Section 7 Audio Alignment
7 - 8
May 1992
MX-5050 Operation and Maintenance Manual
7.4 Record Electronics Adjustments
7.4.1 Record Bias Level Adjustment
1. Thread the machine with the tape normally used for sessions.
2. Press down the RECORD READY button to the READY position and set the
Monitor button to SOURCE position. Set the SPEED HI/LO switch to the Hi
position.
3. Set the OSC FREQ button on the Amplifier Panel to 10 kHz position.
4. Adjust the Input Level Control knob so that the VU meter indicates –10VU
(–20VU for 7.5 ips).
5. Press the PLAY and RECORD buttons simultaneously to place the machine in
Record mode, and press down the Monitor button to TAPE position.
6. Turn VR306 fully counterclockwise. While observing the CH 1VU meter, turn
VR306 clockwise until a peak in the indication on the VU meter is observed.
7. Continue turning VR306 clockwise until a decrease equal to the selected
Overbias amount is observed. Refer to Table 7-2 for Overbias amounts for
various tape types.
8. Repeat Steps 5 through 7 for 2 channel using VR406.
Table 7-3
Overbias Values (dB)
MKIV-2, MKIV-2E, BIII2, BIII-2E
Tape Speed (ips) 3.75 7.5 15
Frequency (Hz) 10 k 10 k 10 k
AGFA PEM 468 8.0 5.0 3.0
AGFA PEM 469 8.0 5.5 3.5
AMPEX 406/407 7.0 4.5 2.7
AMPEX 456 8.0 5.5 3.0
BASF LGR50P 7.5 5.5 3.5
BASF SM911 8.0 5.0 3.0
SCOTCH 206/207 7.0 4.5 2.7
SCOTCH 226/227 8.0 5.0 3.0
Unit: dB
BIII-F
Tape Speed (ips) 7.5 15
Frequency (Hz) 10 k 10 k
AGFA 469 3.5 2
AMPEX 456 3.5 2
SCOTCH 2265.0 3.5 2
Unit: dB
To Next Page
Loading...
