[pvision]

I have an M186 Digital Time Delay with no delay output. The M186 (also sold as an M175 with a different maximum delay time) is a fairly rare 1U rackmount DDL similar to a Lexicon PCM42, etc

The unit passes audio. There is a dry / wet mix pot where dry audio passes OK but there is no wet audio to the pot

The unit uses 74-series delay chips, an NE571 compander and an NTE4016B which I believe is used for the bypass switch.

I can't yet verify if there is audio in the delay line and diagnostics would be much easier with a schematic

Nick Froome

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