[Heath] Heathkit Schlumberger SM-118A help

[James]

Hi Group,

I have acquired a Frequency Counter and only getting 8's and 9' lit up on the display.  I am in need of a schematic for this unit if any one has a scan or Pdf copy.  I think something is wrong in the front end, as when received it showed only zeros, hooked a short antenna and keyed  near it with no results.  Next step used a frequency generator, and after no result slowly started moving forward in the circuit. Had no result of anything, then poof the display went all 8's and 9's and does not change back.
Guess I will be replacing some parts to get her going again, just not much experience with this kind of item.

Thanks in advance

James WS4JH
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