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Author Topic: Omega Race  (Read 15416 times)

vernimark

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Re: Omega Race
« Reply #15 on: October 06, 2016, 08:11:05 PM »
THis is the result reassembling all the parts
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Luigi

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Re: Omega Race
« Reply #16 on: October 06, 2016, 09:37:13 PM »
un pezzo splendido  :-*
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Etienne MacGyver

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Re: Omega Race
« Reply #17 on: October 07, 2016, 10:47:19 AM »
WOW !
Nice work Marco !  :spaceace: :spaceace:
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vernimark

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Re: Omega Race
« Reply #18 on: October 07, 2016, 01:16:24 PM »
thank you! It's a long time I didn't spend my nights with my kids :D
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vernimark

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Re: Omega Race
« Reply #19 on: October 12, 2016, 01:31:37 PM »
Easy job for the CP glass.
Just replaced the lamp.

Black light had the ballast gone. Taken one from the star castle that is waiting for better days.
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vernimark

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Re: Omega Race
« Reply #20 on: October 12, 2016, 01:50:18 PM »
About the CP: I just
- cleaned the surface
- re painted the screws
- cleaned the know and sprayed with transparent pain



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vernimark

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Re: Omega Race
« Reply #21 on: October 12, 2016, 01:54:38 PM »
the result
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vernimark

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Re: Omega Race
« Reply #22 on: October 27, 2016, 05:18:55 PM »
"t-molding"

actually this cab hasn't a real t-molding

these were the conditions
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vernimark

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Re: Omega Race
« Reply #23 on: October 27, 2016, 05:20:40 PM »
I sand, painted with flatting and re-painted in glossy black (for the edges), satin black for the internal part of both sides.

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vernimark

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Re: Omega Race
« Reply #24 on: October 27, 2016, 06:09:49 PM »
I repainted both sides preserving the stickers using spray flatting and a normal satin black paint

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vernimark

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Re: Omega Race
« Reply #25 on: October 27, 2016, 06:10:34 PM »
ok, the cabinet is ready now it's time to repair the acid-damaged board....  :shock:
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vernimark

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Re: Omega Race
« Reply #26 on: October 27, 2016, 06:45:44 PM »
The board has been damaged by the acid and I realized the entity of the damage once I removed all sockets.

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vernimark

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Re: Omega Race
« Reply #27 on: October 27, 2016, 06:47:14 PM »
I tried to remove all corroded parts
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vernimark

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Re: Omega Race
« Reply #28 on: October 27, 2016, 06:48:28 PM »
...some tracks have gone...
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vernimark

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Re: Omega Race
« Reply #29 on: November 10, 2016, 05:37:00 PM »
ok.
I proceeded soldering all sockets and rebuilding tracks.
Actually I had to take a pic of each IC position so I could test one by one the broken connections once the socket has been installed.

Plugging the board I had a good surprise because the game started BUT after few seconds the vectors hide for a while.

Running the self test I have the following errors:

BBU RAM S4: BAD
V RAM2 J1 and or (L/M)1: BAD
V RAM4 (J/K)1 and/or (N/P)1: BAD
V ROM2 F1: BAD
Actually not so bad.

 

All the  RAMs/ROM (but BBU RAM) share the VECTOR ADDRESS BUS, from SMEM0 to SMEM9 controlled by 74157 in positions K3, L3, M3.

 

MAIN ADDRESS BUS (MA0..9) and PROGRAM ADDRESS BUS (SEQA0..9) are connected to these 74157

 

I can see BBU RAM (5101) uses the MAIN ADDRESS BUS too, so I’ll check if S4 pins 1, 2, 3, 4, 5, 6, 7 and 21 are correctly on the bus and if all lines arrive to 74244 in (P/N)6 (pins 3, 5, 7, 9, 12, 14,16,18). This will be the first test I’ll perform.

I think I'm close to have Omega Race working again  :lol:

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