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QSI Quantum DCC Decoder
Bob has a question for knowledgeable readers:
“I have two HO Walthers(920-40991) Proto 2000 E7 Locomotive with QSI Quantum DCC Q1a Sound Decoder. All works except sound. Unplug sound and plug in new speaker and we get sound. Loco works for 5 second then off for 5 second then on again. Off and on again every 5 second. I replug in the original two speaker, loco runs great, but no sound. Any ideas will help.”
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check the resistance of the speakers original may be a 4 ohm speaker and your connecting and 8 ohm speaker