FM-202 FAN & MOTOR REPLACEMENT INSTRUCTIONS PART S SUPPLIED WITH T HIS KIT : (1) Fan Motor with Leads (1) 3½" Fan Blade (2) Blue W ire Nuts (1) Long Shank 3/32" Hex Wrench (2) 8-32 x ½" Screws (2) 3/8" Rubber Grom mets (2) #8 Shoulder W ashers To start the installation, read these instructions very carefully. You will n eed a ¼ " drill bit and a narrow screw driver at least 4" long. Unplug the amplifier and remove any input, output and control cables that may be connected to the back of the amplifier. Remove the chassis from the case. Remove the perforated sheet metal shield from the top of the chassis and remove the tubes. Place the tubes where they will not be dam aged. You are now ready to procee d with the installation. () Drill a ¼ " hole in the left side of the tube compartment 5¾" inches from the rear of the chassis and about 3/16" up from the under side of the chassis. This will be the screwdriver access hole for the fan blade setscrew. If you have not unpacked the motor and fan blade, do so now. Cut the 2 black fan power wires. Cut them near the motor winding. W ith the am plifier right side up, bend the fan blades up until you find the setscrew in the fan hub. Put your narrow screwdriver through the hole you drilled and remove the fan blade by unscrewing the setscrew. Remove the (2) 10-32 screws that attach the fan m otor to the chassis and discard them, along with any washers. Remove and discard the 2 rubber grommets that padded the motor mounting screws. Clean any debris out of thee holes. Install the new rubber grom mets in the m otor mounting holes. Pass 1 of the 8-32 x ½" screws through a shoulder washer. The shoulder of the washer should face away from the screw head. Set the new fan motor in place with its mounting holes aligned with the holes in the rubber grommets. Pass the screw through the grommet into the adapter block on the fan m otor. In a like manner, repeat for the other 8-32 x ½ " screw and shoulder washer. () () () () () () () () () () () 1 () () Tighten both sc rews firmly, but DO NOT over-compress the rubber grommets. Note that the fan blade is marked to indicate the location of the setscrew. Place the fan blade over the motor shaft with the hub and setscrew toward the chassis. Lower the fan blade until there is about ¼" clearance between the fan blade and the chassis. Now tighten the setscrew. Spin the fan blade to assure that there is clearance with the chassis and other nearby components. W ith the chassis upside down, determine where the motor leads should be cut so they can be spliced with the black power leads. Cut and strip both motor wire leads and power leads. Twist the power leads to the motor leads and secure with blue wire nuts. Reinstall the tubes and perforated top cover. Place the amplifier back into the cabinet. () () () () This c om pletes the replacement of the fan m otor on your SB-200. You will notice a big difference in fan noise. The new fan and motor assembly is much quieter than your old motor and moves m ore air for better cooling. HARBACH ELECTRONICS Jeff Weinberg ­ W8CQ 468 County Road 620 Polk, OH 44866-9711 (419) 945-2359 http://www.harbachelectronics.com info@harbachelectronics.com 2 ...