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Conference 7.286::atarist

Title:Atari ST, TT, & Falcon
Notice:Please read note 1.0 and its replies before posting!
Moderator:FUNYET::ANDERSON
Created:Mon Apr 04 1988
Last Modified:Tue May 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1433
Total number of notes:10312

1376.0. "Help with resistor values" by UFHIS::BFALKENSTEIN () Tue Aug 03 1993 11:30

    
    Hi,
    
    my dad blew up some resistors in his Atari 1040STF. I got some
    schematics, but not those of this revision: C070859-001, Rev.2.1.
    
    Maybe there is somebody out there who can help me with the values
    of the following resistors in the Video-Shifter area:
    
    R46, R47, R52, R53 (codes not longer readable ;-). They seem to be 
    responsible for color video output, because red and blue are missing 
    on the monitor. Btw, this is a PAL machine...
    
    Any help greatly appreciated,
    Bernd
    
                         
T.RTitleUserPersonal
Name
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1376.1Some resistor values.IJSAPL::KDEVRIESKees de VriesFri Aug 13 1993 06:2818
Bernd 

I have found some values for you

	R46 24K Ohm Green video
	R47 24K Ohm Blue Video
Strange because you say Red and Blue are missing.

	R52  150 Ohm
	R53  3.6 K Ohm    
The last two resistors are in the 32 Mhz clockcircuit.

Also strange as far as I can see , if these two are broken, your
machine should completely dead, no clocksignals any more!
                         
My diagrams are for 1040 STFM C070522 REV a.

Kees de Vries., DEC Rotterdam Holland.
1376.2fixed!UFHIS::BFALKENSTEINMon Aug 30 1993 14:1612
    
    Thanks a lot for your help, Kees. Seems that this is a very special
    revision my dad has to deal with. I phoned Atari Germany, and
    fortunately they were able to send me the right schematics (in fact
    they were very polite and helpful, looked like they were happy to help
    out the last interested ;-) Atari user in Germany).
    So the machine is fixed now (two diodes and transistors were dead also)
    and full color is available again.
    
    Bernd