Doorbell button diode Question. I want to replace our current doorbell button with a different one. The door bell is 7 years old and plays the Westminster chimes. The door bell button was a decorative one I bought separately and it did not come with the transformer kit. The door bell has two locations. The second plays just the first four notes. ![]() Back to CD Repair FAQ Table of Contents. CD Digital Audio Technology General Introduction to CD Technology Information on a compact disc is encoded in minute 'pits. Note: Some T-Types will have been fitted in the past with a diode across the coil. Whilst this has proved to be an effective solution to reducing the voltage across. ![]() The DC-80 A Direct Conversion Receiver for 80 Meters with "subharmonic" VFO in the "Polyakov" style July 15, 2009 by Rick Andersen, KE3IJ Technical Note 010: Lessons Learned, Why are Fuses and Solenoid Disconnects So Important? No the diode is to prevent arcing across the switch when you let your finger off the button when the magnetic field around the chime striker coil collapses. I just want to the replace the main one. I took a look at the main current button and it has a diode attached. My new button does not have a diode and the installation video does not show installation of a diode. Can I use my current button's diode and add it to the new button? I assume the current button has a diode so that the transformer will finish the medley after the button is no longer pushed. Also, the hole in the hardi plank for the existing button is larger than the new decorative button. Any suggestions for a back plate to cover the gap and allow a hard surface to secure the new button? I could patch the area but do not think it will look as if it was never patched and will show. Thanks in advance! PINBALL Repair EM Electro Mechanical Arcade Games (pinball, pitch and bat, bowlers), part two. Before Turning the Game On: Check the Fuses and Fuse Holder. Seems like such a simple thing, yet many of us forget to do it. Not only look for. For example, is there a 2. There may be more (depending on. Often there are fuses located else where too, like on the. There's usually a fuse for the. AC to DC power conversion for pop bumpers. A perfectly. good looking fuse could be open, it happens all the time. Fuses can. go open because of age (fatigue) too, and not just from shorts or. Use a Digital Multi- Meter (DMM) to test fuses. Don't try. and test the fuse installed! When removing the fuse you're testing. No buzz means fuse is bad. If the meter doesn't have a continuity function, just use. A good fuse will measure zero ohms. Symptoms include missing all lights. This is very common on Bally games. Often. the fuse holder's tabs can be bent for a better connection, though sometimes the tabs. Keep a stock of new fuse holders around and replace when needed. These can be so dirty, the fuse won't. Dirty fuse holders can also cause resistance. It amazes me what you will find inside an old game. Sometimes. bulbs short (rare, but it happens). More often it's a playfield. It powers all the coils and the score motor. Or on games. with AC to DC power conversion for the pop bumpers, the bridge rectifier. Otherwise you might as well buy. Or a wire. for the GI (general illumination) is touching the metal frame. This will of course blow a fuse, and these problems. This is common on lamp sockets on the. Also if you. took all the parts off the top of the playfield to clean it. Take a blown. glass fuse, and solder the small circuit breaker to the ends of the fuse. If there is a short, the breaker will 'blow' and can be. If the fuse stops blowing with all. Replace the. bulbs one at a time with the game turned on to find the culprit (or just. Sometimes flashing #4. That is. I cut the GI wires as they enter the playfield (in the case of a playfield. GI circuit. at the first set of sockets at the . If the fuse does not blow, I add 1. Keep doing this until the short is found. Also on pinball games. EOS (End of Stroke) switch is not adjusted correctly, this can. See the. flipper coil explanation section above. EOS switch work. together (but basically the flipper EOS switch should open when. Check the playfield switches and make sure none are stuck closed. You can. use a DMM and measure the resistance of any suspect coils (see. Most often bell, chime, knocker, flipper and 0. I have a table of common. Just put your DMM. DMM leads on the lugs of a coil. This. will give you the resistance. Three lug coils are a bit more involved. But usually the middle. Also the coin door lockout coil. Starting in 1. 97. Williams changed their pop. DC voltage. Please see. When things go wrong for more. Before Turning the Game On: Plug Connectors Cleaning & Dim/Bad Lamp Sockets. Before plugging the connector in, take your 4. This is. the area that the female plug bites in to. Wrap your sand paper around. They don't have to shine like a new. Wire brushes are available for about. Home Depot in the welding department (get the stainless steel variety. Examine the Male Connector. Often the insulation on the wires going to the male connector. This can cause the bare wire to. If this happens. a blown fuse is the likely result (in addition to some function. To fix this, the. Also check for broken wires on the male plug. If this happens, there isn't. Super Glue and some scrape pieces of. Bottom line, just don't break them! For some reason. Bally decided to make their own connectors, instead of buying them. Hence Bally connectors are. This causes particular problems, as. The male portion of the Bally connector is fine. For this reason, I don't suggest. Since these connectors are not available new. Gottlieb or Williams parts game can be used as a donor. Bally part replaced. This brings 6 volts from the transformer to the. Bally EMs that have the fuses mounted under the left. This connector (as used on Captain Fantastic, 1. GI (general illumination) for the. There isn't much you can do. This connector is pretty useless. So going around the connector to remove the burnt GI connector pin is. OK idea. Gottlieb coin door. If this connector is not making. Lamp sockets are made of metal and. They are pressed together to form an air. But as time marches on, the fiber. Corrosion. comes, and the socket becomes intermittent or doesn't work. Often playfield lamp sockets can be repaired, but really the. Backbox sockets. (the lamps behind the score glass) can almost never be repaired. I rarely find this to be a problem. The bigger problem. I just don't think. But in DC4's defense. Get some 2. 20 grit sand paper. I. rarely use it, it is helpful.) First I want to solder the round. These are usually. Sand the sides of these parts and solder them together so they are. If they don't solder easily after sanding, use a touch of. Then I move the . Now the socket has. Nearly all the other EM game. Before Turning the Game On: Check Coin Door Switches. On most EM games, if the coin door switches used to start the game when a coin is. This means some big sausage fingered owner. This way you. don't have to deal with coin door switches. Check the coin door switches. Free Play, and play some. RESIST THIS TEMPTATION. Jammed coins, bent coin switches. It's. just not worth it. Put the game on free play and forget about dropping. Trust me - your emotions will be much better. This often means. Before Turning the Game On: Stepper Units. The Biggest Problem in EM Games. Steppers. have at least one coil that . Often these stepper. If a stepper unit does not operate freely, the GAME WILL. NEVER WORK. The step up/reset units are often. This is probably. Note Williams sometimes combined a single step. For it to find its . The continuous. stepper is often used for changing features of the game and for. On woodrails often the 1. If you have a 1. 95. EM game, they are used for the lightbox scoring. There's a stepper. Often the grease used. Also the brass rivets and fingers that glide. Years and years of. There's a coil to step up the unit, andanother coil to reset the unit. Note the 4th player switch is MIS- ADJUSTED in thispicture. This is one of the most common problems seen on Bally Coin units. Common problems associated with. Game cannot be started. These wiper fingers. The wiper fingers move across a series of brass. These rivets or circuit board. A phillips and flat head. Isopropyl Alcohol (or for really seized. Brake Part Cleaner), some 4. M green pad), paper towels, and some Teflon Gel Lube. Do NOT use steel wool for. EM game, especially a stepper unit! This is only necessary. Use a ? Well mark a finger and it's rivet position. Best to do. this now, before taking anything apart. With the stepper. If they do not, the stationary. If the. fingers are *between* two rivets, you need to figure out. Note on. some units (like the Gottlieb Player Unit) this step may not. This assumes that the unit is not. On a Bally. stepper, this means removing a phillips head screw, and then pulling. You will have to hold the. On a Williams stepper, there is a 7/1. To remove this nut, on the opposite. On some steppers you may have to. Remove the SPRING that winds the unit. This is sometimes. When. releasing the spring, COUNT the spring windings as the spring. Write the number of spring turns on the stepper unit. Sharpie pen (usually this is three or four). Now the shaft/cog will pull out from the cog side. Sometimes a switch stack will. Clean everything with Alcohol, and. M green pad. Alternatively. Using Alcohol and a Q- Tip, clean the Stepper Unit's hole that the shaft/cog. After the shaft/cog and hole is clean, put a thin layer of Teflon Lube Gel. Install the shaft into the Stepper Unit. If a switch was swung. Now try spinning the cog on the other cog side of the stepper. Wind the clock spring back to the number of turns you documented. If any other springs were removed, re- attach those too. First use a rag and some. Then use 4. 00 or 6.
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