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Upon further inspection of the characteristics of the RL401 and RL402 relays, here are my findings.
If I am reading these diagrams correctly, the switch shown in the relay should be normal state (or resting). When operating the unit, I observe the following behavior:
1. Power On
RL402 is activated.
RL401 is not activated.
2. Press Play
RL402 is active.
RL401 is activated.
By looking at the schematic, RL402 is circled in yellow. Being activated places it in the (PLAY) position. Which should be the correct behavior.
RL401 is circled in green. When this relay is activated, it is in the (REC)ing position. My understanding of the circuit is that RL401 should remain unactivated when I press play to remain in the (PLAY) position. When RL401 is in the (REC)ing mode, following the circuit shows that it is grounding the playback audio coming out of the audio head.
Somehow, somewhere, the audio portion of the recording circuitry is getting activated. Does my diagnosis seem logical?
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