Hey,
I finally found the time to clean and setup a broken 464. I replaced the Gear C, cleaned the entire machine, and assembled it back together.
Now I noticed, when I play my test tape, that channel 1 is showing a very low signal in the display (1 bar or none), while channels 2 to 4 are more or less fine. Then I tried to adjust the trim pot for channel one on the board (PB Level) and noticed a slight change in volume by hearing - but no considerable change on the meter. I tested the rec input (unbalanced) with a test signal, same thing: the level is lower then the others, although I can hear just a little difference in the headphones. Tried to adjust the rec trimpot on the board, no noticeable change. Is this a faulty meter? I can not say if this behavior existed before my cleaning efford, due to the fact, that it didn't work at all cause gear C was broken. Does anyone know where to look further to troubleshoot this?
I looked into the board for faulty capacitors or any signs of failure, checked the inside connection wires and connectors, demagnetized and cleaned the playback/record head, dbx and sync is turned off - nothing that seems to cause this behavior.
Any help appreciated, thx
T.
I finally found the time to clean and setup a broken 464. I replaced the Gear C, cleaned the entire machine, and assembled it back together.
Now I noticed, when I play my test tape, that channel 1 is showing a very low signal in the display (1 bar or none), while channels 2 to 4 are more or less fine. Then I tried to adjust the trim pot for channel one on the board (PB Level) and noticed a slight change in volume by hearing - but no considerable change on the meter. I tested the rec input (unbalanced) with a test signal, same thing: the level is lower then the others, although I can hear just a little difference in the headphones. Tried to adjust the rec trimpot on the board, no noticeable change. Is this a faulty meter? I can not say if this behavior existed before my cleaning efford, due to the fact, that it didn't work at all cause gear C was broken. Does anyone know where to look further to troubleshoot this?
I looked into the board for faulty capacitors or any signs of failure, checked the inside connection wires and connectors, demagnetized and cleaned the playback/record head, dbx and sync is turned off - nothing that seems to cause this behavior.
Any help appreciated, thx
T.