FB-220 FILTER CAPACITOR BLOCK INSTALLATION INSTRUCTIONS PART S SUPPLIED WITH T HIS KIT : (1) FB -220 Filter Capacitor Block Assem bly To start the installation, read these instructions very carefully. Now unplug the am plifier and remove any input, output and control cables that may be connected to the back of the amplifier. Place the amplifier on a book, front panel up, and remove the bottom screws holding the feet and case in place. Lift the case up and remove it from the amplifier. Place the amplifier on the bench with the front panel facing you. You are now ready to proceed with the installation. () Remove the 15 sheet metal screws that hold the perforated cover in place and remove this along with the top rear plate cover. Remove the top rear 6-32 screw, nut and washer holding the right side panel in place along with the 4 sheet metal screws that attach the right side panel to the chassis. Remove the top front Phillips-head sc rew on t he rig ht s ide of the front panel. release the right side panel for rem oval. Tip the amplifier onto its left side. Unsolder the 3 wires attached to the old capacitor bank. There is a BLACK wire from the rectifier board, a BLUE wire also from the rectifier board and a RED & YELLOW wire from the HV transform er. Remove the (4) 6-32 nuts and washers securing the capac itor bank bracket. Now lift the bracket up about ½". Remove the 8 capacitors and the nylon spacers. This task can be made easier by cutting som e of the wires between the capacitors (they are no longer needed). Slip the replacement capacitor bank into the cavity vacated by the old capacitor bank with the solder lugs toward the front panel. Make sure that you fully slide the block to the rear of the cavity. Now, slide the assembly approximately 1/16" out of the cavity. Press down on the capacitor bank bracket and reinstall the (4) 6-32 nuts and washers. Depending on the tolerances of the bracket, you may have to leave off the washers. Tighten the nuts s ecurely. Solder the 3 wires you removed earlier; The BLUE to the bottom solder lug, the RED & YELLOW to the middle lug and the BLACK to the top lug. Place the right side panel in position and secure with the 4 sheet metal screws removed earlier. Reinstall the top front Phillips-head screw on the right side of the front panel and tighten. Reinstall the 6-32 s crew, nut and washer in the top rear of the back panel. This will () () () () () () () () () () () () 1 () Replace the perforated cover and top rear plate cover. Reinstall the 15 sheet metal screws holding these pieces in place. DO NOT over tighten these screws, as it is fairly easy to strip the screw threads in the aluminum underneath. Use the book to hold the am plifier while you reinstall the case and feet. () This completes the installation of the FB-220 filter capacitor block. It will provide you with a better power supply that provides the necessary B+ filtering and regulation. Your am plifier should not experience any filtering problems in the future. HARBACH ELECTRONICS Jeff Weinberg ­ W8CQ 468 County Road 620 Polk, OH 44866-9711 (419) 945-2359 http://www.harbachelectronics.com info@harbachelectronics.com 2 ...