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Manual abstract: user guide HARBACH ELECTRONICS FM-222
Detailed instructions for use are in the User's Guide.
[. . . ] FM-222 FAN & MOTOR REPLACEMENT INSTRUCTIONS
PARTS SUPPLIED WITH THIS KIT: (1) Fan Motor with Leads (1) 6" 6-Bladed Fan (2) Fender Washers (2) 8-32 x 2 Screw (4) 8-32 Nuts (2) 8-32 X 1/4 Aluminum Spacer (2) #8 Lock Washers (2) Blue Wire Nuts
FM-222 FAN MOTOR PREPARATION INSTRUCTIONS
() One at a time, remove black hex head screws holding the two rotor halves together and replace each with one #8-32 x 2" screw. Be sure to reverse the orientation of the screw so that the threaded end of the screw sticks out the back side of the frame (opposite direction of the motor shaft). On each end of the screws you just installed, place a #8 lock washer and a #8-32 x 1/4" aluminum spacer and tighten spacer on each side. [. . . ] If you have not unpacked the motor and fan blade, do so now. Using one of the larger foam pieces as a cushion, place the motor (shaft up) on the foam pad and press the mounting studs into the foam. Take the fan blade (metal ring up) and press the blade down onto the shaft. Have about ¼" of the shaft protruding through the fan blade hub. Remove the outer nut and washer from each of the mounting studs of the new motor. Locate the 2 wires coming from the old fan motor and cut them where they go through the chassis. 1
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Turn the amplifier back right side up. Remove the screws (or nuts, whichever you have) holding the old fan motor to the rear panel. Lift the old motor and fan out of the chassis through the area vacated by the tubes. Lower the new motor and fan into the area vacated by the old fan and motor. Push the mounting studs through the existing mounting holes and secure with the provided washer and nut on each stud. Pull the motor leads out of the bottom of the fan cutout. Cut both wires so that about 2" extend outside the fan cutout with the leads dressed against the rear panel and pulled toward the circuit breakers. Strip approximately ½" of insulation from the motor leads. [. . . ] Reinstall the case and feet using a book to support the amplifier.
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This completes the replacement of the fan motor on your SB-220. You will notice a big difference in fan noise. The new fan and motor assembly is much quieter than your old motor and moves more 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
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