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Hello.....A bit of a longshot here but I have a couple of the old 161772 modules one of which has just gone wrong. In bus stop configuration the bus pulls in and stops but is now never released. I have replaced the dual timer chip 556 and also the 2n5551 transistor at the output for the stop stelle magnet to no avail. I was wondering if anyone had a circuit diagram for this module which might help me identify the problem.....Thank you for your time....John
 
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