I'm working on a Stern Flight 2000 and all the EPROMS don't have covers on the glass windows. I happened to be working in the garage on Sunday - nice and sunny - when all of a sudden the voice component of the audio is gone...
If the chip failed, would this nuke my speech card?
Always cover the little glass windows after "burning", with a label, or electrical tape at worst. Light sensitive gadgets. Your "card" should be OK, but maybe not the sound ROMs. Erase and "reburn" to find out.
Toujours à la recherche de vos histoires liant Montréal et les machines à boules. Always looking for your Montreal based pinball stories.
Not to sounds like a sour-puss, but it would take over 3 weeks at full sun exposure to start to cause erasure on an eprom.
The eprom could be bad, but I don't think it's from the sun...
And no, a bad eprom will not damage a board.
Cheers, Steph
"I could be right I could be wrong\crazy", isn't that a Billy Joel song ? Jeez, when you start hearing that crap in your thoughts it is time for some sleep.
Good night Nelly.
Toujours à la recherche de vos histoires liant Montréal et les machines à boules. Always looking for your Montreal based pinball stories.
OK, so I'll troubleshoot the board first and then start pointing fingers at the EPROM.
put your finger on the amp transistor if it make noise it mean that part is working if you can't get noise..look fot amplification and wirering or suply
NO MATER HOW MUCH YOU PAID FOR SOMETHING...THE ONES YOU WILL REMEMBER IS.... WHAT WAS FREE
1- Check all cabling and connectors between the MPU, lamp driver and main sound card, and also to the VSU-100 speech board. Make sure the VSU-100 board gets +5V.
2- Check for cold solder joints under the header pins for the sound card & speech board.
3- try replacing Eproms on the VSU-100
4- the large chip often fails on the VSU-100... This part is getting difficult to find...
Good luck ! - Sylvain.
Looking for 1966 Bally Capersville, 1967 Bally The Wiggler, 1981 Stern Viper, 1986 Pinstar Gamatron, 1986 Williams Grand Lizard, 1991 Williams Bride of Pinbot, and a few others. Cash or some trades available. Could also repair a machine of yours +/-$ if needed, in exchange for one machine on my want list, non-working/unshopped welcome!
Probably a mistake in the TP1/2 designation either on the board, or on the schematics.
From the look of it, it appears that TP1 is actually ground (OK if you measure 0.08 V DC). TP2 is a tad high at +5.3V but I suspect it should be OK.
TP3 is definitely wrong. Make sure you have GI (6.3VAC) feeding J3-1 on the VSU-100. Otherwise you may have a bad diode or cap in the -10V supply circuit.
- Sylvain.
Looking for 1966 Bally Capersville, 1967 Bally The Wiggler, 1981 Stern Viper, 1986 Pinstar Gamatron, 1986 Williams Grand Lizard, 1991 Williams Bride of Pinbot, and a few others. Cash or some trades available. Could also repair a machine of yours +/-$ if needed, in exchange for one machine on my want list, non-working/unshopped welcome!
Did you set your meter to measure in AC volts (as opposed to DC) ?
Looking for 1966 Bally Capersville, 1967 Bally The Wiggler, 1981 Stern Viper, 1986 Pinstar Gamatron, 1986 Williams Grand Lizard, 1991 Williams Bride of Pinbot, and a few others. Cash or some trades available. Could also repair a machine of yours +/-$ if needed, in exchange for one machine on my want list, non-working/unshopped welcome!
Good news on this one - traced the wiring all the way back to the rectifier board - the GI circuit was split between 2 fuses for some reason. Unhacked the hack and now the Voice synthesizer works! I'm going to order a new rectifier from GPE this morning.
sentinelking
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