OTARI MX-5050 BIII-2 - Audio Alignment; 7.1 Tools and Equipment Required

7. Audio Alignment
REP
COM. REP MODE
FROM
REC HEAD
SEL·REP
AMP
MIC ACTIVE
BAL. AMP
EQ AMP
COM. EQ SEL
EQ VR
LOW COMP
LOW COMP
ADJ
COM.
CUE ATT
OUTPUT LEVEL ADJ
NORMAL
SRL
TAPE
SOURCE
PEAK AMP
LINE OUT
AMP
VU AMP
PHONE
AMP
ACTIVE
BAL. AMP
VU
LINE OUT
REC
REC SEL
TO SEL-REP
AMP
ERASE
REC SEL
REC OUT
AMP
COM.
EQ SEL
BIAS ADJ
BIAS OSC
REC SEL
COM. REC
REC LEVEL SEL
REC PRE
AMP
TEST OSC
1K10K
COM TEST OSC
LINE LEVEL
ADJ
LINE IN
AMP
LINE IN
MIC IN
MIC GAIN
SEL
MIC LEVEL
ADJ
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 = 0.775 V)
• 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.
MX-5050mkIV-2/BIII-2 Operation and Maintenance Manual
44 1999-02