We have plugged it in and the power will not come on after we push the button on. This unit comes in four pieces. Stero & amplifier, tuner & sound processor, stero cassette deck, compack disk changer 1994. We have power up to the amplifier.
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Re: We can't get the power to come on.
Make sure that everything is plug into the right spot. If the amp comes on and nothing else, I will check the power cords. Also check the power buttons for each unit and make sure they are on. Also listen for a click sound from the amp when you turn it on. You will here it about 2 to 7 seconds after you turn it on with the main power button. If you do not here it, then you have a problem with the amp. One of the channels is bad and you will need to take to a repair shop for repair.
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The problem is with the "power on" relay (RL841) located on the power supply board. Unplug the unit and take off the side panel and top cover. Remove the screws to remove the CD changer. There is a small black rectangular relay just below where the AC cord is soldered onto the PC board. Carefully remove (actually break it off carefully and gently & throw away) the plastic top housing of the relay. Plug in the unit and with a pencil or stick, manually actuate the coil armature while pressing the power on button on the front of the unit. I can almost assure you your unit will return to normal operation. Put it all back together and you're done. The blinking red 4 times followed by a long pulse indicates a power failure. The start up capacitor had drained and couldn't provide enough voltage to pull the relay coil in all the way.
If your handy you gots ta open this thing up and replace the bad capacitor (hint-its the little cylindrical thing thats got burnt smoke on it) on the IC board. Also, check for a short while your in there.
According to Page 46 of the LBT-W5000 Operating Instructions:
"The display stars flashing as soon as you plug in the power cord even though you haven't turned on the system (demonstration mode).
Press DISPLAY (for LBT-W5000 / W300 / XB700 / XB500) or DEMO (STANDBY) (for other models) while the system is off. If the system is in the Power Saving mode, press POWER SAVE / DEMO (STANDBY) (for LBT-W5000 / W300 / XB700 / XB500).
The demonstration appears automatically the first time you plug in the power cord, or if there is a power outage lasting longer than half a day."
I tested this today, as my LBT-W5000 was in Demonstration Mode. It definitely works. The only catch is (at least on the W5000), and it's a minor one, you have to reset your clock afterwards.
when you switch the unit on make sure that you hear two clicks, this will tell you whether the protection relay is working. Should you hear the two clicks this will indicate that the audio ic`s are working. There are fuses inside the main component box, four on the transformer. Let me know the outcome
It's a bit after Jim's post, however I had what appears to have been the same problem with my LX770 after it had been stored in the loft for quite a few years.
I found the problem to be caused by the tone arm mechanisms stalling - The band that was associated with lifting the arm had turned to a black gunge and was not allowing the motor to rotate, also the motor associated with moving the arm backwards and forwards was struggling to turn.
I cleaned the tone lifting pulleys and replaced with a small elastic band (for a temporary fix). This was a little fiddly as you have to take off a spring and a couple of gears to get the new band in place. I cleaned the runners and cleaned off the grease on the worm gears associated with the arm tracking (as I suspected it may be more viscus than originally installed), lightly oiled the tone arm tracking gears. It still seamed to take an amount of helping the tracking arm gears until they were able to move freely. With the tone arm mechanisms working properly the whole unit now seams to be working.
Top tips if you attempt this:
WARNING - If the unit is plugged in, the transformer and high voltage wires are live regardless of whether the on button is on or off on the front of the record deck. PLEASE do not take any of my comments as recommendation you should ever do anything with the unit plugged in!
Remove the little stylus carrier before you start taking the player to pieces - saves damaging it!
Remove the record mat and aluminium platter before turning the unit upside down.
Manually push the tone arm to about 0.5cm from its furthest travel - so you can remove the tone arm mechanism plate. May be a little stiff as the wires have to slide of the pulleys for the tone arm to be pushed.
To access the tone arm mechanisms, remove the main bottom plate (and greasy spring), then undo the screws which hold on the rear undertray. With the decks buttons toward you, you should then be able to lift the rear tray slightly and tilt the tray towards you to expose the tone arm mechanisms.
You shouldn't need to remove the circuit board with the control buttons on the front of the unit.
After getting it going, I found that I needed a Phono preamp to get the signal strength necessary to use the deck for transferring vinyl to my PC.
I know I'm finding lots of old posts about this JVC model MX-KB30 "PROTECT" problem but - I FIXED IT!!!!
Daugter had the same difficulty after a series of power outages.
Figured it had something to do with the speaker circuit board. Decided to look for a reset on the board itself. Not sure that I found one, basically becuase there was not a perception of a button pressing down, but the "PROTECT" cleared and the sound is coming through the speakers again. The sterio works fine.
First - as when working on all electronics - unplug the unit and make sure all static electricity has been discharged before working on it. You will need a small jewlers philips screw driver as well as a mirror for looking down on top of the electrical components.
Remove the cover of the sterio surrounding the sides and top of the unit - there are screws on the sides, top and around the edges of the back fo the unit related to this piece. You do not have to remove any other pieces.
There will be a circuit board attached to the back center of the unit that has a black cable running to the headphone plug and the speaker connections are also running through this board.
If you face the front of the unit, looking at the sound circuit board from the right side, there will be a small black - square looking - voltage regulator (I think that's what it is anyway) that you will see some voltage information and some switch setting pictographs (along with the numbers 1, 2, 3).
On top of this black unit (here is where you need the mirror) there is a square hole that looks down inside this unit as well as a round hole that you will see white plastic inside.
Using the jewlers screwdriver, carefully press on the white plastic once or twice (I couldn't tell that it had pushed down) particularly becuase I have no clue how sturdy this piece is.
With the cover still off the unit, plug it in and make sure the "PROTECT" message has disappeared and the speakers are working again.
That's exactly what I did and the darn thing started working again.
Maybe I just got lucky, but this is a nice sounding unit and it would be a shame to see folks toss it away for such a simple fix if that is indeed what did it.