PM-200 POWER SUPPLY MODULE INSTALLATION INSTRUCTIONS PART S SUPPLIED WITH T HIS KIT : (1) PM-200 P ower Supply Module Circuit Board (1) 15K ½W 1% Resistor To start the installation, read these instructions very carefully. Unplug the amplifier and remove any input, output and control cables that may be connected to the back of the am plifier. Remove the chassis from the case and remove the perforated sheet m etal RF shield from the top of the chassis. Remove the tubes and place them in a safe place. You are now ready to proceed with the installation. () Place the am plifier on its side (transformer down). Unsolder all wires connected to the power supply circuit board. These are the RED and RED & YELLOW transform er wires on the top side of the circuit board, a GRAY wire and a YELLOW wire from the top side of the board (these wires pass through the hole in the circuit board), the (3) 4.7M resistor assembly on the bottom of the circuit board and the heavy BLUE HV w ire on the bottom side of the board. Remove the fixed end of the (3) 4.7 M resistor assembly from the terminal strip lug and discard these resistors. Remove the (9) 6-32 x 3/8" screws, w ashers and nuts that secure the circuit board in place. Save this hardware. Place the amplifier right side up and remove the 5 control knobs from their shafts. Remove the 3 nuts and washers that secure the bandswitch, meter switch and sensitivity potentiometer and save them. Remove the (4) 6-32 x 3/8" Phillips-head screws, washers and nuts that secure the front panel. Save this hardware. Gently tilt the fron t pa nel forward. You may have to carefully pry it loose with a sm all screwdriver because of paint stickage. Place the front panel down in front of the chassis. Lift the circuit board from the front so that it tilts upward about 1". Using diagonal cutters, cut the old circuit board from the front left corner all the way back to the wire hole. This will break out a path for the wires to exit. Be careful not to cut any wires during this process. This will free the old circuit board so that is can be removed without further unsoldering of wires. Carefully work the old circuit board out of the c ompartment and discard it. Take the n ew circuit board and work it into position with the wires passing through the slot in the board. Secure the board on the right side with 2 or 3 of the 6-32 x 3/8" screws, washers and nuts. Tighten enough to hold the board. They will be adjusted later. 1 () () () () () () () () () () () () Rein sta ll the YELLOW and GRAY wires in their marked holes in the circuit board and solder. Swing the front panel back into position and reinstall the (4) 6-32 x 3/8" Phillips-head screws, washers and nuts. Reinstall the 3 control flat washers and nuts and tighten. W ith the amplifier on its side (transformer down), install the remaining 6-32 x 3/8" screws, wa she rs and nuts holding the circuit board in place. Tighten all screws. You will have one screw left over. Put the RED and RED & YELLOW transformer wires through their appropriate holes in the circuit board and s older. Place the amplifier upside down. Locate the 2-lug term inal s trip just to the rear of the new circuit board. Remove the 15K resistor and clean the holes in the terminal strip lugs. Note: There is still a blue wire connected to the insulated terminal lug. Connect the sm all BLUE wire connected to hole A on the circuit board to the insulated lug of the term inal strip. DO NOT solder yet. Connect the supplied 15K ½W 1% resistor between the 2 lugs of the terminal strip. Solder all connections (See pictorial). Solder the heavy BLUE HV wire to the circle pad marked "H" on the circuit board. Carefully inspect all work. Replace the front panel knobs (m ake sure they are properly aligned with the front panel m arkings). If you are also installing the S S-200 "S oft Start" module, you can proceed to those instructions. If not, continue with these instructions. Rein stall the tubes and the perforated sheet metal RF shield on the top of the chas sis and put the chassis back into the case. () () () () () () () () () () () () This c om pletes the installation of the PM-200 pow er supply module. It will provide you with a better power supply that provides the necessary B+ filtering and regulation. Your am plifier should not experience any power supply 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 PM-200 POWER SUPPLY MODULE PARTS LIST D1 ­ D8 C1 ­ C6 R1 ­ R6 R7 R8 R9 R10 R11 ­ R24 1N5408 (3A 1000 PIV) 140µF 450VDC 2-82k 3W IN PARALLEL 910 2W 5% 3.6K ¼W 1% 1 3W 1% 15K ½W 1% 1M ¼W 1% IN SERIES 3 SB-200 POWER MODULE AND SOFT-START UNDER-CHASSIS WIRING AND PLACEMENT 4 ...