Studer d 424 service manual
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Page 1
Service Note D424 2001-01 22.10.2001 KS D424 Revision History Page 2 of 4 SCSI Board 1.866.130 Index 20 shipped with prototype and promotion series only (S/N 00xx, 01xx) subsequent modifications : wire bridge, see drawing below Index 21 5.9.1996 shipped with prototype and promotion series only (S/N 00xx, 01xx) sample accurate timecode sync : - wire bridge P201.23C to RZ301.3 21.9.1996new layout Index 12without above wire bridges Index 22 5.2.1997SW Upgrade V1.1 : (factory upgrade required for SW 1.866.903.21) Main Software IC105/104: 1.866.900/901.20 -> 21 Index 23 30.6.1997SW Upgrade V1.2 : Main Software IC105/104: 1.866.900/901.21 -> 22 Index 24 30.10.1997SW Upgrade V1.3 : Main Software IC105/104: 1.866.900/901.22 -> 23 Frontpanel SW ICxx: 1.866.902.20 -> 21 decoupled SCSI Termination Power - additional diode D501: BAV20 in series with R502 correct termination of IRTS3 processor port new R232 (2k7) at P201.30B to 32C Index 25 14.4.1998SW Upgrade V1.3.1 : Main Software IC105/104: 1.866.900/901.23 -> 24 Index 26 13.8.2001SW Upgrade V1.6 : Main Software IC105/104: 1.866.900/901.24 -> 25 lower temperature operation of Altera circuits for extended lifetime - IC 601/701 with mounted heat sink (50.20.3013) Index 20 modification (for boards with layout 11 only) : - cut track between IC 404 pin 1 and nearby contact hole - solder wire to IC404.1, feed it through contact hole, and connect it to IC 204.3 on soldering side Index 21 modification (for boards with layout 11 only) : - add wire bridge P201.23C to RZ301.3 Index 24 : Diode D501 Index 24 : R232 SCSI Board 1.866.130.24 Index 26: Heatsink for IC 601/701, mounted with thermally conductive adhesive (99.01.3252) IC 701 : min distance to bottom edge : 29 mm
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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.