Re: HP-97 Printer Troubleshooting Message #4 Posted by aj04062 on 15 Oct 2013, 9:05 p.m., in response to message #3 by aj04062
Okay bear with this dumb M.E. question.
I've pulled the transistor and checked with my PEAK DCA55 component analyser (yes it's a British one).
NPN Silicon Transistor
Current Gain Hfe=69
Test current Ic=2.5mA
Base-Emitter V Vbe=0.72V
Test Current Ib=4.68mA
Leakage current Ic=0.00mA
This checks out okay, correct? I don't know what specs to compare these values against. This transistor is part of the "protection circuit" as outlined on the HPCC circuit diagrams, correct?
Edited: 15 Oct 2013, 9:05 p.m.
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