User Manual DDS200 Digital Demodulation System 070-9952-00

Preparation for UseInitial update - No executable firmware in the unit. If the unit does not havefirmware, remove the rear panel as described in Installing Options on page 1–16.The Main Processor board is located on the right at the bottom side (as viewedfrom the rear panel). The board can be recognized by the flat cable connectedbetween it and the rear panel. Several jumpers are provided in front of the flatcable. The one at the right is normally in position 1-2. To release an initialfirmware update, change this jumper into position 2-3 (right), and switch on theunit.If the flashup software is started on the PC, the firmware is loaded into the unit,even if the unit has no executable firmware. At the end, set the jumper toposition 1-2, and close the unit.Firmware in modules. Most modules (options) are provided with a certain amountof firmware in OTPs (similar to EPROMs but not ultraviolet erasable) that mustbe replaced only in rare cases. If, however, replacement is necessary, installationinstructions are supplied with the new OTP.Basically, an OTP is replaced on a module as follows:1. Loosen the rear panel as described in Installing Options on page 1–16, andfold it down.2. Loosen all connections between the rear panel and module concerned.3. Remove the module from the rear.4. Remove the upper cover from the module.5. Remove the OTP, using an appropriate tool. For the position of the OTP,refer to the instructions that are packaged with the OTP.6. Insert the new OTP.7. Re-assemble the parts in reverse order.8. Observe if there are any messages displayed when powering on the unit.1–14 DDS200 Digital Demodulation System User Manual