Tottori Sanyo SPS-356JU (Sega Tera Drive Power Supply)

For more information, see this article's corresponding Wikipedia page: TeraDrive.

Tottori Sanyo SPS-356JU

Preliminary Information
Release Year	1991
Leak Risk	High
Batteries	None
Capacitor Types	Through Hole
Destructive Entry	No

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

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

Capacitor Specifications and Footprint Information

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.

Replacement Parts

Power Supply PCB

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
			Digikey

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.