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Author Topic: Sys 80 Non CPU boot/IRQ issue  (Read 2251 times)

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Offline MartyJ

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Sys 80 Non CPU boot/IRQ issue
« on: May 10, 2009, 03:56:15 PM »
Hi Guys,

I've got my powersupply rebuilt and are now getting correct voltages.  I've done all ground mods for both powersupply and MPU (driver board out for time being)...Is setup on work bench with power section from cabinet (caps replaced, bridges tested etc..)...

I am not getting any display what so ever.  From the PinRepair guide (still learning how to use logic probe correctly), but it would appear that CPU board is booting OK.

I tested voltages at pin 17 and is 60v...

I disconnected one and tried the recharge with a 9v battery and don't get anything out of the display.  I tested the UDN6118 on this display and they seem to be OK...

Any suggestions would be appreciated!
« Last Edit: May 12, 2009, 09:34:35 PM by MartyJ »
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Offline ajlaird

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Re: Sys 80 Displays
« Reply #1 on: May 10, 2009, 04:32:53 PM »
Do you know if the displays are supposed to be working? If possible, get hold of a known working display and hook it up to test.
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Offline MartyJ

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Re: Sys 80 Displays
« Reply #2 on: May 10, 2009, 04:58:20 PM »
No.  Not sure about any of them.

Machine was sold 'as is', not tested and this was how I requested it.  (as a project for me)...Was fully explained and understood by me that machine NOT tested or powered on prior to purchase..I was happy to roll the dice with a BH and thus far (touches wood) has worked out very nicely with almost all components/parts checking out fine....

At this stage I'm leaning towards the fact that perhaps all displays are shot.  Just looking for confirmation on how to test this..From reading the old 9v (and have tried 12v from new cap) and I'm not getting those funky red lines to heat up.  This indicates a problem AFAIK.

I guess its possible that they are all gassed out but I don't know enough about them to speculate..

Solid 60vDC to each connector for displays too.  Grounds buzz out fine on all too...
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Offline ajlaird

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Re: Sys 80 Displays
« Reply #3 on: May 10, 2009, 05:01:55 PM »
Won't hurt too much to get some second-hand ones, I reckon.
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Offline MartyJ

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Re: Sys 80 Displays
« Reply #4 on: May 10, 2009, 05:06:34 PM »
Quote from: ajlaird on May 10, 2009, 05:01:55 PM
Won't hurt too much to get some second-hand ones, I reckon.

Agreed.

I'm having a look around for one in the mean time....

Not sure if you can get LED replacements for Gottliebs either.....I was a big fan of the PinScore I put on my PF.
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Offline MartyJ

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Re: Sys 80 Displays
« Reply #5 on: May 10, 2009, 05:32:27 PM »
My alligator lead was down to 1 strand so that has been fixed and elements within at least 4/5 displays are glowing....Sooo, rather than take a shotgun method to replacing parts I will try to nut it out.

I have some schematics but I need to print them out on A3 but don't have those facilities with me....From reading U5 RIOT is a suspect...
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Offline ddstoys

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Re: Sys 80 Displays
« Reply #6 on: May 10, 2009, 05:48:16 PM »
Would be strange for all displays to be dead so i think your on the right track
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Offline ajlaird

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Re: Sys 80 Displays
« Reply #7 on: May 10, 2009, 06:28:15 PM »
Quote from: MartyJ on May 10, 2009, 05:32:27 PM
My alligator lead was down to 1 strand so that has been fixed and elements within at least 4/5 displays are glowing....Sooo, rather than take a shotgun method to replacing parts I will try to nut it out.

I have some schematics but I need to print them out on A3 but don't have those facilities with me....From reading U5 RIOT is a suspect...

Ah, the old one-strand alligator lead will always cause problems.

From what I have heard on this forum, the RIOT chips are often suspect.
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Offline MartyJ

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Re: Sys 80 Displays
« Reply #8 on: May 10, 2009, 07:01:05 PM »
U5 done.  Nil value.
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Offline ddstoys

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Re: Sys 80 Displays
« Reply #9 on: May 10, 2009, 07:07:47 PM »
My Cpu also seems to be booting as per clays guide but i also get nothing so hopefully i get something once the brand new cpu arrives?
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Offline MartyJ

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Re: Sys 80 Displays
« Reply #10 on: May 10, 2009, 07:28:48 PM »
IF I was getting junk or partial's, at least I would know where to start.

Voltages across pin 34 of RIOTS appears to be OK as well.

 @@^
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Offline The pinballist formally known as Dean Morgan

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Re: Sys 80 Displays
« Reply #11 on: May 10, 2009, 08:32:50 PM »
I would be pretty sure that most of your displays are Ok.. If you have the lines glowing and they are straight lines and not pulsating when you added your 9 volts to the two outer pins then there probably Ok.   I would seriusly doubt that all displays would be faulty.. These FUTABA displays far outweighed the Bally/Stern displays of the same era for longgeviti...

Dean
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Offline MartyJ

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Re: Sys 80 Displays
« Reply #12 on: May 10, 2009, 08:37:23 PM »
Quote from: Dean Morgan on May 10, 2009, 08:32:50 PM
I would be pretty sure that most of your displays are Ok.. If you have the lines glowing and they are straight lines and not pulsating when you added your 9 volts to the two outer pins then there probably Ok.   I would seriusly doubt that all displays would be faulty.. These FUTABA displays far outweighed the Bally/Stern displays of the same era for longgeviti...

Dean

Thanks Dean,

Initially when I was not getting anything, I thought it may be displays....Faulty alligator clip later and that side sorted.  Still no displays at all.

Welcome to System 80!

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Offline The pinballist formally known as Dean Morgan

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Re: Sys 80 Displays
« Reply #13 on: May 10, 2009, 08:51:14 PM »
Sounds like the CPU is not booting
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Offline The pinballist formally known as Dean Morgan

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Re: Sys 80 Displays
« Reply #14 on: May 10, 2009, 08:53:15 PM »
Have you checked the filiment voltage?

5v AC across pins 13 and 3 of A14 P1??
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