showthread.php?58857-Recapping-Sun-SPARCstation-IPC-Power-Supplies or http://www.vcfed.org/forum/showthread.php?64027-SPARCstation-IPC-Capacitor-Carnage
(no stains or corrosion)
There are no signs of any parts having released any magic smoke, or having got too hot.
For the record, the power supply seems to be identical to the IPC power supply mentioned in the above links.
Other PSU identifying information:
Sun part number 300-1055-07
Sun (and Sony) part name "APS-02"
Manufactured by Sony
Part number: 1-634-165-13
Rating: 5V 9A, 12V 1.5A, -12V 0.1A
Before I try to reverse engineer a schematic over the weekend, does anyone have any suggestions or hints?
Thanks in advance
mdog69
PS: The "dead" NVRAM issue has been handled - the original battery was dremmeled/hacked out and replaced by a coin cell some years ago, and, as of a couple of days ago, we are now on coin cell number 2.
Connecting power and turning on the mains power gives nothing - no twitch of the fan motor, no high pitched squeals or ticking.
Powering up with the hard drive power disconnected or the main board disconnected yields the same result.
There are no signs of bulging capacitors or any signs of leakage along the lines of
http://www.vcfed.org/forum/showthread.php?58857-Recapping-Sun-SPARCstation-IPC-Power-Supplies or http://www.vcfed.org/forum/showthread.php?64027-SPARCstation-IPC-Capacitor-Carnage
(no stains or corrosion)
There are no signs of any parts having released any magic smoke, or having got too hot.
For the record, the power supply seems to be identical to the IPC power supply mentioned in the above links.
Other PSU identifying information:
Sun part number 300-1055-07
Sun (and Sony) part name "APS-02"
Manufactured by Sony
Part number: 1-634-165-13
Rating: 5V 9A, 12V 1.5A, -12V 0.1A
Before I try to reverse engineer a schematic over the weekend, does anyone have any suggestions or hints?
Thanks in advance
mdog69
PS: The "dead" NVRAM issue has been handled - the original battery was dremmeled/hacked out and replaced by a coin cell some years ago, and, as of a couple of days ago, we are now on coin cell number 2.