Re: Q1 Motor Diode Chips


Hi KJ,


What caused it? A short on one of the motor leads, now fixed that I missed seeing.


I am looking at some possible replacements for the chip as I believe it is a motor control with 3 diodes inside.


I do have a few Q1a / Revolution A and U’s as well as some Titans, just hate to lose what was still a good decoder for sound and basic light functions.


Thanks for the reply,



From: <> On Behalf Of kjlovesya via
Sent: Wednesday, January 6, 2021 8:51 AM
Subject: Re: [QSIndustries] Q1 Motor Diode Chips


Hi Frank,

  Unfortunately, obsolescence is a thing.   I know that's why QSI went to the Titan design instead of continuing the Q1a / Revolution decoder.  I don't know if components of that era are still available.  Fact is, most technology is obsolete after 10 years.  Unless the component requires some kind of programming, you might try an electronics surplus store.

   What caused the malfunction in the first place? e.g. short in the motor, weak field magnets (increases current draw), etc.  

   Personally, if you like the locomotive, I feel it's worth the investment in the Titan - U.   There are so many improvements in the Titan I cannot list them here.   There is just so much more operation and sound realism.

Best regards,



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