Question about Dewalt DC920KA Heavy Duty Xrp 18V Cordless Drill/Driver

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Speed control transistor

I recently burned out the speed or voltage regulator transistor. the numbers stamped on the transistor are'nt the actual part numbers. does any body know the part numbers so I can just replace the damaged part not the whole switch. Thanks.

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  • 313 Answers

If ur drill is DW988 use switch # 152274-19
if ur drill is DC925 use switch # 152274-25
see www.ereplacementparts.com for parts & diagram

Posted on Jul 26, 2008

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Speed is inconsistant, spray it with deoxit. still will not hold speed. Whats the best way for the spray to get into the pots?


It might not be anything to do with the pots. Speed problems can be caused by the circuit controlling the voltage. If there is a voltage regulator transistor or IC they can go faulty. The motor itself can also get dirt on it's contacts, or become so worn that they make erratic contact.

Feb 04, 2016 | Audio Players & Recorders

1 Answer

Onida 21''ctv picture coming in stamp type {cutting from four sides}


Hello
Replace its Horizontal output Transistor. If the base-emitter junction has a leak inside it, this type of fault will occur. Before replacing it, check the main DC voltage to LOT [Line Output Transformer]. It should come around 102VDC. If there is not this much voltage, check the electrolytic filter capacitor connected across thie supply line to main negative for open or value developed. Replace the same is good. Till there is low voltage found, check the retifier diode that rectifies this 102 volt DC. If all the above are OK and still you get a stamp like raster, check the heat of the Horizontal Output Transistor described above. if it overheats, LOT is defective and should be replaced with same type and number. OK.

Jun 12, 2011 | JVC Televison & Video

1 Answer

This is a Wagan 2003-6 400Watt with USB DC to AC Inverter. Worked great for almost a year. Recently fan was varying in speed under load. Then finally blew my vehicle cigarette lighter receptacle fuse. ...


A few thoughts on this. With the transistors, if these are a darlington style of transistor, it might show a short on a good transistor. The USB "transistor" is a voltage regulator, 12v to 5volts dc. With the inverter input, some inverters use a diode in the input to protect against connecting the inverter by reversed leads. This diode might be shorted and be causing your problem. If it comes to changing the transistors, it might be cheaper in the long run to buy a new inverter. The transistors might be problematic and might not be the only thing problematic. Experience here talking!

Feb 05, 2011 | Wagan 20036 400 Watt Power Inverter Corp

1 Answer

1988 nissan sentra fuel and temp guage voltage regulator


emissionwiz is wrong.
there is a voltage LIMITER located behind you gauge cluster.
Small silver box usually 4 numbers stamped on back with three wires out of it, yellow, blue, black.

May 19, 2010 | 1988 Nissan Sentra 2 Door

1 Answer

My 2002 Troy Bilt 18 hp garden tractor has a voltage spike which burns out the light headlight bulbs. Actually, we received this tractor as a donation for sale at a charity auction. It needed a few repairs...


Locate and replace the voltage rectifier this is a voltage limiter than can go bad, trace the wire that comes out of the motor's shroud it should go to a small box that then has a wire that leads to the battery this small box will be the voltage regulator or rectifier they are similar devices, replacing this box should solve the problem however before replacing the light bulbs again after replacing the regulator or rectifier hook up a voltage regulator to the positive terminal of the battery while the tractor is running at a high rpm or engine speed, if the voltage reads higher than 14 volts the light bulbs will burn out again but this is a simplistic electrical system and the voltage rectifier or regulator restricts the voltage from exceeding 14 volts so replacing it should do the trick.

Oct 21, 2009 | Garden

1 Answer

2002 sonata 2.4l battery dash light on. replaced alternator. Still not charging


I don't know if your car has an integrated regulator or not; some house the regulator in a section of the alternator case, others mount it remote from it. The regulator monitors the load and battery voltag,e primitively but effectively, and controls the current flowing through the field winding of the alternator to ground, changing the magnetic field intensity and consequently the voltage output of the alternator. The 'hot' end of the field is internally connected to the + output, the 'cold' end is controlled by a transistor inside the regulator which, in turn, is controlled by circuitry monitoring the system voltage.     Some alternators can be tested by sticking a wire through a specified opening, actually shorting the controlled end of the field to ground briefly, while monitoring the voltage across the battery, doing this though for seconds only. This essentially bypasses a suspected defective regulator; this causes the output voltage to rise instantly to its maximum of ~17 volts if the alternator is OK.
I don't recommend poking a wire at random into an available opening so having a service manual (Haynes-Chilton) would be nearly mandatory.

Sep 27, 2008 | Hyundai Motor 2002 Sonata

1 Answer

Fuse blows, Disney DTD1363


It look like this is the PN p5nk50zfp.
This site has your part. Data sheet
This part, it might be your voltage regulator not the horizontal output transistor.
Good Luck.

Mar 12, 2008 | Disney DTD1363-CAR 13" TV/DVD

5 Answers

Cassette Player


Motor speed needs to be regulated by PWM. Reducing the current (with a resistor) actually lowers the torque - which, with a given load, does result in reduced speed - however, different length tapes (60min vs 90min), as well as different quality, and even current position in the tape, will change the load and hence the speed. You need to regulate the speed via PWM. It's sometimes done on a small board built into the motor, in which case you'd have a round hole into which you could insert an INSULATED screwdriver (tiny flathead wrapped most of the way in electrical tape works). It may be done on the main board, in which case you could find a pot conveniently labeled "motor speed", or perhaps "pulse width" or "pwm" or something to that effect. Find it, mark its current position just in case, and turn it to see if it gets the effect you're after. And there are some tape decks in the world with no speed adjust - they are designed with a specific speed motor and the sizes of the wheels and gears are calculated for that speed. Also there may be a mechanical fault/malfunction causing the speed problem. An initial check and thorough cleaning of the capstan and pinch roller should be done. If there is a buildup of tape oxide or a piece of a broken tape wrapped around the capstan, the tape travel will be too fast (do to the effective increase in capstan shaft diameter). If the pinch roller isn't fully engaging, the tape can be getting pulled onto the takeup spool at a speed faster than the capstan control. A different source of trouble might be a slip clutch (possibly an idler/clutch assembly)which is binding, or otherwise not functioning the way it should. Another type of motor doesn't have it's speed controlled by an internal or external voltage.. instead, the motor has an internal centrifugal speed controller. This type of motor can be found on older tape decks, and might not have been utilized more recently. Good luck

Mar 07, 2006 | GPX HMTU3234 Shelf System

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