MICROELECTRONICS. 2N/91/ 2N/94/ COMPLEMENTARY SILICON POWER TRANSISTORS. 2N, 2N, 2N AND 2N ARE . Characteristics of the 2N bipolar transistor. Type – p-n-p; Collector-Emitter Voltage: 40 V; Collector-Base Voltage: 40 V; Emitter-Base Voltage: 5 V. Manufacturer Part No: 2N Order Code: Technical Datasheet: 2N Datasheet. Availability: No Longer Manufactured. See all Technical Docs.
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So the problem seems to lie on the power supply board. Will check my box of scraps. I’ll bet the B in B is an 8 and if so is a date code.
My eyes are not what they used to be. If you had a spare lying around it would be good to have one available. Hardware shot simply shows the Motorola circled red.
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Subject of the new topic: Substituting a 2NG for the B hasn’t made any difference. One of the LeCroy shots has parameters overlaid showing min and max voltages reached – as does the single Rigol shot taken simultaneously. In this case the device is connected datashedt a large pad on the Seems that’s the way it should be.
Also can anyone make use of some fast switching diodes and other parts? The soldering does not look original.
Reed Dickinson toggle quoted message. Biggest challenge is finding enough time to do the diagnostics.
I have plenty of photos and waveforms from diagnostics so far but I’m not sure how to upload them or link them to this post. I’ve been unable datasheer find any datasheet on this item and don’t know 22n5193 it’s original or a substitute from an earlier rework. There’s also one expanded timebase shot from the LeCroy showing the U op-amp output into the base of Q and its correspondence with movements on the -5V rail, which starts its downward trajectory but is derailed by the positive shift at Q base and doesn’t recover.
Search Only Within This Topic. At present, I’m just looking for advice on whether this part of the supply is particularly sensitive to the characteristics of Q, details of what the full identifier for the Motorola B might be and where I might find a datasheet, and advice as to whether the 2NG is a suitable replacement and, if not, what to use instead.
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2N Datasheet(PDF) – Savantic, Inc.
This cannot be undone. On Mon, Oct 8, at As far as I can tell U and Q are behaving as expected but I can find no bad passives on the -5V supply sub-circuit. Use a mica washer when mounting on a metal surface. Presume there’s guidance on the site somewhere – will try some more searching. I can post some annotated scans of the relevant schematic parts if that would help. Q’s Tek part number for my ‘s serial number isfor which Sphere lists 2N as a substitute. Reason Report to Moderators I think this message isn’t appropriate for our Group.
And datsheet inspection shows you’re right that it’s not B I’ll presume for now the 2N is working OK and move on. Hopefully this will help with interpretation of my earlier msg. The photo titles show the channel allocations to the rails.
Your email is included with the abuse report. I’ve started to compare how the -9V and -5V supplies are behaving as the first appears to be working fine and the second is not and they’re not very dissimilar subcircuits and use the same op-amp. I hope that will shed some more light.