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Maker Pro

I need help using a HP 1615A logic analyzer

I bought this used on eBay. I have bought a manual and logic clips for
it. I have tried to use it, but the Trace mode never recognizes the
'search word' I have set. I am wondering if I am doing something wrong
or if it is actually defective. I have set the probe threshold levels
to variable and have the trigger voltage at 3.9 volts on a 5 volt
board. I never get a trigger, even though the logic probe shows my
test points to be pulsing. I get a warning that I have no trigger.
Can someone give me some pointers on this piece of equipment, please?
 
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