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Wiltron 560A input module 560A-B-11351

M

Max65

Jan 1, 1970
0
Hi there,
I've got a a trouble repairing an input module 560A-B-11351 owned by a
friend of mine.
He gave me it with the Network Analyzer service manual, so I have the
inner block diagram of the input module, but not the electrical
diagram of it.
Since one of the two 8 pins open frame input chips is faulty (and I
don't know what it could be), does anybody know what are those chips?
My friend said me he knows that the older model 560 used 2 thermal
coupled j-fets instead of those chips, but I don't imagine how it
could be, since the chips have 8 pins and two j-fets just 6!
Any suggestions will be appreciated.
 
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