Section 7 Audio Alignment
7 - 2
May 1992
MX-5050 Operation and Maintenance Manual
7.1 Tools and Equipment Required
• Alignment Tapes suitable for the tape speed most often used. Otari
recommends the following Alignment Tapes.
Tape Speed Flux Level MRL* Catalog No.
15 ips 250 nWb/m 21J205 (NAB)
320 nWb/m 21J303 (IEC)
7.5 ips 250 nWb/m 21T204 (NAB)
320 NWb/m 21T302 (IEC)
3.75ips 200 nWb/m 21F101A (NAB, IEC)
* Magnetic Reference Laboratories
• An AC voltmeter calibrated in millivolts and decibels, having a high enough
input impedance so as not to load down the circuit under test, and able to
display dBm (0dBm = 0.775V)
• A general purpose dual-trace oscilloscope such as those made by Tektronics,
Leader, Hitachi and Hewlett Packard.
• A sweepable test oscillator capable of generating sine waves at frequencies
from 20 Hz to 20 kHz at +4 dBm (or whatever standard operating level is
used, e.g., –10 dBm or +6 dBm).
• A reel of tape of the type normally used for sessions.
• Hand Tools.
• A non-magnetic alignment screwdriver with a blade small enough to fit the
trimmers on the PCB Assemblies.
• A tape head demagnetizer (degausser).
• Pure (90%) isopropyl alcohol, cotton swabs, and lint-free cloth for cleaning
the tape path.
CAUTION:
Do not use rubbing alcohol
, as this can leave water and oil
residues, and
do not use any other solvent
, as it may delaminate the heads.
Table 7-1
Reference Tapes
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