Sun SPARCstation IPC/IPX replacement power supply
I've got tired of unsuccessfully trying to repair the APS-02 power supply that is built into Sun's SPARCstation IPC and IPX workstations, so I designed this replacement. It uses two encapsulated power supplies and a MAX8215 power supply monitoring chip to generate the SENS signal.
Here's a picture of my version 1 build. It has the base load resistors bodged on. The layout has been revised since:
Several parts out of the original PSU board are reused and need to be desoldered:
| Ref | Qnty | Value | Notes |
|---|---|---|---|
| F1 | 1 | 3.15A T | Fuse + fuse holder |
| J1 | 1 | L | Power input (3 pin, middle pin not connected) |
| J2 | 1 | AC IN | Power from IEC input (1 pin) |
| J5 | 1 | AC OUT | Power to IEC output (1 pin) |
| J12 | 1 | Fan | Power to fan (2 pin) |
| K1 | 1 | DH2U TV3 | IEC output relay |
| 1 | Cable harness including floppy connector |
Another couple of parts need to be bought
| Ref | Qnty | Value | Description |
|---|---|---|---|
| U1 | 1 | 74HCT11D | Triple 3-input NOR, SO-14 |
| U2 | 1 | MAX8215CSD | Voltage Monitor IC, SO-14 |
| D1 | 1 | PMEG2010ER | 50V 1A General Purpose Rectifier Diode, SOD-123 |
| C1, C2 | 2 | 100nF | Capacitor bipolar SMD 0603 |
| C3 | 1 | 1µF | Capacitor bipolar SMD 0603 |
| R1, R2, R3, R4 | 4 | 680kΩ | Resistor SMD 0603 |
| R5, R6 | 2 | 120Ω | Resistor radial 5W, 20mmx9mmx9mm, 25mm pitch |
| PS1 | 1 | IRM-60-5 | MeanWell IRM-60-5 50 Watt AC/DC power supply, 5V, 10A |
| PS2 | 1 | RACM30-12DK | RECOM RACM30-12DK/277 30 Watt Dual Output AC/DC power supply, ±12V, ±1250mA |