SS-221 "SOFT START" INSTALLATION INSTRUCTIONS PART S SUPPLIED WITH T HIS KIT : (1) SS-221 "S oft Start" Circuit Board Assembly (1) Full-W ave Bridge Rectifier (1A 400 PIV) (1) #8 Bent Solder Lug (2) 200V ZNR Transient Suppressors (1) 390V ZNR Transient Suppressor (2) 1N4005 Diodes (1A 600 PIV) To start the installation, read these instructions very carefully. Now unplug the amplifier and remove any input, output and control cables that may be connected to the back of the am plifier. Place the amplifier on a book, front panel up, and remove the bottom screws holding th e feet and case in place. Lift the case up and remove it from the amplifier. Place the amplifier upside down on the bench with the front panel facing you. Place the SS-221 module in the open space on the chassis over the capacitor bank w ith the attached large black leads coming out toward the back of the chassis. You are now ready to proceed with the installation. () () Cut the 2 cable ties on the power lead wiring that are neares t the back panel. Locate the large black wire coming from the right hand terminal of the lower circuit breaker. Unsolder this wire and clean the hole in the term inal of the breaker. Cut ½" off of the end of this wire and strip about ¼" of insulation from the end of the wire. From the component side of the SS-221 circuit board, pass this wire through hole "C" and solder. Solder the wire coming from hole "A" in the SS-221 circuit board to the circuit breake r terminal just vacated, trimming as necessary. This is easiest to do by first tinning the end of this wire. In a like manner, remove the larg e blac k wire from the right hand terminal of the upper circuit breaker. Prepare the terminal and wire as previously described. Pass this wire through hole "D" on the SS-221 c ircuit board and solder. Solder the wire coming from hole "B" of the SS-221 circuit board to the circuit breaker terminal just vacated, trimming as necessary. This is easiest to do by first tinning the end of this wire. Locate terminal strip "BT". It has 2 resistors, a 20µF capacitor and a diode connected to it. It is located on the left side of the chassis, slightly forward of middle. Remove the diode. Remove the red transformer wire connected to the center ground lug. Clean out the ground lug and the lug that has the "+" terminal of the capacitor soldered to it. Find the small bridge rectifier supplied w ith the kit. Note that the (+) lead is slightly longer than the rest. This is the plus ("+") lead and is marked on the top of the bridge rec tifier. W ith the rectifier on the right side of the terminal strip (w ires up), put the (+) through the most forward terminal (lug) on the strip (the one with the "+" lead of the capacitor going to () () () () () () () 1 it). Put the red lead from the SS-221 module through the same terminal lug, trimming as necessary. Solder 5 wires at this lug. () Put the (-) lead of the bridge rectifier that is opposite of the (+) lead through the cente r (ground) lug of the term inal strip. Put the black lead from the SS-221 module through the same terminal lug, trimm ing as necessary. Solder 3 wires at this lug. Solder the left lead of the bridge rectifier to the terminal lug that has the red wire f rom the transform er soldered to it. Solder the loose red transformer wire (removed earlier) to the remaining lead of the bridge rectifier. Po sition the bridge rectifier so that it is clear of any wiring. It will be held in place by its leads. Locate the 8-32 screw just forward and to the left of the line voltage selector strip. This holds down one corner of the HV transformer. Remove the nut and place the #8 solder lug (supplied) over the protruding screw. Replace the nut and hand tighten. Take the 2 ZNR suppressors marked 14K20IU and put one lead of each through the new solder lug. The other end of the ZNR suppressors goes to the end terminals of the voltage selector term inal strip (NOT to the screws holding the strip dow n). Position the ZNR suppressors and the ground lug so that the ZNR leads are in the clear. Solder the 2 leads to the ground lug and trim off any excess. Now fully tighten the 8-32 screw and nut holding the ground lug and transform er. The ZNR suppressor marked 14K39IU is connected between the end terminals on the voltage selector terminal strip (the same strip where the 14K20IU suppressors are connected). Place the leads from the ZNR suppressors under the terminal screws and tighten. Dress the power leads back into the wire bundle and tie using la cing, cord, string or tiewraps. Locate the antenna changeover relay an d ide ntify the wires connected to the relay coil. There should be a red wire on the lug nearest the front panel. Solder the lead from the banded end (cathode) of one of the supplied diodes to the relay coil lug with the red wire soldered to it. Solder the lead from the unbanded end (anode) of the other diode to the opposite relay coil lug. Both free diode leads should be extending to the right, toward the output coax cable. Bend the two free diode leads so that they touch, but are clear of any other wiring. Solder these leads together. Place the SS-221 module in the c lear space in front of the input voltage selector terminal strip, relays down. W hen a good location has been found, lift the module and clean the chassis at this location with alcohol or other similar cleaning fluid. Place a small dab of s ilicon e ad hes ive on the top of each relay and place the SS-221 module back onto the chassis. Use a weight of some kind to hold the SS-221 module down. Let the silicone cure for at least 12 hours (24 hours is better) before reassembling the case to the amplifier. 2 () () () () () () () () () () () () This completes the installation of the SS-221 "So ft Sta rt" module. Before putting the case back onto the chassis, it would be w ise to check the operation. NOTE: MAKE SURE THE "SAFTY BRASS SPRING INT ERLO CK" IS NOT GROUNDED BEFORE PLUGING INTO AN AC OUTLET. FAILURE TO DO THIS WILL SHORT CIRCUIT THE HIGH VOLTAGE SUPPLY TO GROUND AND DAMMAGE WILL RESULT IF POWER IS APPLIED! To do this, right the am plifier and plug it in and place the multi-meter switch to the "HV" position. With the power selector switch in the "CW" position, turn the amplifier on. Observe the plate voltage. Afte r about one half second, it should read its normal reading. You will hardly notice any difference in the operation of your SB220, but you will know it is very well protected from voltage transients and high inrush currents. SS-221 "SOFT START" MODULE PARTS LIST BR1 D1 & D2 K1 & K2 R1 & R2 (240VAC) R1 & R2 (120 VAC) R3 Z1 & Z2 Z3 FULL-W AVE BRIDGE (1A 400 PIV) 1N4005 (1A 600 PIV) SPDT 12A 48VDC 20 10W 10 10W 3000 2W 5% 200V MOV 390V MOV HARBACH ELECTRONICS Jeff Weinberg ­ W8CQ 468 County Road 620 Polk, OH 44866-9711 (419) 945-2359 http://www.harbachelectronics.com info@harbachelectronics.com 3 ...