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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Transistor identification help (HP3457A)
I have a TO-92 Motorola transistor that I've been unable to identify. It
markings a ______ | 4-| | 094| |m913| ----- The m in the above pic is the Motorola logo. It's out of a HP 3457A DMM. Unfortunately, none of the service manuals that I've downloaded has the schematic or parts list of this particular revision of the circuit board. It located on the analog portion of the meter and is part of the optically coupled serial interface to the digital section. Thanks for any help! |
#2
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Transistor identification help (HP3457A)
JW wrote: I have a TO-92 Motorola transistor that I've been unable to identify. How do you know it's a transistor ? Graham |
#3
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Transistor identification help (HP3457A)
On Fri, 18 May 2007 09:48:13 GMT Eeyore
wrote in Message id: : JW wrote: I have a TO-92 Motorola transistor that I've been unable to identify. How do you know it's a transistor ? Assuming. I, of course, could be wrong... The device is shorted, so I can't test it to be sure. Of course it's the only one in the whole meter, otherwise I could have extracted another for testing. |
#4
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Transistor identification help (HP3457A)
They appear to be HP numbers.
The 4- is the end of 1854-xxxx. Don't know about the rest. I have a pdf file of cross references if you want it? email me direct. Colin "JW" wrote in message news I have a TO-92 Motorola transistor that I've been unable to identify. It markings a ______ | 4-| | 094| |m913| ----- The m in the above pic is the Motorola logo. It's out of a HP 3457A DMM. Unfortunately, none of the service manuals that I've downloaded has the schematic or parts list of this particular revision of the circuit board. It located on the analog portion of the meter and is part of the optically coupled serial interface to the digital section. Thanks for any help! |
#5
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Transistor identification help (HP3457A)
On the circuit board is there a reference designator for the part
(Q123 for example) ? On May 18, 5:21 am, JW wrote: I have a TO-92 Motorola transistor that I've been unable to identify. It markings a ______ | 4-| | 094| |m913| ----- The m in the above pic is the Motorola logo. It's out of a HP 3457A DMM. Unfortunately, none of the service manuals that I've downloaded has the schematic or parts list of this particular revision of the circuit board. It located on the analog portion of the meter and is part of the optically coupled serial interface to the digital section. Thanks for any help! |
#6
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Transistor identification help (HP3457A)
Colin Horsley wrote:
They appear to be HP numbers. The 4- is the end of 1854-xxxx. Don't know about the rest. I have a pdf file of cross references if you want it? email me direct. Colin "JW" wrote in message news I have a TO-92 Motorola transistor that I've been unable to identify. It markings a ______ | 4-| | 094| |m913| ----- The m in the above pic is the Motorola logo. It's out of a HP 3457A DMM. Unfortunately, none of the service manuals that I've downloaded has the schematic or parts list of this particular revision of the circuit board. It located on the analog portion of the meter and is part of the optically coupled serial interface to the digital section. Thanks for any help! I have a cross reference that says (if the above is true) that it is 1854-0094 = MPS3646 Don't know if this is even similar, but just thought I would throw it out there. |
#7
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Transistor identification help (HP3457A)
On Fri, 18 May 2007 12:43:41 GMT Ken wrote in
Message id: : Colin Horsley wrote: They appear to be HP numbers. The 4- is the end of 1854-xxxx. Don't know about the rest. I have a pdf file of cross references if you want it? email me direct. Colin "JW" wrote in message news I have a TO-92 Motorola transistor that I've been unable to identify. It markings a ______ | 4-| | 094| |m913| ----- The m in the above pic is the Motorola logo. It's out of a HP 3457A DMM. Unfortunately, none of the service manuals that I've downloaded has the schematic or parts list of this particular revision of the circuit board. It located on the analog portion of the meter and is part of the optically coupled serial interface to the digital section. Thanks for any help! I have a cross reference that says (if the above is true) that it is 1854-0094 = MPS3646 Don't know if this is even similar, but just thought I would throw it out there. Bingo! That was it. Meter is up and running again. Thanks everybody for all your help, and thank you Colin for those cross refs - they will prove to be quite valuable, I'm sure! |
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