Sega Model 2B

[simon_m74]

Hi all,
I have Inday 500 that is tempormental.
I have 2 other Model 2B boards - that currently dont boot.

Does anyone knmow what the array of 8 LED`s mean.
Red, Red, Red, Red
Red,Green,Red,Green

Both boards just light the line of 4 red LEDs, and do nothing else.

Ideas ?

 

[simon_m74]

right.
I was using my bench PSU to power the boards for testing.
measured voltage - only 2.6 at board, so the PSU was not able to power the system well.
I up`d the voltage and ampage so that my meter read 4.8v (highest I got before the PSU cables started to smoke!)
At that point - 4 red went out, and 2 green on.... but no video out (although I do need to test my video cable)

With 2 green ( as well as the singular red on - on another part pf the board) - does that mean ok?

I`m going to take it to the Retro Computer Museum soon, and plug it in place of one of the Indy 500 boards - to see if it boots.

 

[Sbdesign]

I think they are static on 2d and when 3d comes on they flash all over the place

Sorry I can’t help further than that

 

[Mc-Q]

i need to make an ATX to M2/3 loom this week,
if i get it done i'll document the led behaviour at the weekend.
not sure if i can crimp the jst's with what i have though!

 

[channel27]

I had my Sega test rig out this evening to check some Daytona boards and the Indy 500 I'd got last week was still to hand so I thought I'd plug it in and take a video of the LEDs.
I've no idea what the LEDs mean but here's it starting up and going into the attract sequence.
I assuming green / flashing green means good, but the reds change in sequence too?
(I wish I'd plugged the speakers in now because the music is fantastic )

https://flic.kr/p/2pFCBo7

 

[Mc-Q]

if you go into test mode the leds may respond to differeent types of test

 

[channel27]

The LEDs don’t change during either of the self tests. They pause however they were when the test button was pressed and only reset when exiting the menu.

 

[Mc-Q]

thats anoying, i was hoping it would show if they related to the 3d vs bitplane gfx or something.

 

[simon_m74]

I have 2 working (ish) Indy 5000 machines.
Ish:
First: Doesnt always boot - sometimes first time, sometimes it just says `FREE PLAY` but noting else. When it does this it can take up to 6-8 reboots till it turns on properly.
Other: No Audio or Force Feedback - but currenlty the 240v>100/12.8v Transformer is being checked.

Either - will not network!

I`ve been working on the `third` indy board, to try to see if that helps the issues with the booting issue or maybe even the networking

 

[Mc-Q]

start with checking the psu - always.
if you have a scope - scope it.
if not, set your meter to AC and check the dc voltages - the meter will show the ripple(noise) that the capacitors are failing to catch.

 

[simon_m74]

I put that (booting issue) board in the other machine to diag if it was the PSU or not - but the probel carried over to the other machine,
The one I tried it in is being powered by an ATX PSU.

 

[Mc-Q]

take a close look at the power connectors on the filter board, i have a 2b here with burned pins so i know it happens