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:
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
