Should the q23 transistor In step 51K see continuity between the collector and base leads?
http://www.digikey.com/product-search/e ... =ztx553-nd
After inspecting the solder points i do not see any solder bridging the gaps, but it is toning when I check with the DMM. I suspect the transistor is defective, but before I remove it I figure I should confirm it is wrong.
I continued assembling and passed the testing in step 55 which made me consider the transistor is functioning as intended.
Q23 transistor continuity question
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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david martin
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Matt Cramer
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Re: Q23 transistor continuity question
Exactly how much resistance do you measure between these pins?
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david martin
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Re: Q23 transistor continuity question
between .6 and 1 ohm.Matt Cramer wrote:Exactly how much resistance do you measure between these pins?
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Matt Cramer
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Re: Q23 transistor continuity question
That doesn't sound right.
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david martin
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Re: Q23 transistor continuity question
It isn't causing any problems so I'm hesitant to remove it in fear of damaging the PCB.Matt Cramer wrote:That doesn't sound right.
Any idea what circuit the Q23 transistor is part off?
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DonTZ125
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Re: Q23 transistor continuity question
Q23 is part of the VR signal conditioner circuit; Pin 3 (C) is connected to ground, while Pin 2 (B) is connected to the wiper of R56. Now, if R56 is completely wound out such that the wiper is effectively grounded, then yes - you will get a ridiculously low resistance between the collector and base of Q23. This will also happen if you have a solder bridge between Pin 1 and Pin 2 (wiper) on R56.
