HP-20 Question

[Alan W. Fremmer]

Dear Heath Experts,
 
Recently picked up an HP-20 on eBay.  Plugged it in and almost  immediately 
blew a fuse.  Opened it up and found the charred remnants of  something, not 
sure if it's a diode or a resistor, connected to the middle lug  of a three lug 
tie point located near the large black electrolytics.  Also  connected to that 
lug is a smaller electrolytic and a diode that goes from there  to a lug on 
the right, when viewed with the power cord facing you.
 
Not sure if that's the cause or just a symptom of bigger problems but if  
someone can identify what's blown, where the other end connects and where I can  
find a replacement I would be very grateful.
 
Thanks in advance to a great bunch of people who are always so  helpful.
 
73, Alan - KB2HEI



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