SONY uvw 1800 Error Code 02-454

Error 91-125 on a Beta SP UVW 1800 is a diagnostic code indicating a problem with the audio channel 1 input. The error message "appears like a feedback on audio channel 1" suggests that there is a signal present on audio channel 1 even though nothing is connected to it. This could be caused by a malfunctioning input or a problem with the internal signal routing.
Here are some steps you can try to troubleshoot this issue:

1. Check all audio inputs and outputs to ensure that nothing is connected to audio channel 1.
2. Disconnect all cables from the Beta SP UVW 1800 and power it off. Wait for a few minutes and then power it back on.
3. Check the audio routing settings in the menu of the Beta SP UVW 1800 to ensure that audio channel 1 is not being routed to an unexpected location.
4. Inspect the audio channel 1 input for any damage or corrosion.
5. Try a different audio cable or input device to rule out any issues with the current cable or device.
6. Check the manual of the Beta SP UVW 1800 for any specific troubleshooting steps.

If none of the above steps resolve the issue, it may be a hardware issue and you may need to contact the manufacturer for further assistance. It could be a malfunction in the audio channel 1 input circuit or a problem with the internal signal routing. A qualified technician should be able to diagnose and repair the problem.

02-674 - Failed to detect the T reel FG during PLAY and REC. No signal from the Hall sensor

078 Detected an abnormal current in the T reel motor.

I found a site where the error code are.
http://z.baidu.com/question/97641503.html
02-274 Failed to detect the T reel FG during threadingI hope this helps

UVW-1800 error 02-694 indicates a problem with one or both reel motors. check the cables going to both motors; have seen failures related to these cables.

02-874 error code signifies a defective takeup reel. The reel is not winding the tape in, so the deck won't go through the eject procedure. Check the connection to the takeup reel motor; if that's OK, the motor itself may be bad. Rarely, the takeup reel motor assembly will need to be replaced; usually it's a connection problem.

Both these error codes indicate a problem with the supply reel motor.
The first code (02-058) indicates that the reel motor is drawing too much current, which could be caused by a bad motor, defective driver circuit, or even a bad tape. The second code (02-803) indicates tape slack, caused by the defective supply reel motor. FIRST thing to check would be a possible bad tape. Try different tapes and see if the problem persists. If it does, it may be time to find a technician.

I just found this post on another site :
tsvservice- 29th Jun 2007 14:0109-221 is "failure to complete threading within the specified time". in plain talk, the mechanism in the deck that threads the tape around the heads is not working. this could be a bad motor, bad gear, or even a bad tape.

error code 02-395 points to a problem with one or both reel motors. a good technician should be able to fix this easily.

The probem as told on another site (sorry, can't remember to give proper credit) is that the pinch roller is not making contact with the capstan. THis is exacly what happened to my 1800 after sitting for a long time with no use. THe solution was to manually excersize the lever going to the solenoid to unstick the mechanism. Then, voila, pinch roller pinches, tape moves, UVW1800 happy again.