Astro Fighter
Gremlin and DECO version differences
If you have a DECO version of Astro Fighter, the boards are not totally interchangeable with those from the more common Gremlin version.
Below are the differences as I’ve been able to ascertain.
I/O Board:
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DO NOT PLUG a Sega I/O board into a DECO cabinet – It seems to do bad things to the monitor!!
Sega CPU and ROM/Sound board can be switched as matched pairs into a DECO cabinet with the following issues:
- The screen is upside down
- There is no sound
CPU Board:
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Sega board has the following additional changes:
Parts Side:
- wire patch: 4L pin 8&9 (wire touches both pins) to 5J pin 3
- Leg Lifted 5J pin 3
- wire patch: 4L pin 10 to 5J pin 12
- trace cut: above #6 at A6
- trace cut between legs 10&11 of IC A6
- trace bridged with solder from 6H pin 3 to 6F pin 4
- trace cut: from 6H pin 4
Solder Side:
- Both boards have a wire patch from Edge Connector 3A to 5B pin 7
- wire patch: Right side of [Cap 6A] to IC 6A pin 5
- wire patch: 6A pin 6 to 4A pin 5
- trace cut: 6B between pins 3 and 4
- solder bridge 6A pins 3&4
- wire patch: Edge Connector 2A to E4 middle of the CPU chip (which has a trace going to pin 7 of E3)
- wire patch: Edge Connector 19A to F6 pin 8
ROM Board:
DECO and Gremlin- DE-1022B-2
Sega board has the following additional changes:
Solder Side:
- wire patch from M3 pin 14 to Edge Connector 3A
- wire patch from M5 pin 2 to Edge Connector 2A
Sound Board:
DECO and Gremlin-DE-0038B-1
Sega board has the following items removed/changed:
Parts Side:
- Removed: VR2 a 10K POT similar to VR1
- Removed: C78 220mfd @ 16V
- Removed: C76 100uf @25V
- trace cut between pin 1 of IC15 (the Amp) and + of C76
- Removed: C72 220mfd @16V
- wire patch from pin 1 of VR2 to (-) side of C78
Solder Side:
- wire patch: CNB (Ribbon Connector) Pin 2 to IC3 pin 1
- trace cut between CNA (Ribbon Connector) pin 1 and IC 3 pin 1
- trace cut at CNB pin 1