NEC VT670 Blown Fuse

Scott, I have the exact same problem. What ended up fixing this? Thanks! - Paul

It sure sounds like a fuse may have blown, although the cigarette lighter fuse in most cars does not control the radio, and should have been able to handle the car charger without blowing. Take the lid off the fuse box, either under the hood or inside the car under the dash on the right side or left side of the car, and look for a blown fuse. Usually you can tell if they are blown by looking at them.....but you often have to remove them first, depending on the type of fuse used in your car. The inside of the lid may have a chart that shows which fuse controls the radio.
Good luck,
genetuck

Check the area where the fuse was...it's usually marked on the board or next to the fuse holder. Check the size also, 2 types 5x20mm or 1/4x1 1/4 in. Usually slow blow.

You can try a slow blow fuse, but more than likely there is some other issue in the unit that is drawing too much current. By no means would you want to increase the amperage of the fuse. it could cause a fire.

Yes Its on the rotary pwb. Its behind the IOT pwb. Basically at the top left hand corner as you look at the rear of the machine. I think it is a 3 amp slow blow but cant quite remember. Definately slow blow though. Sometimes if you meter them they can read ok but as soon as a load is passed through them the fuse cant hold the charge and fails. It is the 2 fuses that are harder to get at, may as well change all 3 whilst your there. The rating for the fuse is written on them. Worst case is the developer motor has seized, taking it off an putting it back on again usually remedies this, but its a bit more awkward to get to. Fuses first

I used a slow blow fuse. The blown one looked like it was a slow blow - there was quite a bit of material in it - but it was hard to tell because it was blown.

Depending upon the way in which the lamp finally smoked, it is not unusual for the feeder fuse to blow. Replace the fuse and try the projector. As long as you haev a new lamp, it should work OK.

Dan

Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.

80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also

You probably need the motor conversion kit 12002039. This Neptune motor / motor control board has a high failure rate. To determine this you need to remove the front cover and inspect the motor control board near the floor on right side for burnt components or a blown 10 amp fuse. If you have burnt components or a blown fuse then your motor control board has failed and needs to be replaced. See www.neptunewaxmotor.com for Neptune disassembly pictures and other neptune information.

The main fuse should be a 4 amp fuse not a 1.25 amp.