Sony BM1-47 i have recorded four channels on BM 246. I know that all four channels recorded properly, but when i try to transcribe it on my BM-146 channel 3 is not working.

Hello,

No, this unit does not have an erase feature. You would need a magnetict tape eraser such as a BE10.

While holding the erase button down, press rewind.

Hello you can get one at http://www.tvps.com/Products/SONY-BM-147-Four-Track-Transcriber---Pre-Owned-BM147__SO-P-BM-147.aspx also you can send your unit to have repair to Send an email to service@tvps.com or call (800) 644-9525. Please indicate model, serial and detailed description of problem Good Luck

Hello I can be two possible problem your unit has a bad head or it needs a new pinch roller you can send your unit to service at Send an email to service@tvps.com or call (800) 644-9525. Please indicate model, serial and detailed description of problem or you may get a spare is on sale and is complete you end having extra parts and the unit has warranty http://www.tvps.com/Products/SONY-BM-850T-Micro-Cassette-Transcriber---Pre-Owned__SO-P-BM-850-T.aspx

Hello the reason is you have set as Dictator Press and hold Stop and Reset for more than 2 seconds when your dispay change and show 000 your unit is ready to transcribe your auto back space it will work Normally

Hello on the right side of unit is a switch for transcribe make sure is on the on position you are going to see on Deck A only lines on display, put your tape on Deck B is the only side that transcribes if the pedal does not respond you probably have a broken pedal here is one in a great price
http://www.tvps.com/Products/ECS-Sony-IN-75-Heavy-Duty-Foot-Pedal---Pre-Owned__ECS-PIN-75.aspx
Or if you feel better to send unit to service try this.
Send an email to service@tvps.com or call (800) 644-9525. Please indicate model, serial and detailed description of problem

Hello just get a really cheap foot pedal replacement at http://www.tvps.com/Products/ECS-Sony-IN-75-Heavy-Duty-Foot-Pedal---Pre-Owned__ECS-PIN-75.aspx

If there is no sound on a channel, and you know the recording is there, then you either have a bad head or a broken wire at the tape head.

This is a common symptom when the belt and pinch roller wear out. They will both need replacement.

I have a Soney Transcriber BM-840. 'When I press the erase/rewinder buttons, the tape IS NOT erased. What am I doing wrong?