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  chess challanger 7 Model BCC power supply polarity
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   Author  Topic: chess challanger 7 Model BCC power supply polarity  (Read 1337 times)
knighted
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Re:chess challanger 7 Model BCC power supply polarity
« on: June 7, 2010, 08:51PM »
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thanks for everyone,s input. unit seems to work properly in level 1 game. i,ll try and run it at lower voltage and see how that works. James
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Re:chess challanger 7 Model BCC power supply polarity
« Reply #1 on: June 7, 2010, 07:23AM »
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Quote from: Larryh71 on June  7, 2010, 12:26AM   

Do yourself a favor and go out and
buy a regulated adaptor. If the adaptor output is stated to be
9volt, then you should be able to put a voltmeter on it and have
it read 9volt. The original Fidelity adaptors are likely to read
12 volts when checked with a voltmeter, so steer clear of them.
A good regulated adaptor with an adjustable voltage will put
your mind at ease for many years, especially if you maintain a
chess computer collection.
hope this helps,
Larry


A bit of clarification is needed on voltage regulation:

The original 9 volt Fidelity adaptors are fine - no need to get a regulated adaptor, as all the Fidelity computers using this adaptor have the regulator built into the computer itself. The 12 volts you measure at the tip (positive tip, negative collar) is the OPEN CIRCUIT voltage. The computer loads this down and the voltage decreases to about 9 to 10 volts when it is plugged into the Chess Challenger 7 and it powers up. The microcomputer runs on regulated 5 volts, and that internal regulator needs at least 7 volts under load from the external adaptor to function properly. Any voltage above 7 volts is dissipated as extra heat due to the current draw in the computer, but these computers are designed to run well with the original 9 volt adaptor.

I have used a 6 volt adaptor with my CC7 and it works fine (the voltage going into the jack was actually about 7 volts), and the computer runs cooler than when using the original 9 volt. Lower voltage adaptors are fine, if they are rated for at least 350mA.  Steer clear of any 9 volt unregulated adaptor that is rated for more than 350mA. In those cases, the computer will not pull the voltage down enough and the 12 volts will cause your computer to run warmer than it was designed for and may shorten its life. 

Hope that clarification helps.
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Larryh71
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Re:chess challanger 7 Model BCC power supply polarity
« Reply #2 on: June 7, 2010, 12:26AM »
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Quote from: knighted on June  6, 2010, 09:19PM   

Could someone tell me what the pin polarity is on the  9 volt power supply for this unit. alas it did,nt come with power supply and i don,t want to guess. i have fidelty 9 volt power supply for fidelty checkers but they say different units used different power supplies. Thanks James

Hi,I can tell you with certainty that the correct adaptor is
output 9voltDC positive tip. Do yourself a favor and go out and
buy a regulated adaptor. If the adaptor output is stated to be
9volt, then you should be able to put a voltmeter on it and have
it read 9volt. The original Fidelity adaptors are likely to read
12 volts when checked with a voltmeter, so steer clear of them.
A good regulated adaptor with an adjustable voltage will put
your mind at ease for many years, especially if you maintain a
chess computer collection.
hope this helps,
Larry
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Robert Weck
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Re:chess challanger 7 Model BCC power supply polarity
« Reply #3 on: June 6, 2010, 11:54PM »
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Hello James,


Quote from: knighted on June  6, 2010, 09:19PM   

Could someone tell me what the pin polarity is on the  9 volt power supply for this unit. alas it did,nt come with power supply and i don,t want to guess. i have fidelty 9 volt power supply for fidelty checkers but they say different units used different power supplies. Thanks James

i'm not absolutely sure (as i don't own a CC7), but the early Fidelity models had AC power supply; so if you want to connect a DC adaptor, you don't have to worry about the polarity (the other way round (means connecting an AC adaptor to a DC device) would lead to desaster! also DC with wrong polarity)

If the CC7's connector looks like this http://www.flickr.com/photos/10261668@N05/859032386/in/set-72157600922170604/ then it is surely AC!

Maybe there is a sticker on the bottom, that tells, if it is AC or DC?


regards,
Robert
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knighted
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chess challanger 7 Model BCC power supply polarity
« Reply #4 on: June 6, 2010, 09:19PM »
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Could someone tell me what the pin polarity is on the  9 volt power supply for this unit. alas it did,nt come with power supply and i don,t want to guess. i have fidelty 9 volt power supply for fidelty checkers but they say different units used different power supplies. Thanks James
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