Studer d 424 service manual

Page 2

Service Note D424 2001-01 22.10.2001 KS D424 Revision History Page 3 of 4 Analog Input/Output 1.866.140 Index 20 Rev A 22.3.2001protection of AD Converter CS-5390 in power-up phase : - with additional zener diodes D10/11 (5.6V) in parallel to C89/C94 on soldering side Add diodes on soldering side Keyboard 1.866.160 Index 00 8.6.1998improved crosstalk immunity for reliable IC2 function (Key/Display I/O) with additional C13 (47pF) between IC1.20-21 Add capacitor C13 on soldering side Clock I/O Board 1.866.170 Index 00 29.7.1996Correct Termination Switch position (modified in series production) : print modification (wires) to reverse termination switch position, for matching with backpanel label new layout 12, fixes above bug Headphone Connector 23.8.1996 additional 1000p capacitor for improved noise figures.