re: power transistors

It's more a question of whether they are better engineered now then
before. Maybe the manufacturing process now is much more reliable then 20
years ago. Less defects should produce a more reliable product. I guess
I'll just try them out and see how it goes.

-Werner

At 09:04 AM 10/22/2001 -0700, you wrote:
>Transistors don't age if not used. Unless they are dropped...as I
>mentioned before the typical cause of XY output transistor failure is
>ground faults between the power supply, MPU/Video and the monitor. Beef
>the ground (common) connections up with jumper wires that can handle the
>current- a couple of 18 gauge wires at least.
>
>John :-#)#
>
>At 08:42 AM 10/22/01, you wrote:
>>I don't think a mathbox error will force a reset. I haven't looked into
>>it for a while but your problem sounds more like a RAM or possibly ROM
>>error (IC socket?) in the front end of the system. Do you get the correct
>>self test screen? Or do you get the beeps? Check the manual for the audio
>>error codes.
>>
>>John :-#)#
>>
>>At 08:22 AM 10/22/01, you wrote:
>>>I think my board is continually getting reset by the watchdog. I get
>>>about 90% of a Tempest logo on the screen (upside down) and then it
>>>redraws. So when I hit the test switch, it's behaving like a power-on
>>>reset. I'll disable the watchdog and see if I can get into test
>>>mode. I'm guessing the mathbox board is having problems (upside down
>>>screen) plus Clay's menu works fine but the game itself doesn't run.
>>>
>>>-Werner
>>>
>>>At 10:12 AM 10/22/2001 -0400, you wrote:
>>>>On Sat, 20 Oct 2001, Werner Sharp wrote:
>>>>
>>>> > My Tempest died today and I have Clay's multigame kit installed. Is
>>>> there
>>>> > a way to get into the self-test screen? Using the self-test button
>>>> inside
>>>> > the coin door just gets me to the multigame menu, which works fine. I
>>>> > searched the archives but didn't see the answer.
>>>>
>>>>Dang -- I know I've done this. Wait- - on mine, hitting the self-test
>>>>switch
>>>>puts me in self-test mode. You have to do a reset (or power-on) while the
>>>>self-test is on to get to the menu.
>>>>
>>>>Maybe this is an indication of how your machine is broken -- or you are
>>>>powering-on while in self-test.
>>>>
>>>>==========================================================
>>>>Chris Candreva -- chris@westnet.com -- (914) 967-7816
>>>>WestNet Internet Services of Westchester
>>>>http://www.westnet.com/
>>>>
>>>>---------------------------------------------------------------------------
>
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Received on Mon Oct 22 10:06:41 2001