Re: Hardware Diagnostics Tests on a Star Wars board, how does it work?

Try this oppisite of the way you are doing now. You probably have Off/On mistaken. (I've done this myself so many times I lost
count)

Once you have it in the right position, a number should display in the center of the screen. ie 15 for test 15.

JB

Marc Alexander wrote:

> I'm repairing a Star Wars board set that has Matrix Errors in the
> normal self test (amongst other now repaired faults), and I can't
> seem to get the 'Hardware Diagnostics Tests' via DIP switches working
> properly via the option switches and grounding of the DIAGN test point.
>
> I am setting the option switches (SW2 at 10D) correctly to the requested
> tests 15-20 by the normal self test error screen, and all I get is the
> 3 LED's flashing continuously (manual says this is 'unimplemented position')
> and no test number shown on the display either (which is a CRO in XY at the moment)
>
> I have tried this on a good working board also, and it does the same thing so I
> figure I must be doing something wrong or unexpected to get these test working properly.
> I've tried the switch positions reversed, and even the other switches SW3 at 10E just in case.
>
> The manual says(and I am doing):
> 1. Set the Self-Test switch to the on (up) position. (I assume this means Self Test input to GND?)
> 2. Ground the DIAGN test point on the Main PCB.
> 3. Set the option switches as indicated in the test procedure and momentarily ground the RESET test point on the Main PCB.
> If an unimplemented switch position is selected, LED 1, 2, and 3 on the Main PCB will all flash on and off about
> once per second.
> Also, the display will show the number of the test for Hardware Diagnostic Tests 10 through 26 (if
> the AVG PCB and display are working).
>
> BTW, the problem on the faulty board is no stars or ships in gameplay, picture & music hangs
> once death star is shown, but can still fire and see shots (I assume matrix errors are hanging it up)
> When in normal self test, matrix errors listed correspond with tests 15 to 20 in the
> Troubleshooting manual.
> Problem is on the Main PCB (Rev A), RAM's are OK, Vector PROM's are ok, asst. other IC's so far
> tested in the Matrix section are ok, but not done them all yet.
>
> Arrrgghh, what am I doing wrong? ;-)
>
> Thanks very much,
>
> Marc
>
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Received on Wed Apr 3 17:29:31 2002