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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. Crystal Adjustment The adjustment start pressing the Volume + or ­ of remote control and the setting will be made automatically. (Warning: PAL signal is mandatory). AGC tuner setting Applying a signal of 1mV to the aerial input (UHF channel), adjust so as to give 4 VDC at pin 1 of the tuner. Screen grid voltage (Vg2) Adjust the potentiometer G2 on the transformer EHT until the confirmation message appears. No particular signal set-up is required. Vertical geometry The VS (Vertical Slope) function must be adjusted in such a way that the central horizontal line in the test signal is exactly on the border between the visible image and the lower black part. It must not subsequently be altered. Now set the remaining parameters as accurately as possible in the sequence in which they appear. Horizontal geometry Adjust as accurately as possible in the sequence in which they appear. Adjusting white (Red/Green) Using a B/W bar signal, adjust to obtain a grey image. The blue setting is fixed. Exiting service mode Once you have made the necessary adjustments, press the OK key on the remote control in one of the menus in which it is active to store all the functions and return to normal operation of the appliance. Procedura servizio Chassis Professional 8500 Alimentatore Regolare con PP2 il valore di +VB ai capi di CP31 (i valori per i diversi tipi di cinescopio sono indicati nella tabella riportata sullo schema elettrico). Attivazione modo servizio 1. Accendendere l'apparecchio con l'inter