Re: Printing quality on HP-97 - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: Re: Printing quality on HP-97 (/thread-177543.html) |
Re: Printing quality on HP-97 - Christophe Dubreuil - 01-24-2011 Here is the scan , but in reality the difference is more importnat than on the scan :
Thanks
Christophe Dubreuil
Re: Printing quality on HP-97 - Ignazio Cara (Italy) - 01-25-2011 Hi Christophe, Regards
Ignazio
Re: Printing quality on HP-97 - Christophe Dubreuil - 01-25-2011 It is the same paper ... I havent touched the printer part of th HP-97 (or unwillingly). Regards
Christophe
Re: Printing quality on HP-97 - Katie Wasserman - 01-25-2011
Quote: I don't know why this changed but there's and easy and documented fix for this in the service manual.
Quote: There's no way to tell what the current value of R8 is without looking. Each HP-97 was shipped from the factory with a selected value, they list values from 34.8K to 196K in the service manual, but they've all 1% resistors.
-Katie
Re: Printing quality on HP-97 - Christophe Dubreuil - 01-31-2011 I finally went thru the service manual ... i checked the various things i could (resistances and voltages) and all seems OK , i guess it may be one of the transistors that is weak (explaining meybe the light line). I should get an oscilloscope ro further investigate. But as i pointed out ... it happened after i opened it for fixing the magnetic card reader ... it was perfectly working before ...i should have inadvertably modified something. I am a bit reluctant to change R8 and modify it. I guess i will use it as it is, and if it get worst i then will proceed further. Thanks to the community.
Christophe Dubreuil
Re: Printing quality on HP-97 - Ignazio Cara (Italy) - 01-31-2011 Hello Christophe, Regards
Ignazio
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