Question about JVC XL-F254BK 5-Disc CD Changer

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Solution for no power

Check the means transformer, resistors in that power park stage mostly low resistant value (open circut).,power regulator ,sound ic it can block the flow of current (shorting the circut).

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I got no power . I have power at outlet

rectifier bridge, transformer , fuse (resistor) or a soledring failure of an active component most the ones on a heatsink thats only loose


Mar 15, 2016 | CD Players

1 Answer

Jvc vcr/dvd recoroder dr-mvis

No power, No Display - test voltages on secondary side of transformer were pulsating
Check diodes 6230, 6240, 6210. They are BYW98 Rectifiers, in my case it was s/c. Thanks to Sparky for similar tip - Philips CD Model: CDR770/00
No power and no output
Replace C6 with 4.7uF, 250v
No power, voltages on secondary side of chopper were very low and pulsating
Check diode 6230. It's a BYW98, in my case it was s/c. Note: it's the rectifier for the 14v line
Dead, no power up on pin 2 of ic601
Replace x601 on main processor ic601
(Brko) Toshiba DVD Model: SD-1750 / SD-2800
No sound
Replaced C927 / C928
No power, No Display - test voltages on secondary side of transformer were pulsating
Check diodes 6230, 6240, 6210. They are BYW98 Rectifiers, in my case it was s/c. Thanks to Sparky for similar tip - Philips CD Model: CDR770/00

Nov 26, 2007 | CD Players

2 Answers

Display light for totals on cyclone pin ball machine don't display

Assuming the game is playing, but just no displays lit.

1. Check fuses on power supply board for a blown fuse. Sometimes the fuse clips will crack and not provide a snug hold to the fuse.

2. Look for bad (cracked) solder joints on the connector pins on power supply board.

3. There are two 39K resistors on the power supply board that go bad (usually go open circuit). One of those resistors is for the +100 volts and the other one is for the -100 volts. All it takes is one of those resistors to go bad and the displays will be blank. Originals were rated at a half watt, but it is suggested to replace with a higher wattage value, say 39k at 2 watts. If you find only one bad 39k resistor, replace the other one too at the same time because that one will soon fail.

May 29, 2014 | Wurlitzer Jukebox CD Player

2 Answers

No power on my cdj 200

Check if there is a fuse inside of it that is (Blowin) If you can,t find a fuse in it , Trow it out end just go end buy a different one, It will cost you less then to have it repaired,

Nov 27, 2012 | Pioneer CDJ-200 CD Player

1 Answer

Rowe r92 sound problem

Moving the wire indicates the speakers are OK. Try reversing the 3 pin plug from the cartridge. If the problem stays on the same channel, it is probably a preamp board issue. If the problem switches channels, you have a bad wire to the cartridge or a bad cartridge.

Nov 16, 2011 | CD Players

1 Answer

Give me @ LEAST THREE problems of CURRENT DIVISION THEOREM with solution

a 30 ohms resistor is connected in parallel with a variable resistance R. The parallel combination is connected in series with a 6 ohms resistoe and connected across 120 volts source, find the minimum value of R, if the power taken by R is equal to the power taken by the 6 ohms resistor.

Mar 04, 2011 | Shanling CDT-100

1 Answer

Dead Arcam CD73

Hi 2002tii

These are a cool old machine. They use the cdm1 laser mechanism that was revered in its day for high performance. If you have voltage available after the rectifier stages, check the 3 pin voltage regulators. Marked as 78xx for positive regulator, and 79xx for negative. the xx gives you the voltage they are supposed to be putting out. They commonly fail, also check the same for dry solder joint. resolder them anyway if you are unsure. If all the regulators check out, then also check low value flame proof resistors in the power supply rails. Get back to me here again and let me know how you got on. Good Luck


Aug 07, 2008 | CD Players

1 Answer

Philips CDR 795 Power Supply Problem

I don't know what you are using to check the caps but in order to find the culprits, it's almost mandatory to have an instrument that will measure both capacitance and dissipation factor (DF) since that is what is killing most of our modern electronics.
If you don't find any caps pregnant or leaking deposits and plan on shotgunning it, I'd start with those with values between 4.7 & 100uFd as these are the most common failures and mostly in feedback paths and are lower voltages.
You can buy them at Mouser Electronics with no minimum charge and 'at cost' shipping.  
Good luck-

Mar 29, 2008 | Philips CDR795 2-Disc CD Recorder

1 Answer

Power transformer problem

You need the service manual for those values. A quick google search shows it costs more than the replacement transformer!

But that is for the 110v version @$21. The same company sells the service manual @$24 or just keep googling.

Jan 24, 2008 | CD Players

1 Answer

How do I replace a damaged power supply transformer on a DN-600F ?

Hello there. i'll suggest you one quick solution but it maybe dangerous!(Do it the greek way :P) try to remove the transformer from the machine. Take one Ohm meter and measure the resistance of the 120 vac coil. IF THERE IS NOT ANY (i mean that the ohm meter shows nothing diferent than not using it) get a paper blade and start removing the paper cover that it has rounded from the place where the 120 vac wires goes. you will see there that there is a mini thermal fuse.short circuit the thermal fuse and try to measure again the resistance of the 120 vac coil. if you see something between 40 and 80 ohms you are ok. Now that you haven't got any thermal fuse on your transformer just increase your security putting on a 300 mA fuse at the 120vac coil. I have done it with many hard to find transformers and it worked for me.Just be sure that when you plug it on, you will not touch it because i don't know if you are gonna do it right.ok? (say ok!) That was the second solution to your problem. The first and the safest is to go to your local dealer and order a new transformer.

Oct 12, 2006 | Denon DN-600F CD Player

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