ENSONIQ DP/4 Serial No. DP-15079 - action 3 (Dec 4, 2010)
Channel: krunkwerke
Date: 06/02/2011

Installment 4 of a 12 video series: http://www.youtube.com/view_play_list?p=A7DF8E8644D2617D

December 4, 2010 - ENSONIQ DP/4 Serial No. DP-15079 is experiencing problems with one of its effects units. This video documents the third set of tests performed on the system, in order to locate the root cause of the fault.

In this third set of tests, an oscilloscope is connected to the latch IC to observe the Latch Enable (LE), Output Enable (OE), latch 4 data (D4) and latch 4 output (Q4) signals.

Please note: in this particular video, the test-clip connections are incorrect. Corrections are detailed throughout, but the overall concept — which is to use an oscilloscope to observe whether there are any obvious issues with the latch circuit — remains correct.

See the photos, for this repair, here:
http://www.flickr.com/photos/krunkwerke/sets/72157626201669342/

Learn more about the details of this system, in its system log: http://zope.hardwerke.ca/projects/resources/electronic-music/manufacturers/ensoniq/dp-4/systems/dp-15079