Re: Atari STUNT CYCLE - service bulletins?

Rodger Boots wrote:
>
> Schematic says 4066, not 4016. Pretty much the same thing, but 4016s
> are more likely to fail, don't remember why exactly.
>

Ah (back at the shop) my schematic for Stunt Cycle and the logic board
both had a 4016, not 4066. Perhaps you have a later version...they may
have upgraded to the 4066 if the 4016 was not as reliable as you suggest.

John :-#)#
>> On Aug 7, 2010 2:54 PM, "John Robertson" <pinball@telus.net
>> <mailto:pinball@telus.net>> wrote:
>>
>> John Robertson wrote:
>> >
>> > Rodger Boots wrote:
>> >>
>> >> My God, that is one total abortion of what shoul...
>>
>> Actually it turned out to be a defective 4016 CMOS switch! I was not
>> paying attention to the fact that adjusting the added trim pot
>> changed the idle and run speed of the motorcycle. This trim pot is
>> only supposed to be effective on the higher wheelie and sets the
>> maximum speed of the bike. What was happening was the 4016 was
>> behaving as if it had both switches closed leaving the bike always
>> running in high gear and hence unable to accelerate correctly -
>> leading to the inability to jump more than 15 or so buses. Now it
>> jumps just to the right edge of the screen at maximum acceleration,
>> throttle wound open keeping the bike in the highest wheelie without
>> flipping over.
>>
>> Game now works well, customer will be pleased, I certainly am happy
>> to have figured it out - just wish I hadn't wasted so much time
>> thinking it was a bad transistor...turns out the 2N3565 can be
>> substituted by other similar NPN transistors with little effect on
>> the acceleration range/speed.
>>
>> John :-#)#
>>
>>
>> >
>> >
>> > Hi Roger,
>> >
>> > It IS a very nasty circuit...I've been trying to repair one here,
>> can't get it ...
>>

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                 www.flippers.com 
"Old pinballers never die, they just flip out"
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