HP25C repair, help needed
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01-16-2019, 11:49 AM
Post: #6
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RE: HP25C repair, help needed
(01-15-2019 09:53 PM)albertofenini Wrote: One last thing, Not sure about transistors, if they have the same markings, maybe they are the same. The link I presented earlier has transistor equivalents hand drawn in on the circuit. Capacitor changes probably due to circuit modifications between early and later models. If the transistors are hot, then the power supply may not be oscillating properly and the transistors are probably passing high current through the toroid coil. If the capacitors are hot, they are probably short circuit, so a good idea to replace them before too much more use. Check any diodes as well. The big danger is that the malfunctioning power supply might be delivering too high a voltage to the rest of the circuit. cheers Tony |
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