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Vintage Synth Repair

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Re: [vintagesynthrepair] Strange TR-808 reset problem

2013-10-28 by kslinkard@...

First thing I would look at is how clean and accurate the power supply voltages are. 

----- Original Message -----
From: "cxacxu" <cxacxu@...> 
To: vintagesynthrepair@yahoogroups.com 
Sent: Sunday, October 27, 2013 10:07:39 PM 
Subject: [vintagesynthrepair] Strange TR-808 reset problem 







Got a strange problem with an 808 here, the CPU will only start up when the +15v rail is disconnected. When +15v is connected the CPU does not start and the first light of step 1 does not light, the 5V and +/-15V rails are all steady, When the +15V is disconnected the cpu will start up and the sequencer will run. Any thoughts? 


L

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