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IBM 5160 Mainboard (256-640KB) dead

M

mgutzeit

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Joined
Aug 5, 2017
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Location
Mainz, Germany
Hi @ All.... I have a 5160 Mainboard which i try to repair. I already changed 2 Tantalum's (c56 and C54)... But what do i have to insert in C55 ?.
On the Board are several 47u MC2 (this is what i can read on it)... Is this the correct description ? Can't find details on the net for the "C55" position on the Board

IBM 5160 C55 C56.JPG
IBM 5160 C55 C56 C54.JPG
IBM 5160 capacitor 47.JPG

Thanks for any advice

Greetings... Markus
 
IMHO it is a 47 nanoF capacitor. Next find out if it is connected to 5 Volt and to ground. If that is the case it can be replaced by anything in the range from 47 to 220 nF. If it isn't, you have to find a 47nF one.
 
Thanks a lot for the fast reply.... I can find different 47nf in the net... Any concerns about voltage ? there are 50V, 100V etc...
 
Quick google indicates to me it's 10uF Tantalum, I'd recommend using a 25V part. (Original would be 16V).
The system will also run fine without it.
 
Hi... This i have used for C54 and C56 (16V 10uF Tantal) but i asked for the Voltage of C55 - 47nF capacitor... Since i can apply (beginner like) some items on a board - I do not really understand what i'm doing... But change like for like i can manage :) ...
 
mgutzeit said:
Can't find details on the net for the "C55" position on the Board
Click to expand...
Some information is in IBM's technical reference for the 5160.
So, 47 nF as Rudd wrote. It sits on a 12V line, so you need a 47 nF rated at 12V or above.


temp_7634kkmvk93489.png
 
BTW. The "PF" that IBM has against C55 in the circuit diagram is wrong. Confirming that, on my IBM 5160, C55 has "473" printed on it. To quote one web site, "So it's 47,000pF, or 47nF, or 0.047uF."
 
Weird, the schematic says 0.047PF which cannot be anything but an error. 47 nF = 0,047 uF.
 
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