Flight 2000
Stern Electronics, 1980You're currently viewing posts by Pinsider emsrph.
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Quoted from tyking:Okay this just got real difficult real quick. Not sure how to test the MPU J4 for this signal changing state.
A logic probe is what is needed here. Not expensive or difficult to use.
I had a known good speech chip and known good EPROM and Quench helped me figure out what was wrong with my board https://pinside.com/pinball/forum/topic/need-vsu-100-troubleshooting-help
Quoted from tyking:I found some on amazon. What about this one: Elenco Electronics Lp-560 Logic Probe Electronics Testing Tool
Several people have recommended that one. Here’s a link with tutorials https://pinside.com/pinball/forum/topic/quick-logic-probe-questions#post-2717249
Quoted from tyking:Is there a way to check this jumper wire to verify that it is operational. I am assuming using the DMM on ohms to do a continuity check from one end of the wire to the other. If I see “resistance” in the form of Ohms does that tell me that the wire is installed properly? Thanks
If you see no resistance the jumper is not broken internally. Post a picture of the back of the board.
Quoted from tyking:Here is the back of the SBU and the VSU
Hard to see at that resolution- does it match the picture in post #59?. Mine is a later revision without jumper.
It should connect J3-5 and the top of C14. This can be verified with your meter on continuity or resistance (ohms).
Quoted from tyking:Not sure if I am testing it right b/c I put the DMM on ohms (levels between 200 and 200k). I put one end on J3-5 and the other on the top of C14. The DMM is automatically at 1 with no contact. When contact is made, it reads at some number e.g. 12 on level 20k, and then goes down to 0 and stays there.
Here are close ups
Looks correct. Typically an IC chip goes bad and needs replaced. The purpose of the logic probe is to determine which one.
Quoted from tyking:I got the logic probe, and started probing around the IC’s with the pin in attract mode, and just noted the signal, I.e. high, low, or pulse. With this information alone, would I be able to determine anything useful? One thing that I noted, for example, is that of all the pins on the IC’s only one results in a “sound” when contact is made with the logic probe (which is like a hum/buzz of sorts). Does that mean anything useful? Thanks
Some probing is done during booting but most during the solenoid test when the game runs through speech test. Do you have the manual? Look at the testing process referenced at the start of this post and the thread I linked in post #97. That should give you a place to start.
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Crown Point, IN