[time-nuts] HP 106B part no.

[Mark Kahrs]

1854-0003:

Material: Silicon
NPN
Pw = 800 mW
Ft = 50 MHz
Vceo = 28 V
Package = TO-5
Hfe = 60/240 10 mA

No JEDEC part number.

On Sun, Aug 9, 2009 at 1:02 PM, Glenn Little
WB4UIV<glennmaillist at bellsouth.net> wrote:
> 1854-0003 is a good part number. I have a few here that were removed from
> equipment.
> Possibly someone with the proper equipment could characterize this part and
> determine a suitable parametric substitute.
>
> 73
> Glenn
> WB4UIV
>
> At 11:43 AM 8/9/2009, you wrote:
>>
>> Double check: "Q11 is marked as 1854-0003."  I can't find it in any of the
>> HP cross references.
>>
>> Brian - KD4FM
>>
>>
>> Jim Palfreyman wrote:
>>>
>>> Hi all,
>>>
>>> Latest update.
>>>
>>> With some help and phone calls from Bill the fault seems to have been
>>> isolated. I have removed Q11 from inside the oven and it is cactus. Q9
>>> is also very suspect so I'm going to replace that for good measure.
>>>
>>> Q9 is a 2N1701 in a T08 package. Thanks to various people I should be
>>> able to track one down. Q11 is marked as 1854-0003 and that's an HP
>>> internal number and all I know. Might have to substitute that one.
>>>
>>> After all this I have some quality photos and can knock up some good
>>> descriptions of the repairs and the 106B internals if anyone is
>>> interested. Any websites hanging around that want to take what I have?
>>>
>>> Regards and thanks to all!
>>>
>>> Jim Palfreyman
>>>
>>>
>>> 2009/8/9 Adrian <rfnuts at arcor.de>:
>>>
>>>> Re-read Jim's posts.
>>>>
>>>> To me it seems clear that he is talking about the 2N1701 Q3 in the upper
>>>> right corner of fig. 5-12.
>>>> He mentioned that +18 measures high, around 26V.
>>>> So, the problem is NOT in the battery charger circuit.
>>>>
>>>> The purpose of that Q3 is to generate +17.4V (and +7V) from +26V, with
>>>> the
>>>> base being connected to +18V, thus the emitter voltage of Q3 is +18V -
>>>> 0.6
>>>> to - 0.7V.
>>>>
>>>> The +18V regulator circuit is on the lower left of fig 5-8, A1A4 Outer
>>>> Oven
>>>> Controller. For a circuit description see 4-40 to 4-44.
>>>>
>>>> The +18V feed the AC amplifier (A1A2), the +15V through R14 (might be
>>>> cooked
>>>> if run at 26V for extended time) and CR2 on the same board, the power
>>>> amplifier (A1A3), the outer oven temperature control circuit (decoupled
>>>> +18V), and the inner oven control cuircuit A1A5.
>>>> The 17.4V that are derived from +18V feed the dividers.
>>>>
>>>> Any adjustments make sense only after fixing the +18V supply.
>>>>
>>>> Actually, Q3 might as well be shorted. I would first remove it from the
>>>> circuit to see if the +18V are then correct.
>>>> If not, check the voltages at Q9 and Q7 of A1A4. Q9 is mounted on the
>>>> oven
>>>> housing cover.
>>>>
>>>> Regards,
>>>> Adrian
>>>>
>>>> Bruce Griffiths schrieb:
>>>>
>>>>> christopher hoover wrote:
>>>>>
>>>>>
>>>>>>>  The 2N1701 is a general purpose transistor rated at 60V, 2.5A.
>>>>>>>
>>>>>>>
>>>>>> I've mentioned this before, but it bears repeating.
>>>>>>
>>>>>> If you are having trouble with an old school linear power supply, in
>>>>>> many cases you can replace the TO-220 PNP pass transistor *and* the
>>>>>> reguatlor circuit (based on a 723 or whatever) with a modern
>>>>>> integrated regulator in TO-220 such as an LT1581.  Strip the regular
>>>>>> board of everything except for the the input and output caps (if they
>>>>>> are still good) and wire up a pair of resistors to set the voltage.
>>>>>>  Add
>>>>>> a couple of jumpers to complete the circuit.   And then you are
>>>>>> good to go.
>>>>>>
>>>>>> -ch
>>>>>>
>>>>>>
>>>>>>
>>>>> That probably wont work in this case.
>>>>> The supply is actually an NPN discrete darlington buffered 32V zener
>>>>> with a current limit transistor to set the battery charging current to
>>>>> one of 2 values.
>>>>> With the battery removed the supply output should rise to 32V - 2Vbe -
>>>>> a
>>>>> diode drop, ie about 29.8V or so.
>>>>> The series diode is required to isolate the battery from the regulator
>>>>> output when the main fails.
>>>>> It should be much quicker and easier to just find suitable transistors.
>>>>>
>>>>> Bruce
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> time-nuts mailing list -- time-nuts at febo.com
>>>>> To unsubscribe, go to
>>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>>> and follow the instructions there.
>>>>>
>>>>>
>>>>>
>>>> _______________________________________________
>>>> time-nuts mailing list -- time-nuts at febo.com
>>>> To unsubscribe, go to
>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>>> and follow the instructions there.
>>>>
>>>>
>>>
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>>
>>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>