Hi
The right channel of my recorder has a very muffled sound, when I play back after recording. I was advise to recalibrate the machine. Referring to the manual, before using the Calibration tape, some pre-alignments have to be done. The erase current and bias pre-adjustment is to be done using a blank tape. After loading the blank tape put it into record mode and set R139 to a minimum, then adjust TP4 to a minimum by adjusting T3. Next adjust TP3 to 44V by adjusting R139 (The maximum voltage I can get is 6.8V). The bias preadjustment is done by setting TP6 to a minimum by adjusting L3. This was done. The bias trap was set by adjusting the bias to get the highest output reading, then increasing until it begins to fall. After taking the difference between this 2 reading, then set an overbias using the difference in reading. After doing this , I tried doing a recording. All this preadjustments were done only on the right channel. When playing back the recording, I realise that the right channel still sound muffled at the beginning, but approx 3 minutes later the right channel suddenly went up in level and clearity increased tremendously. The 6DB red indicator comes on. It becomes more louder and clearer than the left channel. I tried recording again and the same thing happens again. Approx after 3mins, the sound improves tremendously. The time delay of 3 mins seems to be constant. I do not know why this is happenning. Can some one help me out with this. What could have gone wrong.
Thanks
Carlos
The right channel of my recorder has a very muffled sound, when I play back after recording. I was advise to recalibrate the machine. Referring to the manual, before using the Calibration tape, some pre-alignments have to be done. The erase current and bias pre-adjustment is to be done using a blank tape. After loading the blank tape put it into record mode and set R139 to a minimum, then adjust TP4 to a minimum by adjusting T3. Next adjust TP3 to 44V by adjusting R139 (The maximum voltage I can get is 6.8V). The bias preadjustment is done by setting TP6 to a minimum by adjusting L3. This was done. The bias trap was set by adjusting the bias to get the highest output reading, then increasing until it begins to fall. After taking the difference between this 2 reading, then set an overbias using the difference in reading. After doing this , I tried doing a recording. All this preadjustments were done only on the right channel. When playing back the recording, I realise that the right channel still sound muffled at the beginning, but approx 3 minutes later the right channel suddenly went up in level and clearity increased tremendously. The 6DB red indicator comes on. It becomes more louder and clearer than the left channel. I tried recording again and the same thing happens again. Approx after 3mins, the sound improves tremendously. The time delay of 3 mins seems to be constant. I do not know why this is happenning. Can some one help me out with this. What could have gone wrong.
Thanks
Carlos