setup

  • Thread starter Thread starter FALKEN
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FALKEN

FALKEN

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i felt like i was hijacking too bad so i started a new thread. I ran into a problem.

First I did MCI2424's azimuth test and everrything looked good. Then I followed the instructions in the manual. I am trying to set up my machine for 456 and I have a 355 nwb/m tape. So, I think I need to be referencing the tape playback to +3 db on the VU meters, which I think is .446 volts.

So I have adjusted the tape playback to read .446 on both channels on both the sync and repro heads. I then adjusted my meters to read +3 on the same playback. This was all with the 1khz tone. I then adjusted the repro and sync playback eq to +3 on the VUs using the 10k tone.

The next part is where I got stuck. I am sending a tone out of my PC to check the input level calibration. The manual says to use 400 hz but I have tried 400 hz and 1khz with the same results. I have measured the tone coming out of my soundcard to be at .3 volts. When I input it to either channel of the machine, set to monitor the inputs, both channels read 0 on the VU's. perfect. The L output also reads .3 V as it should. But the R output is reading closer to .4 V (about a 2 db difference)

The manual had said to set the input level by either looking at the VU's OR checking the output voltage. The first one is working and the second one isn't. so I am concerned something is off. I went back and started all over again and everything is the same. and I did start off by cleaning and demagging so I can't think of the problem.
 
ok I think I might have worked out all of that and now I am on the bias traps. the manual says to connect the + side of the multimeter to the test point and the - side to ground. Then to adjust the inductor for a minimum reading.

well, no matter what I do and how I adjust that inductor; nothing happens on the multimeter.

any help??
 
You’re setting up your 32, right?

If you have a 355 nWb/m MRL tape, then yes your VU should read +3 @ 1kHz, if you’re going for the factory flux level of 250 nWb/m for 456 tape.

Never mind the voltage reading at the output, just use the VU meters. No mater what flux level you choose, your reference output voltage (line level) should always end up at –10 (0.316 volts).

The magnetic flux level and electrical line level are independent of each other.
 
ok, I think I got that. only some of the adjustments didnt affect the VU meters at all and I had to go with what the outputs are saying.

But I think I am past all that.

The only thing I can't figure out are these dang bias traps.
 
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