Kuze: /* model3 sound amp */

2018-03-03T20:15:20Z

model3 sound amp

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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.

<gallery>
File:Blast_city_psu_inside.jpg
File:Blast_city_psu_inside_2.jpg
File:Blast_city_psu_outside.jpg
File:Blast_city_psu_outside_2.jpg
</gallery>

== Amplifier ==
The model 3 amplifier ( SEGA # 838-12796 ) handles both stereo/JVS and mono/JAMMA amplification. This amplifier was used in many sega cabinets.
<gallery>
File:sega_model3_amp.jpg
</gallery>

{| class="wikitable"
|-
! CN1 || JST VH
|-
| 1 || AC 18v
|-
| 2 || GND
|-
| 3 || AC 18v
|}

{| class="wikitable"
|-
! 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
|}

{| class="wikitable"
|-
! CN3 !! JST NH
|-
| 1 || JAMMA SND
|-
| 2 || JAMMA SND
|-
| 3 || JVS L+
|-
| 4 || JVS L-
|-
| 5 || JVS R-
|-
| 6 || JVS R+
|}

{| class="wikitable"
|-
! 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 ===
{| class="wikitable"
|-
! 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

{| class="wikitable"
|-
! 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 ==

Sega Blast City PSU - Revision history

Kuze: /* model3 sound amp */