Revox C270 Time Code Bedienungsanleitung Seite 14

RACOX
7. Timecode REC/PB head alignement procedure
(see fig. 1...4)
Mechanical alignment
As indicated on Fig. 3 check the head azimuth, front and profile (a+ b). The tape-to-head contact should
make a right angle with the dotted line (c).
Note, the mechanical alignment
Testing the mechanical alignment
Clean and degauss the heads as well as the tape guide elements.
Use the TC playback alignment tape, order no. 46015.
Connect the oscilloscope probe to TP8 (Pin 1 IC U4A) located on the TC analogue circuit PCB
1.777.101.02.
Offset the tape slightly up and down manually. If any level gain is achieved, the mechanical
alignment must be rechecked. A reading of approx. 800 mV should be achieved.
NMe: In order to guarantee
chine we recommend the following test method:
Install a new, unrecorded
Select tape speed 15ips.
Hook up a square-wave generator 2Vpp, 1kHz, to all three line inputs and perform a recording of
approximately 10 to 20 seconds duration.
spray iron oxide (MAGNETIC IRON OXIDE made by AEROSOLS INTERNATIONAL LTD., Part No.
46016) onto a few centimeters
After the layer has dried measure the symmetry of the tracks with the aid of a measuring magni-
fier (Part No. 46017). Correct the azimuth of the head if the deviation exceeds +/-O,05mm.
Repeat recording and measurement until the specified symmetry is obtained.
is very critical since the TC head has a track width of only 0.35 mm.
a safe reading of TC encoded tapes recorded
tape.
of the recorded tape, coated side facing up.
10
on a different ma-