AG-7750 Audio Dub?
03-Sep-93 16:06:17
Sb: #55985-AG-7750 Audio Dub?
Fm: Fred W. Heidingsfelder 76556,744
To: neil lockhart 72144,656
Neil,
A couple of things to be aware of with the audio on the AG7750. First is
there audio getting into the machine. You can check this by the movement
of the needles. Sounds simple, but you would be surprised. If you don't
see the neddles move, try pushing in the record button, you don't need to
push the play at this point. If there is still no movement and you know
that you have a source hooked in, check the meter switch on the front and
see if it is set to HI-FI or normal. To dub audio onto a tape the audio
will have to be coming in through the normal channels. Next check the
volume levels via the controls under the meters, if you have turned them up
the whole way and still get no meter deflection go around to the back of
the machine.
Which set of jacks is the source plugged into. The left set is the input
of preference. You can record on either HI-FI or Normal through these
jacks. If indeed you are plugged in here, check the switch above the
jacks. These switches govern the input level for the source you are using.
It seems Sony and Panasonic differ on the exact numbers here but generally
speaking the -??dB number is for a mike or low pressure source, the -20dB
or 0dB position is for a line level source and the +4dB is for an amplified
source. If you are on the +4dB position turn down the volume knob on the
front and flip this switch to the 0dB position and then sneak the volume
back up. Still no audio, turn it down again and switch to the -6dB
position. and then try turning it up again. If you still don't have neddle
deflection, check your source again.
Still no needle deflection? The machine expects a balanced input through
the XLR plug. If you are making a cord to step from an unbalanced source
to a balanced input, did you wire it right? I can't remember right now
which is which but I can find out if necessary. The more simple approach
is to buy a matching transformer from Radio Shack.
Okay, you already had neddle deflection, "I can hear the music through the
speakers I hooked up to the audio monitor jack." –Do you have a record
tab in the tape you are using.– Don't laugh, I've done this, put a tape
in the machine set up an elaborate edit pushed the red button and watched
the event happen on the program monitor and played it back from the record
deck, only to find nothing is on the tape. If an edit doesn't take and it
should always check the record tab.
Check the switch in the "Pocket Area" over in the time code section and see
if it is the Audio CH2 position or the LTC position. If it is in the LTC
position you will here a high whine on the channel two side. But that only
takes care of Channel 2, channel one should be alright.
If all of this fails, put a new tape in the machine with a record tab in
place, feed the machine some video, a TGA on the frame buffer will do fine
and send some audio that makes the neddles move, make sure that the HI-FI
Rec switch, in the pocket area, is in the on position and the neddles move
with the meter switch in either position, and then perform a crash edit,
(push the record and play buttons together.)
Now when you play this tape back you should see the neddles move and hear
the same sound you recorded, If not, try turniong up the volume controls
on the front of the machine, under the meters. I forget right now but
sometimes when there is only a single knob it is both a volume control for
input as well as output. Still no sound or neddle deflection? Call your
dealer and have him/her come to your place and check it out.
Good Luck
Fred