Sega Blast City PSU

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Overview

The blast city's PSU combines a standard model 3 sound amplifier and model 3 PSU in one box. It 5v & 3.3v adjustment pots. Although it is technically a 100v PSU, it works fine with 110-120v power.

Amplifier

The model 3 amplifier ( SEGA # 838-12796 ) handles both stereo/JVS and mono/JAMMA amplification. This amplifier was used in many sega cabinets.

CN1 JST VH
1 AC 18v
2 GND
3 AC 18v
CN2 JST NH
1 Volume pot Leg 1
2 loop to 3
3 loop to 2
4 Volume pot tap
5 Volume pot Leg 2
CN3 JST NH
1 JAMMA SND
2 JAMMA SND
3 JVS L+
4 JVS L-
5 JVS R-
6 JVS R+
CN4 JST VH
1 SPK R+
2 SPK R-
3 SPK L-
4 SPK L+

Fan

brushless 12v , 0.13A 80mm fan with a 2-Pin 7mm ( JST PH ) connector. This is a low amperage fan. known replacements:

  • Evercool PSU-REP-2PIN7MM

capacitor list

model3 sound amp

QTY Location Specification Suitable Digi-Key Part Number
2 C1,C2 35v 4700uf 493-1325-ND
2 C3,C4 50v 100uf 565-1340-ND
4 C13,C14,C15,C17 50v 10uf 565-1336-ND
2 C21,C22 50v 1uf 565-1332-ND
2 C23,C25 50v 33uf 565-1338-ND
4 C16,C18,C19,C20 50v 2.2uf 565-1333-ND

psu

Original KME series caps are discontinued. specs are here https://www.westfloridacomponents.com/mm5/graphics/datasheets/3/KME-Series-Nippon-Chemi-Con.pdf

qty location voltage capacitance lead spacing ( mm ) replacement
1 C25 25v 100uf 2.5 EKY-250ETD101MF11D
3 C31,C39,C40 10v 6800uf 7.5 UVY1A682MHD1TN
1 C24 16v 2200uf 5 UVK1C222MPD1TD
2 C36,C44 50v 0.47uf 2 UVR1HR47MDD1TD , 860020672004
2 C16,C11 50v 10uf 2 UVZ1H100MDD1TD
1 C12 50v 1uf 2 ULD1H010MDD1TD
1 C14 35v 47uf 2.5 URZ1V470MDD1TD
1 C20 35v 22uf 2 UVZ1V220MDD1TD
1 C5 200v 820uf 10 LGN2P821MELC25

Fuse