[time-nuts] HP 106B part no.

Glenn Little WB4UIV glennmaillist at bellsouth.net
Sun Aug 9 17:02:53 UTC 2009


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
>>>>
>>>>
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>>>>
>>>>
>>>>
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>>
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>
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