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Chassis Professional 8500 service procedure
Power supply Using PP2, set the value of +VB at the terminals of CP31 (the values for different types of CRT are indicated in the table on the circuit diagram). Entering service mode 1. Power up the appliance by pressing the on-off switch simultaneously pressing and holding the MENU button of the cabinet controls until the red LED lights up. 2. Release the MENU button at the cabinet and press the stand-by button on the remote control. The appliance will start up in service mode with a specific support menu. 3. The functions can be selected using the UP/DOWN buttons of the remote control then adjusted with the Volume ± buttons. It is advisable to note down the initial value of each parameter before making any adjustment, so that it can be restored easily if necessary.
If the memory NVM (ICR3) is replaced, it is essential to carry out all the adjustments required in service mode because the replacement memory is supplied NOT preprogrammed. These operations may take some time, so you must wait until they are complete. Although the individual settings can be accessed and memorised individually and independently, it is advisable to carry them out in the sequence in which they appear when pressing the DOWN key.
Option byte The correct value for the individual appliance is indicated on the label affixed to the rear of the cabinet alongside the words Option byte. The value can be entered using the number keys on the remote control.
