Tottori Sanyo SPS-356JU (Sega Tera Drive Power Supply)
- For more information, see this article's corresponding Wikipedia page: TeraDrive.
| Preliminary Information | |
|---|---|
| Release Year | 1991 |
| Leak Risk | High |
| Batteries | None |
| Capacitor Types | Through Hole |
| Destructive Entry | No |
This power supply is used on the Sega Tera Drive. It accepts Japanese and North American AC power (100-120 Vac) at 50 or 60 Hz. It outputs 5 Vdc at 5A and 12 Vdc at 1A via an AT-style connector. Note that the power supply is not AT-compatible. As the Tera Drive is based upon an IBM PS/55 model, it has the same IBM-style internal latching power switch, which is operated via a linkage.
Known Issues
Won't Power System First Try
Causes
- Leaky capacitors prevent the power supply from delivering its rated voltage for as long as a minute
- Adjustment potentiometer oxidized, defective, or incorrectly set
Solutions
- Replace power supply capacitors
- Using suitable test equipment and not the computer this power supply is for, adjust the adjustment potentiometer until the output voltages are correct
- Use DeOxit or equivalent on the adjustment potentiometer and adjust as above
- Replace adjustment potentiometer
Smells Like A Fishing Vessel
Causes
- The capacitors have degraded over time and leaked their electrolyte
- System operated in extreme conditions
Solutions
- Replace capacitors
- Clean up the board to remove all corrosive electrolyte
- Cease operating the computer on a fishing vessel
Disassembly Notes
-
The top of the power supply
-
The cable side of the power supply
-
The rear-facing side of the power supply
There are three kinds of screws:
- The two screws with lock washers used to attach the latching power switch to the power supply's case
- The two longer screws used to attach the PCB to the power supply's case and the two longer screws used to attach the power supply to the Tera Drive's chassis
- The six short screws used to attach the power supply's top and bottom halves to one another
The strain relief on the internal power supply connector has become hard with age, and probably cannot be removed by squeezing the tabs and squishing it as designed. You may need to slightly bend apart the sheet metal that makes up the channel the strain relief slots into to allow you to remove the strain relief with the amount of deformation you're able to do to the plastic.
Original Parts
Power Supply PCB
-
Top side of PCB
-
Bottom side of PCB
| RefDes | Qty | Capacitance | Voltage | Mount | Diameter/Size | Height | Lead Spacing | Temp | Type | Brand | Series |
|---|---|---|---|---|---|---|---|---|---|---|---|
| C6 | 1 | 330 µF | 200 V | Through Hole | 22 mm | 30 mm | 10 mm | 105 °C | Aluminum Electrolytic | Rubycon | MXR |
| C7 | 1 | 4.7 µF | 350 V | Through Hole | 10 mm | 16 mm | 5 mm | 105 °C | Aluminum Electrolytic | Elna | RJ3 |
| C9 | 1 | 47 µF | 50 V | Through Hole | 7 mm | 12 mm | 3 mm | 105 °C | Aluminum Electrolytic | Sanyo | SE |
| C12 | 1 | 1000 µF | 35 V | Through Hole | 12.5 mm | 20 mm | 5 mm | 105 °C | Aluminum Electrolytic | Nippon Chemi-Con | KMG |
| C14 | 1 | 1000 µF | 16 V | Through Hole | 10 mm | 16 mm | 5 mm | 105 °C | Aluminum Electrolytic | Nippon Chemi-Con | KMG |
| C16 | 1 | 6800 µF | 10 V | Through Hole | 14 mm | 38 mm | 5 mm | 105 °C | Aluminum Electrolytic | Nichicon | VZ(M) |
| C17 | 1 | 3300 µF | 10 V | Through Hole | 14 mm | 22 mm | 5 mm | 105 °C | Aluminum Electrolytic | Sanyo | SE |
| C19, C21 | 2 | 10 µF | 50 V | Through Hole | 5 mm | 12 mm | 2 mm | 105 °C | Aluminum Electrolytic | Sanyo | SE |
C9, C16, C17, and C21 were the capacitors that let out electrolyte on a PSU with date code 102004511. Additionally, C6 (the huge expensive one) tested at 315 µF (-5%, the part has a 20% tolerance), and probably does not need replaced.
Fan
The original fan is a 12 V brushless DC fan, 65 mm × 15 mm. It is manufactured by UCE Ltd. Japan and has model number F614-D12L-02. It is connected to the power supply PCB by a 2 pin JST-style connector (either PH or XH, but I cannot determine with certainty what the pitch is).
Replacement Parts
Power Supply PCB
| RefDes | Qty | Compatible Part Number | Order Links |
|---|---|---|---|
| C6 | 1 | Wurth Elektronik 860241081001 | Mouser |
| C7 | 1 | Wurth Elektronik 860131275004 | Mouser |
| C9 | 1 | Wurth Elektronik 860020673013 | Mouser |
| C12 | 1 | Wurth Elektronik 860020578018 | Mouser |
| C14 | 1 | Wurth Elektronik 860020375017 | Mouser |
| C16 | 1 | Wurth Elektronik 860020280027 | Mouser |
| C17 | 1 | Wurth Elektronik 860020278023 | Mouser |
| C19, C21 | 2 | Wurth Elektronik 860020672010 | Mouser |
| Full BOM | Mouser | ||
If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.