My Njoe Tjoeb has no output. The tubes do not light up. The display is on.
You have a blown fuse. Find the small circuit board next to the power transformers. On that board is a fuse under a plastic cover. Remove the fuse and replace with the same value fuse. For North American players (120v), the fuse value us 500mA (milliamp) slow blow. For 220v players, the fuse value is 250mA slow blow. Even if the fuse looks good, it may still be bad. The way to know for sure is to use a multimeter to check continuity. Do that by touching one multimeter lead to one end of the fuse, and the other lead to the other end. If your multimeter does not give you a reading, the fuse is blown.
My Njoe Tjoeb has no output. The tubes light up and the disc is spinning. I do have the upsampler.
Just because this has happened ... before you go any further, make sure the volume control on your Njoe Tjoeb is at "VOL MAX."
Your upsampler may be bad. Remove the upsampler and re-install the stock DAC and op amps. Refer to the picture on the left to see the proper position and orientation of each chip. It is VERY important that you install the chips just as you see in the picture!
If you install the chips correctly, and the player now is giving you output, that means the upsampler is defective.
If you still have no output, or if you do not have the upsampler, double check the position and orientation of each chip to make sure they are seated in the socket correctly. Check all cables make sure they are securely connected to the output
board. If you have done all that and still get no output, you may need a new output board.
